A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is a

A) frameshift mutation.
B) missense mutation.
C) silent mutation.
D) nonsense mutation.


B) missense mutation.

A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is a missense mutation.

Biology & Microbiology

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In order for high level expression of the E. coli lac operon to occur, a complex of catabolite activator protein and ________ must be bound to the DNA near the promoter.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Using the genetic code shown here, predict what type of mutation has occurred in the hemoglobin sickle-cell anemia allele.


Normal allele 5'–GGAAUGAAACAGGAACCC–3'
Mutant allele 5'–GGAAUGAAACAGGUACCC–3'
A. a point mutation, Val to Glu
B. addition of a new stop codon
C. a frameshift mutation
D. a point mutation, Glu to Val
E. a silent mutation

Biology & Microbiology

Sperm mature and are stored in the epididymis

a. True b. False

Biology & Microbiology

Which of the following viruses can establish a chronic infection of the liver which may progress to liver cancer?

A. hepatitis A B. HTLV-1 C. hepatitis C D. hepatitis D E. hepatitis E

Biology & Microbiology