IB Biology HL D1.2.13 Hl Initiation of Transcription At Promoter Questions

Explore how promoters and transcription factors position RNA polymerase to begin transcription in IB Biology HL D1.2.13.

Exam points

Define a promoter as a non-coding DNA region upstream of a gene that marks the transcription start region.
Explain that transcription factors help RNA polymerase bind the promoter and initiate transcription in the correct orientation.
Use promoter location and RNA-polymerase binding evidence to identify where transcription begins.

[Maximum number: 2]

The diagram shows the tandem repeats on two different chromosomes for a couple and their children. The number of tandem repeats of the sequence AGAT is shown on chromosome 5 (Chr 5) and the sequence of AGAA on chromosome 18 (Chr 18). One child is adopted.

Figure for Question IB Biology HL D1.2.13 Hl Initiation of Transcription At Promoter Questions question 1 — IB Biology HL

Explain the function of a promoter in DNA.

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a	is a non-coding/non-transcribed section of DNA/bases;
b	transcription starts/is initiated at the promoter;
c	region for binding (to DNA) of RNA polymerase OR region for RNA polymerase to separate the DNA strands;
d	located upstream of the gene/coding sequence;
e	helps to control/regulate gene expression;

IB Biology HL D1.2.13 Hl Initiation of Transcription At Promoter Questions question 1