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

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Question 25
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Here are some of the events that occur during protein synthesis:

  1. mRNA attaches to a ribosome in the cytoplasm.
  2. DNA unwinds to expose the gene template.
  3. tRNA molecules bring amino acids to form a polypeptide chain.
  4. RNA polymerase builds a complementary mRNA strand.

What is the correct order of these events?

A

2→1→4→32 \rightarrow 1 \rightarrow 4 \rightarrow 32→1→4→3

B

2→4→1→32 \rightarrow 4 \rightarrow 1 \rightarrow 32→4→1→3

C

4→2→1→34 \rightarrow 2 \rightarrow 1 \rightarrow 34→2→1→3

D

4→1→2→34 \rightarrow 1 \rightarrow 2 \rightarrow 34→1→2→3

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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