IB Biology Topic D2.2 Gene Expression Questionbank (HL)

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IB Biology Topic D2.2 Gene Expression Questionbank (HL) | RevisionDojo

Question

HLPaper 1A

View answer

The function of silencer DNA sequences is to:

Increase transcription rates

Inhibit transcription when bound by repressors

Bind RNA polymerase to initiate transcription

Stabilize mRNA in the cytoplasm

Question

HLPaper 2

Epigenetic mechanisms can regulate gene expression in development, physiology and responses to the environment.

(a)

the consequences of genomic imprinting in lion–tiger hybrids, explaining the origin of size differences between ligers and tigons.

[4]

(b)

how environmental pollutants, such as air pollution, can influence the epigenetic regulation of immune response genes.

[4]

(c)

the mechanism by which oestrogen regulates gene expression related to endometrial development and maintenance in the uterine cycle.

[7]

HLPaper 1B

In the image below, the left panel shows changes in global DNA methylation levels (%) in somatic cells over three generations ( $F_0$ to $F_3$ ) following an environmental stimulus in the generation. The right panel displays the expression level of a phenotypic trait over six generations ( to ), highlighting how the phenotype changes across generations despite no changes in the DNA sequence.

HLPaper 2

Figure showing transcriptional regulation of gene $A$ in a eukaryotic cell.

(a)

the function of the promoter shown in the figure.

[1]

(b)

the role of (i) transcription factors and (ii) mediator proteins in this diagram.

HLPaper 1A

Which of the following sequences acts to increase transcription when bound by an activator?

Practice IB Biology Topic D2.2 Gene Expression with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for D2.2 Gene Expression and mirrors Paper 1A, 1B, 2 style where relevant.

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IB Biology Topic D2.2: Gene Expression Questionbank

IB Biology Topic D2.2: Gene Expression Questionbank