What are the three parts that make up the structure of most viruses?
A. Nucleic acid (either DNA or RNA), a capsid, and recognition spikes
B. Nucleic acid (either DNA or RNA), a plasma membrane, and recognition spikes
C. RNA, a plasmid, and recognition spikes
D. DNA, a plasma membrane, and recognition spikes
Answer: A
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Steroid hormone-nuclear receptor complexes:
A. have two adjacent zinc fingers in their DNA binding domain. B. bind to DNA in their monomeric form. C. have N-terminal ligand binding domains. D. are expressed uniformly in all cells.
Pyruvate can be metabolized along two major routes. They are
A. oxidation and reduction. B. fermentation and respiration. C. metabolism and anabolism. D. anabolism and catabolism.
Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. Types of proteins expressed. B. Presence of epinephrine receptors. C. Exposure to epinephrine released by neighboring cells. D. Rate of metabolism. E. Activation of protein kinases.
In which pair of organisms would you predict the DNA sequences of the ?-globin gene family are the most similar?
A. dolphin and bumble bee B. catfish and crocodile C. snake and mouse D. frog and cheetah E. human and chimpanzee