Question

A DNA segment has base order AGC TTA TCG. Which copy exhibits a frameshift mutation through deletion?(1 point)
Responses

AGC TTT CG
AGC TTT CG

AGC TCG
AGC TCG

AGC TTA TAG
AGC TTA TAG

TTA TCG

A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?(1 point)
Responses

CCC TAG CT
CCC TAG CT

CCA ATA GCT
CCA ATA GCT

CCA TAG CT
CCA TAG CT

CCA TAA CT

Which type of mutation causes cystic fibrosis?(1 point)
Responses

insertion
insertion

substitution
substitution

deletion
deletion

silent

Which statement about chromosomes is true?(1 point)
Responses

Chromosomes are found in sets of three.
Chromosomes are found in sets of three.

Chromosomes contain DNA.
Chromosomes contain DNA.

The same number of chromosomes appears in haploid and body cells.
The same number of chromosomes appears in haploid and body cells.

DNA contains chromosomes.

Which modification affects an organism’s expressed characteristics while leaving its DNA sequence unchanged?(1 point)
Responses

deletion mutation
deletion mutation

insertion mutation
insertion mutation

epigenetic change
epigenetic change

substitution mutation

Answer 1

1) AGC TTA TCG — which copy shows a frameshift by deletion?
Answer: AGC TTT CG

2) CCC ATA GCT — which copy shows a deletion in the first codon and then a substitution?
Answer: CCA TAA CT

3) Which type of mutation causes cystic fibrosis?
Answer: deletion (e.g. the ΔF508 three‑base deletion in CFTR)

4) Which statement about chromosomes is true?
Answer: Chromosomes contain DNA.

5) Which modification affects expression while leaving DNA sequence unchanged?
Answer: epigenetic change