Question detail
Which option gives the correct cause-and-effect relationship for Reproduction, DNA structure (biology only): students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reproduction
Question
- A. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.
- B. Reversed cause: Treating DNA as if it always means one gene. This would blur DNA vs genes instead of testing DNA structure (biology only).
- C. Missing link: Calling a gene a whole chromosome. This misses the objective focus on explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.
- D. Different process: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / DNA structure (biology only).
Answer
The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.. It is the only option that keeps DNA vs genes separate and answers the approved learning objective in DNA structure (biology only).
Explanation
The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence. is correct because DNA is the molecule; a gene is a functional section of that molecule. The learning objective says students must explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence, so the answer must stay inside DNA structure (biology only). The alternative options are wrong because they either treating dna as if it always means one gene., calling a gene a whole chromosome., or drift away from when asking about dna, test molecular structure, base sequence, nucleotides, or genetic information storage..
Common mistake
Misunderstanding Base Pairing Rules
Students often think that any base can pair with any other base, or that the order of bases in DNA directly determines the amino acid sequence without considering codon structure.
Explain that only complementary bases pair (A with T, C with G) and that the DNA sequence is read in triplets (codons) on the mRNA, each codon specifying a particular amino acid. Emphasise that the sequence of codons, not the individual bases alone, determines the protein sequence.
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