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3.2 DNA and protein synthesis

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Question 28
H

The DNA template sequence for part of a protein changes from TAC CTT AAA to TAC CAT AAA. In RNA, uracil pairs with adenine.

The table shows some mRNA codons.

Table

mRNA codonAmino acid
AUGmethionine
GAAglutamic acid
GUAvaline
UUUphenylalanine

Which change occurs in the amino acid sequence?

[1]
A

Methionine is replaced by phenylalanine.

B

Glutamic acid is replaced by valine.

C

Phenylalanine is replaced by methionine.

D

Valine is replaced by glutamic acid.

Markscheme

3.2 DNA and protein synthesis Questions

  1. GCSE
  2. /Biology
  3. /3.2 DNA and protein synthesis

44 exam-style questions on Edexcel GCSE Biology 3.2 DNA and protein synthesis, covering 3.2.1 DNA structure as a polymer, 3.2.2 Genome and gene definitions, 3.2.3 Extracting DNA from fruit, 3.2.4 Base order determines protein shape, 3.2.5 Stages of protein synthesis, 3.2.6 Non-coding DNA variants affecting phenotype, and 3.2.7 Coding DNA variants affecting phenotype. Each one has a worked solution and a mark scheme showing where the marks go.

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