CAIE A-Level Biology AS 6 Nucleic Acids and Protein Synthesis Questions

Practise moving between nucleotide structures, DNA replication, base sequences, transcription, translation and mutation evidence.

Covered syllabus points

6.1 Structure of Nucleic Acids and DNA Replication 6.2 Protein Synthesis

[Maximum number: 1]

Which statements are correct for all nucleotides?

1 The nitrogen-containing base is always attached to carbon atom 1 of the pentose.
2 The phosphate group is always attached to carbon atom 5 of the pentose.
3 A condensation reaction occurs to join the nitrogen-containing base to the pentose.
4 Nucleotides are linked together by condensation reactions between phosphate groups.

1, 2 and 3

1 and 2 only

1, 3 and 4

2, 3 and 4

[Maximum number: 1]

One gene provides the code for the production of which type of molecule?

amino acid

DNA

nucleotide

polypeptide

[Maximum number: 1]

Which row represents the correct features of guanine?

has a single ring structure

is a purine

joins its complementary base via three hydrogen bonds

pairs with thymine

key

✓ = correct

$\boldsymbol{\chi}=$ not correct

✓

$\boldsymbol{\chi}$

✓

$\boldsymbol{\chi}$

✓

$\boldsymbol{\chi}$

✓

$\boldsymbol{\times}$

$\boldsymbol{\chi}$

✓

[Maximum number: 1]

The mRNA codons ACU, ACC, ACA and ACG all code for the same amino acid, threonine.
Which anticodons could specify an amino acid other than threonine?
1 UCA
2 ACC
3 UGU
4 UGC

1,3 and 4

1 and 2

2 and 3

3 and 4 only

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Covered syllabus points

Question 1

Question 2

Question 3

Question 4