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

Biology & Microbiology

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Which amino acid is least soluble in water?

A. Alanine B. Glutamine C. Glycine D. Isoleucine

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology