Identify the role of oxygen in photosynthesis.
A. It is the initial electron releaser.
B. It is the final electron acceptor.
C. It is a waste product in the light reactions.
D. It is split to form sugar.
Answer: C
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An mRNA sequence is 5?AUG-GGC-ACU-CAU-ACU-UAA3?, where AUG is the start codon and UAA is the stop codon. How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?
A. 2 B. 3 C. 4 D. 5 E. 6
Depolarization of the neuron plasma membrane occurs due to
a. the diffusion of K+ into the cell. b. the diffusion of K+ out of the cell. c. the diffusion of Na+ into the cell. d. the diffusion of Na+ out of the cell. e. closed gated channels.
The term species richness refers to the number of species in a specific location. Indicate whether the statement is true or false
Which of the following statements is (are) true concerning the vitelline layer of the sea urchin egg?
A) It is outside the fertilization membrane. B) It releases calcium, which initiates the cortical reaction. C) It has receptor molecules that are specific for binding acrosomal proteins. D) A and B are true. E) A, B, and C are true.