| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.9 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 9 | Adapted from | N/A |
Question
What is produced when the enzyme lactase is added to milk?
A. Glucose and galactose
B. Lactose
C. Glucose and fructose
D. Lactic acid
Markscheme
A
Examiners report
In contrast Questions 9, 24, 28 and 32 had very high discrimination indices. Each required secure knowledge the details of HL Biology, which diligent and capable students acquire but others tend not to.
Syllabus sections
Show 56 related questions
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- 17M.3.SL.TZ1.1d: State one factor that would need to be controlled in this experiment.
- 17M.3.SL.TZ1.1c: Outline the effect of temperature on the activity of urease enzyme.
- 17M.3.SL.TZ1.1b: One result in this experiment can be classified as an outlier as its value is very distant...
- 17M.3.SL.TZ1.1a: Outline what the standard deviations reveal about the data from this experiment.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 17M.1.SL.TZ1.7: In an experiment the effect of changing pH on an enzymatic reaction is tested. Which could be...
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
- 17M.1.SL.TZ1.10: The graph shows the effect of increasing the substrate concentration on the rate of an...
- 16N.3.HL.TZ0.1c: Explain what would happen to fish protein hydrolysis if no alkali were added to the reaction...
- 16N.3.HL.TZ0.1b: Sketch on the graph the curve expected if the hydrolysis were performed using papain 0.5 %.
- 16N.3.HL.TZ0.1a: State the effect of enzyme concentration on the hydrolysis of proteins.
- 16N.3.SL.TZ0.2c: Explain the importance of having equal quantities of the enzyme at the start of the experiment.
- 16N.3.SL.TZ0.2b: Suggest one method that could have been used to keep the tubes at a constant temperature.
- 16N.3.SL.TZ0.2a: Suggest one reason for differences between the cereal grains, in the percentage of starch...
- 16M.2.HL.TZ0.5a: Outline the action of enzymes.
- 16N.1.HL.TZ0.9: It is possible to attach β-galactosidase to alginate beads for use in the production of...
- 16N.1.SL.TZ0.9: A fever in a normally healthy adult during an illness is not usually a problem and can be...
- 15M.1.HL.TZ1.9: Why does exposure to high temperatures cause an enzyme to lose its biological properties?A....
- 15M.1.SL.TZ2.10: How can the activity of a human amylase enzyme be increased during a laboratory experiment?A....
- 15M.2.SL.TZ1.2c: Milk contains lactose which some people can digest but some cannot. Explain the production...
- 15M.1.HL.TZ2.11: Which is the activation energy of a reaction when it is catalysed by an enzyme?
- 15M.2.HL.TZ1.2a (ii): Explain the production of lactose-free milk.
- 15N.1.HL.TZ0.8: What is decreased when lactase is added to milk? A. Sweetness B. Disaccharides C....
- 13M.2.HL.TZ2.4a: Define the active site of an enzyme.
- 13M.2.HL.TZ2.4b: Explain how the active site promotes enzyme–substrate specificity.
- 13M.2.HL.TZ2.4c: Outline possible effects of acids on enzyme activity.
- 13M.1.HL.TZ1.8: Which graph shows the effect of increasing substrate concentration on enzyme activity?
- 13M.1.HL.TZ2.10: For what purpose is the enzyme lactase useful? A. Production of lactose-free milk so that...
- 13N.1.SL.TZ0.9: In enzyme experiments, the rate of enzyme activity often gradually decreases. What is most...
- 13M.2.SL.TZ2.5c: Explain the effect of changes of pH, substrate concentration and temperature on enzyme activity.
- 13N.2.SL.TZ0.7b: Some proteins in membranes act as enzymes. Outline enzyme-substrate specificity.
- 13M.1.SL.TZ2.10: What contributes to the structure of an enzyme? A. Sequence of bases linked by hydrogen...
- 13M.3.SL.TZ2.8b: Explain the role of enzymes in metabolic pathways.
- 11M.2.HL.TZ2.5a: Outline the effect of temperature and substrate concentration on the activity of enzymes.
- 11M.1.SL.TZ1.8: The graph below shows the effect of substrate concentration on enzyme activity. What...
- 11M.1.SL.TZ1.11: What is denaturation? A. A structural change of a protein that results in the loss of its...
- 11M.1.SL.TZ2.30: Which variable has the least effect on enzyme activity? A. Temperature B. Light intensity...
- 12M.1.HL.TZ1.9: Which graph shows the effect of increasing the substrate concentration on enzyme activity?
- 12M.1.SL.TZ2.10: How does an increase in temperature affect enzyme activity?
- 09M.2.HL.TZ1.6c: Outline how enzymes catalyse reactions.
- 09M.2.SL.TZ1.3b: Explain enzyme-substrate specificity.
- 09M.2.SL.TZ1.3a: Define active site.
- 09M.2.SL.TZ2.3b: Explain the effects of pH on enzyme catalysed reactions.
- 09M.1.HL.TZ2.34: Which of the following statements is true about enzymes? A. They are used up in the...
- 09M.1.SL.TZ1.11: What happens as an enzyme becomes denatured? A. The enzyme works faster. B. The enzyme works...
- 10M.2.HL.TZ1.2d: Simple laboratory experiments show that when the enzyme lactase is mixed with lactose, the...
- 10M.2.SL.TZ1.2d: Simple laboratory experiments show that when the enzyme lactase is mixed with lactose, the...
- 10M.2.SL.TZ2.5a: Outline the role of hydrolysis in the relationships between monosaccharides, disaccharides...
- 10M.2.SL.TZ2.5b: Describe the use of biotechnology in the production of lactose-free milk.
- 10M.2.SL.TZ2.5c: Explain the importance of enzymes to human digestion.
- 11N.2.HL.TZ0.5 b: Many people cannot digest lactose and benefit from a diet containing no lactose. Outline the...
- 11N.2.SL.TZ0.7c: Respiration and other processes in cells involve enzymes. Explain the factors that can affect...
- 12N.2.SL.TZ0.5b: Metabolic reactions are catalysed by enzymes. Explain how enzymes catalyse reactions and how...
