Question detail
Which option best identifies the exact concept boundary for Reproduction, DNA structure (biology only): students must describe each nucleotide as containing a sugar, phosphate group and one of four bases.
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 describe each nucleotide as containing a sugar, phosphate group and one of four bases.
- 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 describe each nucleotide as containing a sugar, phosphate group and one of four bases.
- 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 describe each nucleotide as containing a sugar, phosphate group and one of four bases.. 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 describe each nucleotide as containing a sugar, phosphate group and one of four bases.. Definition boundary: DNA can contain many genes; a gene has a specific coding role. This matches DNA structure (biology only) because students must describe each nucleotide as containing a sugar, phosphate group and one of four bases. is correct because DNA can contain many genes; a gene has a specific coding role. The learning objective says students must describe each nucleotide as containing a sugar, phosphate group and one of four bases, 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
Forgetting the phosphate group
Students often describe a nucleotide as only a sugar and a base, omitting the phosphate group that links nucleotides together.
Remind students that a nucleotide consists of a five‑carbon sugar, a phosphate group attached to the 5’ carbon, and one of the four nitrogenous bases (A, C, G or T).
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