1. A DNA segment has base order AGC TTA TCG. Which copy exhibits a frameshift mutation through deletion?
A. AGC TTT CG
B. AGC TCG
C. AGC TTA TAG
D. TTA TCG
2. A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?
A. CCA TAA CT
B. CCA TAG CT
C. CCA ATA GCT
D. CCC TAG CT
3. Which type of mutation causes cystic fibrosis?
A. Substitution
B. Insertion
C. Deletion
D. Silent
4. Which statement about chromosomes is true?
A. The same number of chromosomes appears in haploid and body cells.
B. Chromosomes are found in sets of three.
C. Chromosomes contain DNA.
D. DNA contains chromosomes.
5. Which modification affects an organism’s expressed characteristics while leaving its DNA sequence unchanged?
A. substitution mutation
B. epigenetic change
C. insertion mutation
D. deletion mutation
1. B. AGC TCG
2. A. CCA TAA CT
3. B. Insertion
4. C. Chromosomes contain DNA.
5. B. Epigenetic change.