Translation begins when the initiator tRNA binds to
a. the large ribosomal subunit.
b. the small ribosomal subunit.
c. the second tRNA.
d. the terminator codon.
e. the first codon of the mRNA.
e
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Which of the following statements regarding biogeochemical cycles is incorrect?
A. Cycles are simple systems between living and nonliving components. B. Recycling keeps nutrients in balance. C. All organisms directly participate in recycling. D. Elements cycle through biotic and abiotic environments. E. All elements originate from a nonliving, long-term reservoir.
A somatic mutation
A) occurs only in microbes. B) affects a particular subset of cells. C) affects all cells of an individual. D) is expressed only in embryos.
Which of the following is a paracrine regulator that affects almost every organ in the body?
A. insulin B. testosterone C. prostaglandin D. gonadotropin E. epinephrine
A viral infection which does not result in the production of new virions is ________ infection(s)
A) a lytic B) a latent C) a persistent D) a lysogenic E) either latent or lysogenic