In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450 - protease pathway.
B) cyclin proteolysis pathway.
C) ubiquitin-proteosome pathway.
D) kinase inhibition pathway.
E) none of the above
C) ubiquitin-proteosome pathway.
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Which of the following statements about structural maintenance of chromosomes (SMC) proteins is true?
A. They have four distinct domains: N, C, and two ?-helical coiled-coil domains. B. They are usually dimeric and dimerization forms the ATP-binding site. C. Dimers of SMC proteins are all homodimers having identical subunits. D. Dimerization of SMC proteins creates a molecule with two heads and two ATP-binding sites. E. The ATP bound by SMC proteins is hydrolyzed before the heads come together in the dimer.
The insecticide parathion is detoxified in the body by the enzyme paraoxonase, which has two alleles (Q and R). A person with the genotype Q/Q living in an area of high organophosphate use would be expected to _____
1.rapidly metabolize parathion 2.be completely unable to metabolize parathion 3.be extremely sensitive to parathion poisoning 4.metabolize parathion more rapidly in infancy than during adulthood
If you want to keep cut flowers fresh, treat them with
A) auxin. B) abscisic acid. C) cytokinin. D) gibberellin. E) ethylene.
Answer the following questions true (T) or false (F)
1. Binary fission is more complicated than mitosis. 2. Gram-positive bacteria stain purple when the Gram stain is complete. 3. Prokaryotic cells that move in response to oxygen levels are said to display chemotaxis.