Large or polar hormones cannot enter a cell directly. Which of the following molecules can act as a second messenger for such hormones?
A. catecholamine
B. cyclic AMP
C. epinephrine
D. norepinephrine
E. calcitonin
B. cyclic AMP
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Which amino acid is least soluble in water?
A. Alanine B. Glutamine C. Glycine D. Isoleucine
The primary reason for the circularization of eukaryotic mRNA through the interaction of proteins bound at the 5' terminus and 3' poly(A) tail is to:
A. sequester unneeded transcripts. B. prevent the phosphorylation of eIF4G. C. ensure that the mRNA is fully processed before translation begins. D. None of the choices is correct.
Which of the following features would NOT be found in bryophytes?
A. flagellated sperm B. megaphylls C. a gametophyte dependent on the sporophyte D. alternation of generations
Which energy conversion characterizes photosynthesis?
A.) electromagnetic energy-> heat energy B.) electromagnetic energy-> kinetic energy C.) electromagnetic energy-> CO2 D.) electromagnetic energy-> oxidation energy E.) electromagnetic energy-> chemical bond energy