| Date | May 2021 | Marks available | 1 | Reference code | 21M.1.HL.TZ2.30 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 30 | Adapted from | N/A |
Question
What molecule functions as the final electron acceptor in the mitochondrial electron transport chain?
A. Oxygen
B. ATP
C. Reduced NAD
D. Reduced FAD
Markscheme
A
Examiners report
According to the statistics, this question had the highest discrimination index with response C being the most popular incorrect response.
Syllabus sections
- 22M.1.HL.TZ2.30: The mitochondrion in the electron micrograph shows some features that make it efficient for...
- 17M.2.HL.TZ2.2b.i: Describe its location.
- 16N.3.SL.TZ0.9a: Outline how a gene gun inserts genes into plants.
- 17M.1.HL.TZ2.14: This reaction occurs in mitochondria. What explains that this reaction enables energy to...
- 16N.1.HL.TZ0.30: Which process requires oxygen in aerobic cell respiration? A. Oxidation of triose...
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19N.1.HL.TZ0.30:
The diagram shows the link reaction between glycolysis and the Krebs cycle.
[Source: © International Baccalaureate Organization 2019]
Which type of reaction is occurring?
A. Pyruvate is carboxylated.
B. CO2 is oxidized.
C. NAD+ is reduced.
D. Pyruvate is phosphorylated.
- 21M.1.SL.TZ2.30: What is a similarity between the testes of males and the ovaries of females in humans? A....
- 18M.1.HL.TZ1.30: What happens when pyruvate is converted to acetyl CoA in the link reaction? A....
- 18N.1.HL.TZ0.29: What term is used for ATP synthesis coupled to electron transport and proton movement? A. ...
- 18N.1.HL.TZ0.10: What are final products of photosynthesis and of aerobic respiration?
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19N.1.HL.TZ0.31:
Which structure in the chloroplast diagram is adapted to carry out chemiosmosis?
[Source: © International Baccalaureate Organization 2019]
- 17M.1.HL.TZ1.29: The diagram shows a mitochondrion. Which letter indicates the structure where ATP synthase is...
- 21N.1.HL.TZ1.30: Where are protons pumped, to allow chemiosmosis in aerobic respiration to occur? A. From...
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17N.1.HL.TZ0.31:
The image shows a portion of a cell containing a mitochondrion.
[Source: ‘TEM of a mitochondrion’ by Prof. R. Bellairs. Credit: Prof. R. Bellairs. CC BY 4.0.]
Where do glycolysis and electron transport occur?
- 19M.1.HL.TZ1.31: Which process is common to photosynthesis and cell respiration? A. Photolysis B. The Calvin...
- 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
- 18M.1.HL.TZ2.14: The following processes occur in aerobic cell respiration. I. Decarboxylation of...
- 21M.1.SL.TZ2.29: What is the function of the hormone leptin? A. Increase the uptake of glucose from the...
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21M.1.HL.TZ1.29:
Which equation is an example of decarboxylation?
A. Pyruvate Acetyl CoA + CO2
B. CO2 + H2O H2CO3
C. CH4 + 2O2 CO2 + 2H2O
D.
- 22M.1.HL.TZ1.30: Where in the mitochondrion does the formation of acetyl CoA occur?
- 18N.1.HL.TZ0.31: Which is a reduction reaction? A. ATP changing to ADP B. Maltose changing to glucose C. ...
- 22M.1.HL.TZ2.31: Photolysis and carboxylation of RuBP occur during photosynthesis. Where in the chloroplast do...
- 20N.1.HL.TZ0.31: Two reactions of the Krebs cycle are shown. What type of reactions are isocitrate and...
- 17M.2.HL.TZ2.2b.ii: Describe its function.
-
22M.2.HL.TZ1.7c:
Explain the role of the electron transport chain in the generation of ATP by cell respiration.
- 17N.1.HL.TZ0.29: Which reaction does not cause a net release of energy? A. ADP combines with inorganic...
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21M.2.HL.TZ1.2b:
Compare and contrast mitochondria and chloroplasts in terms of the substrates they use and the products they produce.
-
18M.2.HL.TZ1.5b:
Compare and contrast the location of ATP synthase and the movement of protons during aerobic cell respiration and photosynthesis.
- 21M.1.HL.TZ1.31: What does electron tomography allow mitochondria researchers to do? A. To produce images of...
- 17M.2.HL.TZ1.5a: Explain how chemical energy for use in the cell is generated by electron transport and...
- 18M.2.HL.TZ2.6a: Explain the stages of aerobic respiration that occur in the mitochondria of eukaryotes.
-
19M.1.HL.TZ2.15:
The diagram shows compounds in the Krebs cycle labelled as X, Y and Z.
[Source: © International Baccalaureate Organization 2019]
How many carbon atoms are there in Y and in the acetyl group of acetyl CoA?
- 19M.2.HL.TZ1.7a: Outline the roles of helicase and ligase in DNA replication.
- 20N.2.HL.TZ0.3b: Explain how ATP is generated in mitochondria by chemiosmosis.
-
18N.2.HL.TZ0.6b:
Describe the role of oxygen in aerobic cell respiration.
- 18M.2.HL.TZ1.5c: Using the table, distinguish between the production of ATP, use of oxygen and release of CO2...
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19M.1.HL.TZ1.30:
The electron micrograph shows a section through part of an animal cell.
[Source: https://en.wikipedia.org/wiki/Mitochondrion#/media/File:Mitochondria,mammalian_lung_-TEM.jpg,
by Louisa Howard.]Which process is occurring on the structures labelled X?
A. The Krebs cycle
B. The link reaction
C. Glycolysis
D. Phosphorylation of ADP
