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Amino acids, proteins and DNA (A-level only)

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Question 1

A double-stranded DNA fragment contains 120 base pairs. Analysis of the fragment shows that 35% of the total nitrogenous bases are adenine.

What is the total number of hydrogen bonds holding the two complementary strands of this DNA fragment together?

A

138138138

B

276276276

C

318318318

D

324324324

Markscheme

Amino acids, proteins and DNA (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Amino acids, proteins and DNA (A-level only)

30 exam-style questions on AQA A Level Chemistry Amino acids, proteins and DNA (A-level only), covering Amino acids (A-level only), Proteins (A-level only), Enzymes (A-level only), DNA (A-level only), and Action of anticancer drugs (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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