Question detail
Which option correctly contrasts the named ideas for Reproduction, DNA structure (biology only): students must model insertions and deletions in chromosomes to illustrate mutations.
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 contrast: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.
- B. Reversed contrast: Calling a gene a whole chromosome. This would blur DNA vs genes instead of testing DNA structure (biology only).
- C. Over-broad contrast: Explaining protein coding without naming the gene as the relevant section of DNA. This misses the objective focus on model insertions and deletions in chromosomes to illustrate mutations.
- D. Unrelated contrast: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / DNA structure (biology only).
Answer
The correct option is Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.. 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 contrast: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations. is correct because DNA can contain many genes; a gene has a specific coding role. The learning objective says students must model insertions and deletions in chromosomes to illustrate mutations, 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
Misinterpreting the effect of a single base insertion
Students often think that adding one base to a DNA sequence simply lengthens the protein by one amino acid, ignoring the shift in the reading frame.
Explain that a single base insertion changes the triplet codon grouping from the point of insertion onward, causing a frameshift that alters every downstream amino acid and usually introduces a premature stop codon.
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