Question detail
Which option correctly contrasts the named ideas for Reproduction, DNA structure (biology only): students must describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars.
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 describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars.
- 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 describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars.
- 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 describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars.. 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 describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars. is correct because DNA can contain many genes; a gene has a specific coding role. The learning objective says students must describe the long DNA strands as alternating sugar and phosphate sections with bases attached to the sugars, 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
Misidentifying the backbone
Students often say the DNA backbone is made of bases and sugars, confusing the sugar‑phosphate backbone with the base pairs.
Explain that the backbone is a repeating sugar‑phosphate chain; the bases (A, C, G, T) attach to the sugars and face inward to pair with complementary bases on the opposite strand.
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