| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.HL.TZ2.11 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 11 | Adapted from | N/A |
Question
How can environmental factors affect the expression of genes?
A. By promoting the replication of nucleosomes
B. By inactivating epinephrine
C. By making specific changes to the base sequence of genes
D. By causing the pattern of DNA methylation to be changed
Markscheme
D
Examiners report
Syllabus sections
- 22M.1.HL.TZ1.27: During modification in eukaryotes, mRNA is spliced. What is splicing of mRNA? A. Separation...
- 22M.1.HL.TZ2.27: Promoters are non-coding regions in DNA. What is the role of a promoter? A. It starts...
- 19M.2.HL.TZ2.2b.ii: Suggest a way methylation may affect tumour cell genes.
- 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
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17M.1.HL.TZ2.12:
In which process(es) do nucleosomes play a role in eukaryotes?
I. tRNA activation
II. Transcription regulation
III. DNA supercoiling
A. I only
B. II only
C. II and III only
D. I, II and III
- 17N.1.HL.TZ0.26: Some regions of DNA do not code for the production of proteins. What are these regions of DNA...
- 17M.2.HL.TZ1.2a.ii: Nucleosomes help to regulate transcription in eukaryotes. State a chemical modification of a...
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21M.1.HL.TZ2.27:
What is a feature of transcription in the single-celled organism shown in the electron micrograph?
[Source: George E. Palade Electron Microscopy Slide Collection Harvey Cushing/John Hay Whitney Medical Library Yale University Library.]
A. mRNA splicing
B. Removal of introns
C. Codon-anticodon binding
D. Synthesis of RNA in a 5′ to 3′ direction
- 19M.2.HL.TZ2.2b.i: Outline the difference in methylation pattern between tumorous and normal tissue samples.
- 18M.1.HL.TZ2.10: Gene expression in cells is regulated at various stages. During which stage does splicing of...
- 17M.2.HL.TZ2.8c: Explain the control of gene expression in eukaryotes.
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17N.2.HL.TZ0.07b:
Nitrogen is part of many important substances in living organisms.
Distinguish between transcription and translation.
- 20N.1.HL.TZ0.26: The number of protein-coding genes in the human genome is estimated to be about 20 000, which...
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21N.2.HL.TZ0.6a:
Draw labelled diagrams to show the structure of RNA nucleotides and how they are linked together to form a molecule of RNA.
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21N.2.HL.TZ0.6b:
Explain transcription.
