Summer 2026 Predicted
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1 The diagram shows part of a gene and how its DNA codes for amino acids.
(a) Using the information in the diagram, identify which strand is the antisense
(template) strand. Explain your answer.
(2)
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(b) State the base sequence of the mRNA codon that would be produced from the
AGA triplet.
(1)
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(c) Using your knowledge of complementary base pairing, explain how the mRNA
codon is formed.
(2)
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(d) Explain why only one of the two DNA strands is used as the template for
transcription.
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(2)
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for more papers: tyrionpapers.com
Turn over
for more papers: tyrionpapers.com
,DO NOT WRITE IN THIS AREA
1 The diagram shows part of a gene and how its DNA codes for amino acids.
(a) Using the information in the diagram, identify which strand is the antisense
(template) strand. Explain your answer.
(2)
DO NOT WRITE IN THIS AREA
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
for more papers: tyrionpapers.com
, DO NOT WRITE IN THIS AREA
(b) State the base sequence of the mRNA codon that would be produced from the
AGA triplet.
(1)
………………………………………………………………………………………………………………………
(c) Using your knowledge of complementary base pairing, explain how the mRNA
codon is formed.
(2)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
(d) Explain why only one of the two DNA strands is used as the template for
transcription.
DO NOT WRITE IN THIS AREA
(2)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
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for more papers: tyrionpapers.com