Which of the following is false about fMet-tRNAf, the initiator tRNA. a. fMet-tRNAf has a formylated amino group on a methionine residue which blocks the free NH2 group, preventing the initiator tRNA from participating in chain elongation.
b. fMet-tRNAf is only used for initiation, recognizing the codons AUG or GUG and occasionally UUG. fMet-tRNAf does not respond to internal AUG codons on an mRNA molecule.
c. the last two bases in the stem of fMet-tRNAf do not form base pairs as in all other tRNAs which prevent it from participating in elongation. Mutations that create base pairs in this region allow it to function in elongation.
d. a series of 3 G-C pairs in the stem of the loop containing the anticodon is exclusive to fMet-tRNAf. Mutations in these base pairs prevent the fMet-tRNAf from being inserted into the P site of the ribosome.
e. none of the above.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

The accompanying figure shows the percent of selected dna sequences that match between a chimpanzee and other primates. these data support the hypothesis that the figure shows the percentage of selected d n a sequences that match between the chimpanzee and other primates. the human has an almost 98 percent match, the gorilla has an almost 97 percent match, the orangutan has a 96 percent match, the gibbon has an almost 95 percent match, and the old world monkey has an almost 92 percent match. the accompanying figure shows the percent of selected dna sequences that match between a chimpanzee and other primates. these data support the hypothesis that the figure shows the percentage of selected d n a sequences that match between the chimpanzee and other primates. the human has an almost 98 percent match, the gorilla has an almost 97 percent match, the orangutan has a 96 percent match, the gibbon has an almost 95 percent match, and the old world monkey has an almost 92 percent match. chimpanzees and gibbons are the most closely related the chimpanzee's closest surviving relative is humans orangutans are the primates least closely related to chimpanzees old world monkeys and gibbons are the most closely related

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto