The DNA sequence 5? ATGGGGGACACC 3? encodes the amino acids Met Gly Asp Thr. A mutation changes the sequence to 5? ATGGGTGACACC 3?, but the same amino acids are encoded. What type of mutation has occurred?

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


C) silent mutation

Biology & Microbiology

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Assume that a bacterial cell produces a lac repressor that is able to bind to the operator sequence of the

lac operon but cannot bind allolactose. Explain the effect of transcription of the lac operon when lactose is not present, and then when it is present.

What will be an ideal response?

Biology & Microbiology

Down syndrome involves trisomy ____

a. 3 b. 5 c. 15 d. 19 e. 21

Biology & Microbiology

The portion of the ear that allows for balance control

is indicated by a. A. b. B. c. C. d. E. e. nothing labeled on this figure.

Biology & Microbiology

According to the classification given by the authors, somatic senses

a. are distributed in several locations over the body. b. reside in certain receptor organs located at a few specific locations. c. are exemplified by ears and eyes. d. include sight and sound. e. are perceived by photoreceptors.

Biology & Microbiology