Question detail
Which option gives the correct cause-and-effect relationship 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 cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.
- B. Reversed cause: Treating DNA as if it always means one gene. This would blur DNA vs genes instead of testing DNA structure (biology only).
- C. Missing link: Calling a gene a whole chromosome. This misses the objective focus on model insertions and deletions in chromosomes to illustrate mutations.
- D. Different process: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / DNA structure (biology only).
Answer
The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. 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 cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches DNA structure (biology only) because students must model insertions and deletions in chromosomes to illustrate mutations. is correct because DNA is the molecule; a gene is a functional section of that molecule. 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 treating dna as if it always means one gene., calling a gene a whole chromosome., or drift away from when asking about dna, test molecular structure, base sequence, nucleotides, or genetic information storage..
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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