| Date | May 2017 | Marks available | 1 | Reference code | 17M.2.HL.TZ1.2 |
| Level | Higher level | Paper | Paper 2 | Time zone | Time zone 1 |
| Command term | State | Question number | 2 | Adapted from | N/A |
Question
Nucleosomes help to regulate transcription in eukaryotes.
State the components of a nucleosome.
Nucleosomes help to regulate transcription in eukaryotes.
State a chemical modification of a nucleosome that could impact gene expression.
Markscheme
DNA and histone
methylation/acetylation/phosphorylation/epigenetic tags/modification of nucleosome tails/N-terminal tails
Examiners report
Syllabus sections
- 22M.1.HL.TZ1.27: During modification in eukaryotes, mRNA is spliced. What is splicing of mRNA? A. Separation...
- 18M.1.HL.TZ2.11: How can environmental factors affect the expression of genes? A. By promoting the...
- 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....
-
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...
-
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.
-
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...
-
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.
-
21N.2.HL.TZ0.6b:
Explain transcription.
