Question detail
Which option best identifies the exact concept boundary 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. Definition boundary: DNA can contain many genes; a gene has a specific coding role. 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. Scale confusion: Calling a gene a whole chromosome. This would blur DNA vs genes instead of testing DNA structure (biology only).
- C. Process confusion: Explaining protein coding without naming the gene as the relevant section of DNA. This misses the objective focus on explain (HT only) how DNA structure affects the protein made by controlling the amino acid sequence.
- D. Evidence confusion: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / DNA structure (biology only).
Answer
The correct option is Definition boundary: DNA can contain many genes; a gene has a specific coding role. 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 Definition boundary: DNA can contain many genes; a gene has a specific coding role. 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.. Definition boundary: DNA can contain many genes; a gene has a specific coding role. 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 can contain many genes; a gene has a specific coding role. 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 calling a gene a whole chromosome., explaining protein coding without naming the gene as the relevant section of dna., or drift away from when asking about genes, test a section of dna, protein coding, alleles, or inherited characteristics..
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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