| Date | May 2022 | Marks available | 1 | Reference code | 22M.1.SL.TZ2.11 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 11 | Adapted from | N/A |
Question
What is a function of the enzyme helicase?
A. It coils DNA up into a double helical shape.
B. It links DNA nucleotides in a new DNA strand.
C. It breaks hydrogen bonds between the DNA strands.
D. It forms temporary hydrogen bonds to produce messenger RNA.
Markscheme
C
Examiners report
Syllabus sections
- 16N.1.SL.TZ0.7: The diagram shows a molecular structure. Which type of molecule is shown? A. Amino acidB....
- 18M.1.SL.TZ1.11: Nucleic acids are polymers of nucleotides. What parts of nucleotides are joined together in...
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18M.2.SL.TZ1.2c:
State two structural features that differ between RNA and DNA.
- 17N.1.SL.TZ0.10: For which discovery about DNA do Watson and Crick receive credit? A. DNA is the molecule...
- 16N.1.SL.TZ0.10: What is a similarity between DNA and RNA? A. Both are polymers of nucleotides.B. Both are...
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 18M.2.SL.TZ2.2b.i: Explain how model making helped Watson and Crick to establish the structure of DNA.
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18M.2.SL.TZ2.2a:
Label the parts of the DNA diagram indicated by I, II, III and IV.
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22M.2.HL.TZ1.8a:
Draw a labelled diagram to show the structure of a single nucleotide of RNA.
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22M.2.SL.TZ1.7a:
Draw a labelled diagram to show the structure of a single nucleotide of RNA.
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
- 21M.1.SL.TZ1.9: The hydrolysis of a pure sample of an organic molecule produces a pentose sugar, thymine,...
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22M.2.HL.TZ2.5a.ii:
Explain how the two strands of the DNA double helix are held together.
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20N.2.SL.TZ0.5a:
Draw a molecular diagram of alpha-D-glucose.
- 19M.2.HL.TZ2.7a: Distinguish between the structures of DNA and RNA.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
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20N.2.SL.TZ0.4a:
Sketch the complementary strand to complete the section of a DNA diagram.
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
- 22M.1.SL.TZ1.9: A molecule of DNA is found to contain 200 guanine bases, representing 25 % of the total...
- 19M.1.HL.TZ1.7: What is common to RNA and DNA? A. Thymine B. Nitrogenous bases C. Histones D. Deoxyribose
- 17M.2.SL.TZ1.5a: Outline how translation depends on complementary base pairing.
- 19N.2.HL.TZ0.6a: Draw the structure of a section of DNA showing all possible bases.
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18M.2.HL.TZ1.6c:
Hydrogen bonds can exist both within and between molecules in living organisms and have an impact on their structure and function. Explain the importance of hydrogen bonding for living organisms.
