What factors have been shown to mark a protein as short-lived?
a) All of the choices are correct.
b) a lysine at the N-terminus of the protein
c) the phosphorylation of certain residues in proteins that act at specific times within the cell cycle
d) proteins that carry a degron, a specific, internal amino acid sequence that ensures their destruction
Answer: a) All of the choices are correct.
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Which of the following is most likely to have a small protein called ubiquitin attached to it?
A) a cyclin protein, that usually acts in G1, in a cell that is in G2 B) a cell surface protein that requires transport from the ER C) an mRNA leaving the nucleus to be translated D) a regulatory protein that requires sugar residues to function properly E) an mRNA produced by an egg cell that will be retained until after fertilization
Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains
A. auxins. B. gibberellins. C. cytokinins. D. ethylene. E. abscisic acid.
Which of the following public health methods impacted the quality of life through the 20th century by lowering the incidence of many infectious diseases?
A. Water treatment B. Antimicrobial agents C. Immunizations D. Strict sanitation guidelines E. All of the choices are correct.
All of the following animals have placentas EXCEPT
a. kangaroos. b. opposums. c. echidnas. d. koalas. e. wombats.