In both prokaryotes and eukaryotes the start codon (or initiator codon) is ____, which codes for the
amino acid ____.
a. UGA; proline
b. UUU; phenylalanine
c. AAA; lysine
d. ACG; threonine
e. AUG; methionine
E
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If you were reading off the sequence of amino acids in the figure to a biologist friend, what should the first three letters be?
A) M-N-G B) A-P-A C) It does not matter, since the protein has no polarity or directionality.
The MOST important potential common source of infectious disease is
A) industrial waste. B) arthropod reservoirs found near surface water supplies. C) water. D) human and animal wastes.
The Nef protein helps HIV evade the adaptive immune system by____
a. destroying cytotoxic T cells b. destroying class I MHC proteins present on the surface of infected cells c. destroying class I MHC proteins in the cytoplasm d. binding to class I MHC proteins at the cell surface, thereby blocking their availability to cytotoxic T cells e. binding to class I MHC proteins and preventing their transport to the cell surface
All eicosanoids are synthesized from
a. cholesterol. b. arachidonic acid. c. prostaglandin. d. thromboxane A.