Hemoglobin is composed of four _______.
A. protein chains
B. heme groups
C. iron atoms
D. two of the above
E. all of the above
Answer: E. all of the above
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Why is eating carrots thought to be useful for enhancing vision?
A. High levels of chlorophyll in carrots helps with photosynthesis in the eyes. B. High levels of beta-carotene can lead to the production of a pigment used in vision. C. High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions. D. High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions.
They serve as the working parts of cilia and flagella
A) Cristae B) Electron transport chain C) Microtubules D) Glycolysis E) Flagella F) Plasma membrane G) Citric acid cycle H) ATP
How long ago did the hominid evolutionary line
diverge from that leading to the great apes? a. about 3 million years ago b. between 10 million and 5 million years ago c. during the Eocene epoch d. less than 2 million years ago e. about 1.5 million years ago
In the axoneme, sidearms
A) are 10 protofilament incomplete microtubules attached to 13 protofilament microtubules. B) generate force to slide microtubules past one another. C) project toward the central pair from each outer doublet. D) link adjacent doublet microtubules to limit sliding. E) are complete 13 protofilament microtubules.