DP Biology Questionbank

Description

Overview of the essential ideas for this topic.

1.1: The evolution of multicellular organisms allowed cell specialization and cell replacement.

1.2: Eukaryotes have a much more complex cell structure than prokaryotes.

1.3: The structure of biological membranes makes them fluid and dynamic.

1.4: Membranes control the composition of cells by active and passive transport.

1.5: There is an unbroken chain of life from the first cells on Earth to all cells in organisms alive today.

1.6: Cell division is essential but must be controlled.

Directly related questions

• 15M.1.SL.TZ1.4: What is the structure labeled X in the electron micrograph of a rat liver cell? [Source: “0315...
• 15M.1.SL.TZ2.5: Why do multicellular organisms have emergent properties?A. They have more genes than unicellular...
• 15M.2.SL.TZ2.2b (ii): Calculate the magnification of the electron micrograph. 
• 15M.2.HL.TZ1.7a: Draw a labelled diagram to show the structure of the plasma membrane.
• 13M.1.HL.TZ2.30: In the electron photomicrographs which organelle is involved in vesicle formation?  
• 13M.1.SL.TZ1.8: What are characteristics of eukaryotic cells?  
• 13M.1.SL.TZ1.4: What happens to the surface area to volume ratio as a cell grows? A. It decreases. B. It...
• 13M.1.SL.TZ2.7: What are the parts of the cell membrane indicated in the diagram?
• 13M.3.SL.TZ2.13c: Evaluate, using the data in the bar charts, the hypothesis that aging involves loss of brain cells.
• 11M.1.HL.TZ1.5: The diagram below shows a cell during mitosis. What are the structures and stage of mitosis?
• 11M.2.HL.TZ2.6a: Outline the various stages of the cell cycle.
• 11M.1.SL.TZ2.3: Which of the following does not occur during interphase? A. Replication B. Translation C....
• 12M.1.HL.TZ2.4: The diagram shows the structure of a bacterium. What is the structure labelled X? A. Pilus B....
• 12M.1.SL.TZ2.5: What is the approximate thickness of the plasma membrane of a cell? A. 10 nm B. 50 nm C. 10 µm...
• 12M.1.SL.TZ1.3: Which features are present in prokaryotic cells? A. DNA, plasma membrane and mitochondria B....
• 12M.2.SL.TZ2.2a (ii): State the mode of transport if sodium ions move into the cell.
• 09M.2.SL.TZ1.2b: Compare prokaryotic and eukaryotic cells.
• 09M.2.SL.TZ2.2a: State the property of stem cells that makes them useful in medical treatment.
• 09M.2.SL.TZ2.7a: Draw a labelled diagram showing the ultrastructure of a typical prokaryote.
• 10M.2.HL.TZ2.2c: Describe the importance of stem cells in differentiation.
• 10M.1.SL.TZ1.6: Which events occur during the G1 phase and S phase of the cell cycle?
• 10M.2.SL.TZ1.5c: Describe the events that occur during mitosis.
• 10M.2.SL.TZ1.7c: Compare the structure of prokaryotic and eukaryotic cells.
• 12N.1.HL.TZ0.3: Which is a difference between prokaryote and eukaryote cells?
• 12N.1.SL.TZ0.5: Which process requires channel proteins? A. Simple diffusion B. Facilitated diffusion C. Binding...
• 12N.3.SL.TZ0.12b: Discuss the endosymbiotic theory for the origin of eukaryotes.
• 10N.3.SL.TZ0.10c: Compare the E. coli (Mn) and the mitochondrial dismutases.
• 10N.2.HL.TZ0.7a: Draw a labelled diagram of the ultrastructure of Escherichia coli as an example of a prokaryote.
• 09N.2.HL.TZ0.4a: Draw a labelled diagram to show the ultrastructure of Escherichia coli.
• 09N.2.HL.TZ0.4b: Distinguish between active and passive movements of materials across plasma membranes, using...
• 09N.1.SL.TZ0.4: What feature do plant cells have but not animal cells?A. Plasma membranesB. MitochondriaC. Cell...
• 16M.1.HL.TZ0.4: Which substance is used for structure in plants? A. AmylopectinB. CelluloseC. CollagenD....
• 16N.1.SL.TZ0.3: The cell membrane model proposed by Davson–Danielli was a phospholipid bilayer sandwiched between...
• 16M.3.SL.TZ0.1a: Solutions of ions, for example NaCl dissolved in water, can be used to investigate the...
• 16N.3.SL.TZ0.3b: Identify the layer of tissue found at X.
• 17M.1.SL.TZ2.3: What is a role of cholesterol in animal cells? A. It increases body fat. B. It controls...
• 17M.1.SL.TZ1.3: Which organism has DNA located in three organelles? A. A sponge B. A fern C. A flatworm D. A...
• 17N.2.SL.TZ0.06a: Describe the origin of eukaryotic cells according to the endosymbiotic theory.
• 17N.1.HL.TZ0.02: The salt concentration inside the Paramecium is 1.8 %. The salt concentration in the surrounding...
• 15M.2.HL.TZ2.3a: Outline the cell theory.
• 15M.1.HL.TZ2.3: What distinguishes prokaryotic cells from eukaryotic cells?
• 15M.1.HL.TZ2.4: What is an example of binary fission? A. Cell division in prokaryotesB. Production of haploid...
• 13M.1.HL.TZ2.4: What features of a cell favour efficient removal of waste products?
• 13M.2.SL.TZ1.2b: Describe how the structure of the membrane allows the formation of vesicles.
• 13M.2.SL.TZ2.6a: State the functions of the following organelles of a eukaryotic animal cell: lysosome, Golgi...
• 12M.1.HL.TZ2.3: What is an example of the therapeutic use of stem cells? A. Sequencing the human genome B....
• 12M.2.SL.TZ1.2c: Explain the role of protein pumps in active transport.
• 12M.2.SL.TZ2.2b: Explain facilitated diffusion.
• 12M.2.SL.TZ2.5a: Draw a labelled diagram to show the structure of membranes.
• 09M.2.HL.TZ1.3a (iii): Explain the evidence from the electron micrograph that indicates that liver cells are very active.
• 09M.2.SL.TZ1.2a: The electron micrograph below shows an E. coli cell. Identify the structures labelled A and B...
• 09M.2.SL.TZ1.6b: Outline how vesicles are used to transport materials secreted by a cell.
• 09M.1.HL.TZ2.5: What is a difference between a cell in the G1 phase and a cell in the G2 phase of the cell...
• 09M.1.SL.TZ1.7: Which of these processes require mitosis? A. Embryological development B. Reducing surface area...
• 10M.2.HL.TZ2.2a (ii): State the diameter of the pore labelled X.
• 10N.3.SL.TZ0.10e: The sequences of the two bacterial dismutases and the mitochondrial dismutase show a high degree...
• 10N.2.HL.TZ0.7b: Describe the events that occur in the four phases of mitosis in animals.
• 15N.3.SL.TZ0.12b: Discuss the evidence supporting the endosymbiotic theory for the origin of eukaryotes.
• 13N.2.SL.TZ0.2b: Explain how materials are transported within a cell between structures X and Y.
• 13N.2.HL.TZ0.7a: Draw a labelled diagram to show the molecular structure of a membrane.
• 16M.1.SL.TZ0.12: The statement relates to Pasteur’s experiments. What did this statement suggest? A. Mold...
• 17M.2.SL.TZ1.2b.i: State the function of life in Paramecium that is carried out by: cilia.
• 17M.2.HL.TZ1.5b: Outline four different functions of membrane proteins.
• 17N.1.SL.TZ0.02: What evidence from the image of Paramecium indicates whether the organism is a prokaryote or a...
• 17N.2.SL.TZ0.02a: State a reason for using an electron microscope to view this virus rather than a light microscope.
• 15M.1.SL.TZ1.6: Which events occur during both mitosis and meiosis?A. Production of haploid cells from diploid...
• 15M.1.SL.TZ2.4: What is a function of the plant cell wall?A. Formation of vesicles for transport of large...
• 15M.1.SL.TZ2.7: What is osmosis?A. The movement of water through a membrane from a low to a high solute...
• 15M.2.SL.TZ2.5b: Outline the role of proteins in active and passive transport of molecules through membranes.
• 15M.2.SL.TZ1.5a: Draw a labelled diagram of a prokaryotic cell.
• 15M.1.HL.TZ2.1: What happens to the cell surface area to volume ratio as a cell grows? A. It decreases, so...
• 15M.1.HL.TZ2.2: What is a function of the plant cell wall? A. Formation of vesicles for transport of large...
• 13M.1.HL.TZ2.3: What causes cells to differentiate? A. Sufficient nutritionB. Full expression of all genesC....
• 13M.2.SL.TZ1.2a (ii): State the process occurring at B.
• 13M.1.SL.TZ1.2: Which functions of life are carried out by all unicellular organisms?
• 13M.1.SL.TZ1.9: Which movement occurs by osmosis? A. Oxygen from alveoli into the bloodB. Water from a leaf into...
• 13M.3.SL.TZ2.13b: Compare the total synapse density of neurons in the outer and inner OB layers.
• 11M.3.SL.TZ1.11c: Outline the role of prokaryotes in the development of an oxygen-rich atmosphere on the Earth.
• 12M.1.HL.TZ1.3: Which property makes stem cells suitable for therapeutic use? A. They can divide by meiosis to...
• 12M.1.SL.TZ1.5: Which process is possible due to the fluidity of cell membranes? A. Endocytosis B. Osmosis C....
• 12M.2.SL.TZ2.5b: Explain the importance of surface area to volume ratio as a factor limiting cell size.
• 09M.1.HL.TZ1.4: How do prokaryotic cells divide? A. By mitosis B. By meiosis C. By budding D. By binary fission
• 09M.2.SL.TZ2.2b: Explain how multicellular organisms develop specialized tissues.
• 10M.2.SL.TZ2.2c: Describe the movement of water across membranes.
• 10M.1.HL.TZ2.4: What is the function of the cytoplasmic (plasma) membrane of this bacterium? A. To produce ADP...
• 11N.1.SL.TZ0.3: What is the principal mode of division for the prokaryote Escherichia coli   ? A. Endocytosis B....
• 12N.1.HL.TZ0.4: The following events occur in mitosis. X:  Attachment of spindle microtubules to centromeres ...
• 12N.2.SL.TZ0.3a (i): State the name of each phase shown, recording whether each phase has taken place at an early or...
• 12N.2.SL.TZ0.3b: State what results when there is an uncontrolled division of cells in living organisms.
• 15N.1.SL.TZ0.4: During which stage does the cell surface area to volume ratio decrease? A. Interphase B....
• 15N.1.HL.TZ0.5: What describes nuclear division in stem cells? A. Clonal selection B. Mitosis C....
• 13N.2.SL.TZ0.2a: (i) Label structures I, II, III and IV. I. II. III. IV.   (ii) State one function of...
• 13N.2.SL.TZ0.4a: (i)  State the technique used to collect cells for pre-natal...
• 13N.2.HL.TZ0.2a: Analyse this karyotype.
• 16M.3.SL.TZ0.1b: Ions move across the plasma membrane of a neuron during an action potential. The oscilloscope...
• 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
• 17M.1.SL.TZ2.2: The image shows an electron micrograph of mesophyll cells. What is the name of the structure...
• 17M.2.SL.TZ2.2b.i: State the principal product of this cell.
• 17M.2.HL.TZ2.3c: Deduce, with a reason, which red blood cell has been placed in a hypertonic solution.
• 17M.2.HL.TZ2.3b: Define osmolarity. 
• 17N.1.SL.TZ0.04: In the diagram, which structure is an intrinsic or integral protein?
• 17N.1.SL.TZ0.03: The salt concentration inside an animal cell is 1.8 %. The salt concentration in the surrounding...
• 17N.2.HL.TZ0.01d.i: Analyse the graph to obtain two conclusions about the concentration of sodium–potassium pumps.    
• 17N.3.SL.TZ0.03a: Identify the vein by labelling it with the letter V.
• 17N.3.HL.TZ0.02b.i: Calculate the actual size of the seminiferous tubule in the area indicated by the line across it,...
• 17N.1.HL.TZ0.01: Which function is accomplished by structures X and Y in the Paramecium?
• 15M.1.SL.TZ1.2: Which functions of life are carried out by all unicellular organisms?A. Response, homeostasis,...
• 15M.2.HL.TZ2.3b (ii): Calculate the magnification of the electron micrograph.
• 15M.2.HL.TZ2.8c: Following germination of seeds, plants undergo a rapid increase in the number of cells. Describe...
• 15M.3.SL.TZ2.12b: Discuss the endosymbiotic theory for the origin of eukaryotes.
• 13M.2.HL.TZ1.2a (i): State the name of organelle A.
• 13M.2.HL.TZ1.2a (ii): State the process occurring at B.
• 13M.1.HL.TZ1.5: Which phase of mitosis is shown in the photomicrograph? A. AnaphaseB. MetaphaseC. ProphaseD....
• 13M.1.HL.TZ2.5: What actions occur during interphase? A. DNA replication and RNA synthesisB. Spindle formation...
• 13M.3.SL.TZ2.13a: State when the total volume of OB neurons is the greatest.
• 11M.1.SL.TZ1.2: Which of the following will contribute to the cell theory? I. Living organisms are composed of...
• 11M.1.SL.TZ1.4: A cell has cytoplasm, a cell wall, naked DNA and ribosomes. Based on this information, what type...
• 11M.1.SL.TZ1.5: What do diffusion and osmosis have in common? A. They only happen in living cells. B. They...
• 12M.1.HL.TZ1.2: Which functions are carried out by all unicellular organisms?
• 12M.1.HL.TZ2.5: What is the approximate thickness of the plasma membrane of a cell? A. 10 nm B. 50 nm C. 10...
• 12M.2.SL.TZ1.2b: Outline how molecules move across a membrane by simple diffusion.
• 12M.2.SL.TZ1.6a: Describe the characteristics of stem cells that make them potentially useful in medicine.
• 09M.2.HL.TZ1.3a (i): Identify the structure labelled I and state one function of this structure.
• 09M.2.HL.TZ2.6a: Draw a labelled diagram showing the ultra-structure of a liver cell.
• 09M.2.HL.TZ2.6b: Distinguish between prokaryotic cells and eukaryotic cells.
• 09M.1.SL.TZ2.6: The diagram below shows a plasma membrane. What is molecule X? A. CholesterolB. Peripheral...
• 09M.1.HL.TZ2.4: In the diagram what does label X identify? A. Nucleoid regionB. ChromatinC. HistonesD....
• 10M.1.SL.TZ1.5: What route is used to export proteins from the cell? A. Golgi apparatus → rough endoplasmic...
• 10M.1.SL.TZ1.3: Which statement is part of the cell theory? A. Cells are composed of organic molecules. B. Cells...
• 10M.1.SL.TZ2.3: How can cells in a multicellular organism differentiate? A. They express some of their genes but...
• 11N.2.SL.TZ0.5c: Explain passive transport and active transport across membranes.
• 12N.1.HL.TZ0.2: What is proportional to a cell’s surface area? A. Rate of exchange of materialsB. Rate of heat...
• 12N.1.SL.TZ0.2: What is happening at the structure labelled X? A. Synthesis of proteins B. Transport of proteins...
• 15N.1.SL.TZ0.3: Animal cells often secrete glycoproteins as extracellular components. What is a role of these...
• 15N.1.SL.TZ0.5: What is the function of structure X? A. Active transport B. Attachment C. Binary fission D....
• 15N.2.SL.TZ0.6a: Outline the stages of the cell cycle.
• 13N.1.HL.TZ0.5: Which of the following processes take place during interphase in animal cells? I. Spindle...
• 13N.2.SL.TZ0.7a: Draw a labelled diagram to show the molecular structure of a membrane.
• 09N.1.SL.TZ0.3: Which of the following structures does Escherichia coli have? I. RibosomesII. PiliIII....
• 09N.1.SL.TZ0.5: Cells in the adrenal gland produce the hormone epinephrine and store it in vesicles. To release...
• 09N.1.SL.TZ0.6: During which stage of the cell cycle are the numbers of mitochondria increased in a cell?A....
• 16M.2.HL.TZ0.6b: Outline the effects of putting plant tissue in a hypertonic solution.
• 16N.2.SL.TZ0.2b: (i) State the process that divides one nucleus into two genetically identical nuclei. (ii)...
• 16N.3.HL.TZ0.2d: One of the functions of this organ is absorption. On the micrograph, draw an arrow showing the...
• 17M.1.SL.TZ1.4: Which organelle is involved in generating vesicles destined for the cell membrane? A. Golgi...
• 17M.1.SL.TZ2.1: The giant alga Acetabularia has a feature that suggests it is an exception to the cell theory....
• 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
• 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system....
• 17M.1.HL.TZ1.2: Which evidence falsifies the Davson–Danielli model? I. The presence of globular proteins within...
• 17M.1.SL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
• 15M.1.SL.TZ2.3: Which sequence shows increasing relative size?
• 15M.2.HL.TZ2.3b (i): Annotate the electron micrograph of the Escherichia coli cell with the function of the indicated...
• 15M.3.HL.TZ1.2b: Outline the endosymbiotic theory.
• 13M.1.HL.TZ1.3: The diatom Didymosphenia geminata is a species of single-celled alga that lives in warm, shallow...
• 13M.2.HL.TZ2.8a: Describe four different types of transport of substances across a membrane.
• 13M.2.SL.TZ1.2a (i): State the name of organelle A.
• 13M.2.SL.TZ2.4b: Explain the importance of surface area to volume ratio as a limit to cell size.
• 13M.1.SL.TZ2.4: Which structure is found in E. coli, but not in a eukaryotic cell? A. Cell wallB. Endoplasmic...
• 11M.1.HL.TZ1.4: Which pair of features is correct for both diffusion and osmosis?
• 11M.1.SL.TZ2.2: Which of the following characteristics found in a structure necessarily indicates that it is...
• 11M.1.SL.TZ2.6: If a mitochondrion has a length of 5 µm and a student’s drawing of the mitochondrion is 10 mm,...
• 11M.3.SL.TZ1.11a: The spontaneous origin of life on Earth is thought to have involved the non-living synthesis of...
• 12M.1.SL.TZ2.2: How do cells in multicellular organisms differentiate? A. Some cell types divide by mitosis more...
• 09M.2.SL.TZ2.3a: Explain how materials are moved across membranes of cells by active transport.
• 09M.1.HL.TZ2.35: Which of the following is not a function performed by a membrane protein? A. Hormone binding...
• 09M.1.SL.TZ2.2: Which of the following structures are found in all cells? A. MitochondriaB. Cell wallsC....
• 10M.2.HL.TZ1.6b: Outline, with an example, the process of exocytosis.
• 10M.2.HL.TZ2.2a (i): Calculate the power of magnification of the image.
• 10M.1.SL.TZ1.4: Which of the following are features of prokaryotes and eukaryotes?
• 10M.2.SL.TZ2.7a: Compare simple diffusion with facilitated diffusion as mechanisms to transport solutes across...
• 11N.1.SL.TZ0.9: Why do crop plants dry out when a field is irrigated with water contaminated by sea water? A....
• 12N.1.SL.TZ0.3: What is the structure labelled Y? A. Nucleus B. Starch grain C. Lysosome D. Mitochondrion
• 09N.2.SL.TZ0.5a: Draw a labelled diagram to show the fluid mosaic structure of a plasma membrane, indicating the...
• 10N.3.SL.TZ0.10a: State how many amino acids are in the same position in the E. coli (Fe), E. coli (Mn) and the...
• 10N.3.SL.TZ0.10b: State the amino acids which are present in the same position in at least one bacterial dismutase...
• 10N.3.HL.TZ0.1e: The sequences of the two bacterial dismutases and the mitochondrial dismutase show a high degree...
• 09N.3.SL.TZ0.11b: Outline two pieces of evidence that support the endosymbiotic theory for the origin of eukaryotes.
• 15N.1.HL.TZ0.6: Which molecule is labelled X? A. Cholesterol B. Glycoprotein C. Phospholipid D. Amylase
• 15N.2.SL.TZ0.7c: Describe the process of endocytosis.
• 15N.2.HL.TZ0.6c: Describe the process of endocytosis.
• 13N.1.HL.TZ0.6: Which are functions of membrane proteins?A. Hormone binding sites and DNA replicationB. Cell...
• 16M.1.HL.TZ0.14: What can be deduced about a striated muscle fibre from both of these statements? A. It is...
• 16N.2.HL.TZ0.2b: Explain how the cell cycle is controlled.
• 16N.3.SL.TZ0.3a: State from which organ the section was taken.
• 17M.1.HL.TZ1.4: The diagram shows the concentration of four cyclins during the cell cycle. Which curve represents...
• 17M.2.HL.TZ2.3d: State what change there has been in the cell surface area to volume ratio in red blood cell 1.
• 17N.1.SL.TZ0.01: Which function is accomplished by structures X and Y in the Paramecium?
• 17N.1.SL.TZ0.05: In the diagram, which part of the membrane structure does the molecule below form?
• 17N.1.SL.TZ0.13: What occurs during meiosis but not mitosis? A. Spindles are formed from microtubules. B....
• 17N.3.HL.TZ0.02b.ii: Identify the type of cell labelled Z.
• 15M.1.HL.TZ1.2: What structures are part of an Escherichia coli cell?A. Ribosomes, nucleoid and Golgi apparatusB....
• 15M.2.SL.TZ2.2a: Outline the cell theory
• 15M.2.SL.TZ1.7c: Cell membranes separate aqueous environments in cells. Explain how the properties of...
• 15M.1.HL.TZ2.6: Where are proteins synthesized by free ribosomes used? A. Outside the cell after secretionB....
• 13M.1.HL.TZ1.4: In the electron micrograph of a rat liver cell below, what are the structures labelled X and...
• 13M.2.SL.TZ1.4a: State three processes occurring in a cell during interphase of the cell cycle but not  in...
• 11M.1.HL.TZ1.2: A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what...
• 11M.1.HL.TZ1.3: An unknown cell is observed using a microscope. A cell wall, ribosomes and DNA are identified....
• 11M.1.SL.TZ1.3: A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what...
• 12M.2.HL.TZ1.6a: Describe the characteristics of stem cells that make them potentially useful in medicine.
• 12M.1.HL.TZ1.5: Which process is possible due to the fluidity of cell membranes? A. Endocytosis B. Osmosis C....
• 12M.1.SL.TZ2.3: What is the function of the Golgi apparatus? A. Transport of lipids B. Synthesis of polypeptides...
• 12M.1.SL.TZ2.4: Which structure is present in a prokaryotic cell? A. Plasma membrane B. 80S ribosome C. Nucleus...
• 12M.1.SL.TZ1.4: Where in the cell do condensation reactions involving amino acids occur? A. Nucleus B. Golgi...
• 09M.2.SL.TZ1.6a: Draw a labelled diagram to show the structure of a membrane.
• 10M.2.HL.TZ2.2b: List two examples of how human life depends on mitosis.
• 10M.1.SL.TZ2.2: In a cell, what is the effect of a large surface area to volume ratio? A. Slower rate of...
• 10M.1.SL.TZ2.6: What happens during the G2 stage of interphase? A. Homologous chromosomes pair B. Synthesis of...
• 10M.2.SL.TZ2.7b: Describe the process of endocytosis.
• 11N.1.SL.TZ0.4: Where can 70S ribosomes be found? A. On membranes of the Golgi apparatus B. In prokaryotic cells...
• 10N.2.SL.TZ0.2c: State the process that results in tumour (cancer) formation or development.
• 10N.2.SL.TZ0.2a: State the stage of mitosis typified by image II.
• 09N.2.SL.TZ0.5b: Distinguish between active and passive movements of materials across plasma membranes, using...
• 10N.3.HL.TZ0.1c: Compare the E. coli (Mn) and the mitochondrial dismutases.
• 15N.1.HL.TZ0.3: Animal cells often secrete glycoproteins as extracellular components. What is a role of these...
• 09N.1.SL.TZ0.2: If a Sequoia sempervirens tree is 100 m tall and a drawing of it is 100 mm tall, what is the...
• 16M.1.HL.TZ0.13: What is the process shown in this image? A. Binary fission of a prokaryotic cellB. Telophase...
• 16N.1.SL.TZ0.5: Which mitotic phase is labelled X in the micrograph of an onion (Allium cepa) root tip? A....
• 16N.1.SL.TZ0.1: Which feature of striated muscle cells allows them to be considered as a possible exception to...
• 16N.1.SL.TZ0.4: What provides evidence for the endosymbiotic theory? A. Mitochondrial DNA in eukaryotic cellsB....
• 16N.1.SL.TZ0.2: Which characteristic of stem cells makes them useful for treating Stargardt’s disease? A. They...
• 16M.1.HL.TZ0.15: The diagram is a model of one type of movement across a membrane. What is this type of...
• 16M.2.HL.TZ0.7a: Draw a labelled diagram of a eukaryotic plant cell as seen in an electron micrograph.
• 17M.1.HL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
• 17M.2.SL.TZ1.2b.ii: State the function of life in Paramecium that is carried out by: the contractile vacuole. 
• 17M.2.SL.TZ2.3a: Outline the use of human embryonic stem cells (hESC) to treat Stargardt’s disease.
• 17M.2.HL.TZ2.8a: Cells go through a repeating cycle of events in growth regions such as plant root tips and animal...
• 15M.1.SL.TZ1.3: A botanist measures a leaf and finds it is 24 cm long and 8 cm wide. His drawing of the leaf is 4...
• 15M.3.SL.TZ1.11a: The diagram shows some of the later stages in the origin of eukaryotic cells according to the...
• 13M.2.HL.TZ1.2b: Describe how the structure of the membrane allows the formation of vesicles.
• 13M.1.HL.TZ2.2: What are stem cells? A. Specialized cells that can be used therapeuticallyB. Surplus cells taken...
• 13M.1.SL.TZ2.6: Which process contributes to growth of a multicellular body? A. ExocytosisB. MeiosisC. MitosisD....
• 13M.3.SL.TZ2.13d: Suggest the implications of the data for humans.
• 11M.1.SL.TZ2.4: Which pair of features is correct for both a human liver cell and an Escherichia coli cell?
• 12M.1.HL.TZ2.2: How do cells in multicellular organisms differentiate? A. Some cell types divide by mitosis more...
• 12M.2.SL.TZ2.2a (i): State the mode of transport if water moves into the cell.
• 12M.1.SL.TZ1.2: Which property makes stem cells suitable for therapeutic use? A. They can divide by meiosis to...
• 09M.1.HL.TZ1.6: During which phase of the cell cycle do chromosomes duplicate? A. G1 B. S C. G2 D. Mitosis
• 10M.1.SL.TZ1.2: Which functions of life are found in unicellular organisms? A. growth, response and nutrition B....
• 10M.1.SL.TZ2.4: The diagram below shows a bacterium. What structure does the part labelled X identify? A....
• 10M.1.SL.TZ2.5: What do prokaryotic cells have that eukaryotic cells do not? A. Mitochondria B. 70S ribosomes C....
• 12N.2.SL.TZ0.3a (ii): Outline the events occurring in phase A.
• 10N.2.SL.TZ0.3a: List two functions of membrane proteins.
• 09N.3.HL.TZ0.2c: Outline two pieces of evidence that support the endosymbiotic theory for the origin of eukaryotes.
• 10N.3.HL.TZ0.1a: State how many amino acids are in the same position in the E. coli (Fe), E. coli (Mn) and the...
• 15N.2.SL.TZ0.2a: Calculate the magnification of the bacterium.
• 15N.2.SL.TZ0.2b: State the method that bacteria use to divide.
• 15N.2.HL.TZ0.2a(ii): Deduce the stage of mitosis shown in the micrograph.
• 16M.1.SL.TZ0.9: What distinguishes prokaryotic cells and eukaryotic cells?
• 17M.1.SL.TZ1.2: The following electron micrograph shows part of a palisade mesophyll cell. Which of the labelled...
• 17M.1.SL.TZ2.5: The graph shows the survival probabilities for current smokers and for those who never smoked...
• 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
• 17M.2.SL.TZ2.2b.ii: Using the table, identify the organelles labelled I and II on the electron micrograph with their...
• 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
• 17N.2.HL.TZ0.01d.ii: Muscle fibres are stimulated to contract by the binding of acetylcholine to receptors in their...
• 15M.1.SL.TZ2.6: What distinguishes prokaryotic cells from eukaryotic cells?
• 15M.2.SL.TZ2.2b (i): Annotate the electron micrograph of the Escherichia coli cell with the function of the structures...
• 13M.2.HL.TZ2.5a: Draw a labelled diagram of a prokaryotic cell.
• 13M.1.HL.TZ1.2: Which functions of life are carried out by all unicellular organisms?
• 13M.2.SL.TZ1.2c: Explain active transport across membranes.
• 11M.3.HL.TZ1.3: Discuss the endosymbiotic theory for the origin of eukaryotes.
• 11M.1.SL.TZ2.7: A number of different proteins are involved in nerve function. Which of the following does not...
• 11M.3.SL.TZ2.11b: Outline the contribution of prokaryotes to the creation of an oxygen-rich atmosphere.
• 12M.1.HL.TZ1.4: Which features are present in prokaryotic cells? A. DNA, plasma membrane and mitochondria B....
• 12M.2.SL.TZ1.2a: State two differences in structure between plant and animal cells.
• 12M.1.SL.TZ1.14: If there are 16 chromosomes in a cell that is about to divide, what will be the number of...
• 12M.1.SL.TZ1.6: In which stage of mitosis is the cell labelled X? A. Anaphase B. Interphase C. Metaphase D....
• 12M.2.SL.TZ2.2c: State the name of the structures formed within a cell by endocytosis.
• 09M.2.HL.TZ1.1i (iii): Region A inserts into the membrane. Deduce, with a reason, the nature of the amino acids that...
• 09M.1.HL.TZ1.3: How does the surface area to volume ratio change with an increase in cell size?
• 09M.1.SL.TZ1.6: What is the difference between simple diffusion and facilitated diffusion?
• 10M.1.HL.TZ1.5: Which of the following take(s) place during interphase and mitosis in animal cells? I....
• 11N.2.SL.TZ0.5a: Draw a labelled diagram to show the structure of membranes.
• 12N.2.HL.TZ0.7a: Draw a labelled diagram of the ultrastructure of a prokaryote.
• 12N.1.SL.TZ0.6: What feature of cell membranes allows endocytosis to occur? A. Fluidity of phospholipid bilayer...
• 12N.2.SL.TZ0.3c: DNA in chromosomes undergoes replication before mitosis. Outline how complementary base pairing...
• 12N.2.SL.TZ0.2b: All of these organisms belong to the animal kingdom. State two structural differences between...
• 10N.2.SL.TZ0.2b: List two processes that involve mitosis.
• 10N.3.HL.TZ0.1b: State the amino acids which are present in the same position in at least one bacterial dismutase...
• 15N.1.HL.TZ0.4: During which stage does the cell surface area to volume ratio decrease? A. Interphase B....
• 15N.2.HL.TZ0.2a(i): Calculate the magnification of the image.
• 15N.2.HL.TZ0.2a(iii): The onion (Allium cepa) is an angiospermophyte. The honey bee (Apis mellifera) is an arthropod....
• 13N.2.HL.TZ0.6a: Draw a labelled diagram of Escherichia coli as an example of a prokaryote.
• 16M.2.HL.TZ0.6a: Draw a labelled diagram that shows the positions of proteins within the cell membrane.
• 16N.2.SL.TZ0.2a: The image is an electron micrograph. Determine, with a reason, whether the image is of a...
• 16N.1.HL.TZ0.4: The giant marine alga Halicystis ovalis is able to move sodium ions from vacuoles to the...
• 16N.3.HL.TZ0.3b: Suggest reasons for different amounts of sucrose in the leaf phloem sap of the potato plants.
• 17M.1.SL.TZ1.5: When during the cell cycle does DNA replication take place?
• 17M.2.SL.TZ1.2a: Pictured below are Louis Pasteur’s original drawings of swan-necked flasks. Describe how...
• 17M.2.SL.TZ1.2c: Discuss the advantages and disadvantages of the use of adult stem cells.
• 17M.1.HL.TZ2.3: The image shows an electron micrograph of pancreatic exocrine cells. What is the role of the...
• 17N.1.SL.TZ0.14: Which diagram(s) represent(s) processes used in asexual reproduction? A. I only B. I and II...
• 17N.1.SL.TZ0.24: Dialysis membrane was set up to model digestion and absorption in the small intestine. What is...
• 17N.2.HL.TZ0.06a: Cell biologists play an important role in research into disease, fertility, evolution and many...