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3.2 DNA and protein synthesis

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Question 30
H

A scientist tests two substances on identical cells. The table shows their effects.

Table

SubstancemRNA productionPolypeptide production
Pdecreasesdecreases
Qunchangeddecreases

Which explanation is consistent with the results?

[1]
A

P increases amino acid delivery by tRNA; Q inhibits RNA polymerase.

B

P inhibits RNA polymerase; Q prevents amino acids joining at ribosomes.

C

P prevents amino acids joining at ribosomes; Q inhibits RNA polymerase.

D

P inhibits RNA polymerase; Q increases amino acid delivery by tRNA.

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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