A transcriptional repressor contains an amphipathic helix. Which of the following changes within the repressor would most likely disrupt its function?
A. serine to threonine
B. aspartate to glutamate
C. leucine to valine
D. leucine to lysine
E. valine to methionine
D
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If two copies of a gene are identical alleles, the condition is referred to as
a. homozygous. b. heterozygous. c. hybrid. d. dominant. e. codominant.
The ________ is a dense network of microfilaments just beneath the plasma membrane
Fill in the blank with correct word.
A repressor protein would have which of the following effects on repressible genes with a negative
control mechanism? a. stimulate transcription in the presence of a corepressor b. turn off transcription in the presence of an inducer c. stimulate transcription in the presence of a coactivator d. turn off transcription in the presence of a corepressor e. no response
Exposure of bacteria, to which group of ultraviolet light, results in the formation of pyrimidine dimers?
A) UV-A B) UV-B C) UV-C