Three major differences between humans and chimpanzees are that humans are bipedal, have a larger brain, and have a larger body. Which of these characteristics evolved first?
a. bipedality and larger brain evolved together first
b. bipedality
c. larger brain
d. larger body
e. larger brain and larger body evolved together first
Ans: b. bipedality
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Racker and Stoeckenius used synthetic phospholipid membrane vesicles that contained a light-activated protein pump
and ATP synthase to test Mitchell's chemiosmotic hypothesis. What was the conclusion of this experiment?
a. Phospholipid membrane vesicles require a proton gradient to maintain integrity. b. ATP synthase is powered by the proton-motive force. c. ATP synthase can generate a proton gradient. d. Light-activated proton pumps can generate a proton gradient. e. Light-activated proton pumps interact with ATP synthase to modulate its activity.
In terms of their nitrogenous base component, how many different kinds of RNA nucleotides are
there? a. 3 b. 4 c. 5 d. 6 e. 12
The typical human male has
A. 22 pairs of chromosomes. B. 22 pairs of chromosomes and two Y chromosomes. C. 22 pairs of chromosomes and one X and one Y chromosome. D. 23 X or 23 Y chromosomes.
In which way are NADH and FADH2 related?
a. They both carry high-energy phosphates. b. They both carry high-energy electrons. c. They are both used in glycolysis. d. They both directly produce ATP.