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3.2 DNA and protein synthesis

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Question 3
F

One strand of a section of DNA has this sequence of bases.

A T T G C A G C

a.

Write the sequence of bases on the complementary strand.

[2]
b.

Calculate the percentage of the bases in this double-stranded section of DNA that are G.

[2]
c.

Explain why the two strands of a DNA molecule can be separated easily.

[2]
d.

A student wrote:

"In a nucleotide, the base is attached to the phosphate group."

Give the error in the student's statement.

[1]
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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