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1.2 What happens in cells (and what do cells need)?

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Question 8

Scientists compare the same section of a gene in two mushrooms.

In the first mushroom, the base sequence is GAA CTA TCG. In the second mushroom, one base has been substituted, changing the middle triplet from CTA to CCA.

The table shows the amino acid coded for by each triplet.

Triplet of basesAmino acid coded for
CCAproline (Pro)
CTAleucine (Leu)
GAAglutamic acid (Glu)
TCGserine (Ser)

Which pair of amino-acid sequences could be produced in the two mushrooms?

[1]
A

First mushroom: glutamic acid – leucine – serine; second mushroom: glutamic acid – proline – serine

B

First mushroom: glutamic acid – leucine – serine; second mushroom: proline – leucine – serine

C

First mushroom: glutamic acid – leucine – serine; second mushroom: glutamic acid – leucine – proline

D

First mushroom: glutamic acid – proline – serine; second mushroom: glutamic acid – leucine – serine

Markscheme

1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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