Question detail
Which option avoids the common misconception in this objective 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. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.
- B. Common misconception: Explaining protein coding without naming the gene as the relevant section of DNA. This would blur DNA vs genes instead of testing DNA structure (biology only).
- C. Partial misconception: Treating DNA as if it always means one gene. This misses the objective focus on model insertions and deletions in chromosomes to illustrate mutations.
- D. Terminology mix-up: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / DNA structure (biology only).
Answer
The correct option is Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. 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 Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations. is correct because A DNA base sequence is the storage format; a gene is the named instruction unit. 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 explaining protein coding without naming the gene as the relevant section of dna., treating dna as if it always means one gene., or drift away from do not use dna, gene, and chromosome as interchangeable answers..
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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