Which of the following steps of translation does not specifically require the hydrolysis of GTP?
A. release of EF-Tu from the aminoacyl-tRNA inserted at the A site
B. the peptidyl transferase reaction
C. the movement of the ribosome one codon toward the 3' end of the mRNA
D. dissociation of certain release factors during termination
B
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Chronic high stress is associated with high cortisol levels that harm cells in the hippocampus, a brain region associated with ________
a. immune system regulation b. appetite control c. sexual function d. learning and memory
If the codon consisted of only two nucleotides, there would be how many different kinds of codons?
a. 4 b. 8 c. 16 d. 32 e. 64
Photosynthesizing plants rely on water to
a) replace electrons that are excited by light energy and passed from molecule to molecule down and electron transport chain b) replenish oxygen molecules that are lost during photosynthesis c) provide the protons necessary to produce chlorophyll d) concentrate the beams of light hitting a leaf, focusing then on the reaction center e) serve as a high-energy electron carrier
Which of the following species is credited with the first knowledge of fire and cooking meat?
a) Homo habilis b) Homo erectus c) Cro-Magnon d) Australpithecus afarensis e) Homo sapiens