The proteins that bind to the DNA near regions where gene transcription begins are called
A) promoter genes.
B) homeobox genes.
C) mRNA.
D) the gray crescent.
E) transcription factors.
E
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Which statement does NOT correctly describe hormones that can directly enter a cell?
A. Steroid hormones can enter directly into cells because of their hydrophobic makeup. B. Water-soluble hormones can enter directly into cells because of their nonpolar makeup. C. Steroid hormones dissolve poorly in the plasma and are transported to target cells via special protein carriers. D. Once these hormones enter a cell, they bind to a cytoplasmic receptor and travel as a complex to the nucleus, or they may bind to the receptor after entering the nucleus.
Antiseptics are generally regulated by the ________.
A. Environmental Protection Agency B. The National Institutes of Health C. Centers for Disease Control and Prevention D. Food and Drug Administration
The most likely method by which the mutated CCR5 gene prevents AIDS is by
A) covering the cell membrane. B) rupturing the nuclear membrane. C) attacking and destroying the HIV virus particles. D) coding for a protective protein in the cell membrane.
Archaeal membranes are distinguished from bacterial and eukaryotic membranes by the presence of
a. glycerol molecules. b. ether-linked lipids. c. 20-carbon side chains. d. hydrophobic regions.