CAIE A-Level Biology AS 6.2.4 Dna Strands in Transcription Questions
Explain how the template strand determines RNA sequence during transcription, using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain which DNA strand is transcribed and how the template determines the RNA sequence.
CAIE A-Level Biology AS 6.2.4 Dna Strands in Transcription Questions question 1
During one cardiac cycle:
- blood enters the heart from the lungs and from the rest of the body
- blood leaves the heart to be transported to the lungs and to the rest of the body.
The cause of the differences between sickle cell haemoglobin and normal haemoglobin is a mutation in the gene that codes for one of the two types of polypeptide found in a haemoglobin molecule. This mutation leads to a change in the mRNA produced during transcription, causing a change in the primary structure of the polypeptide formed.
Fig. 3.1 shows some of the changes that occur as a result of this gene mutation.
With reference to Fig. 3.1, state:
- the base sequence of DNA triplet P
- the base sequence of DNA triplet Q
- the base sequence of mRNA codon R.
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