Which of the following best describes the physiological significance of the different oxygen-binding capabilities of hemoglobin and myoglobin?
(A) They prevent muscles from depleting oxygen levels in the blood.
(B) They cause muscles to become anaerobic.
(C) They prevent glycogen depletion in muscles.
(D) They enhance movement of oxygen from the blood into the muscles.
Ans: (D) They enhance movement of oxygen from the blood into the muscles.
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Except for a shallow surface layer, the earth's crust is known to be free of microorganisms.
Answer the following statement true (T) or false (F)
The objective of the Doha (Qatar) Round of trade negotiations was to
a. increase tariffs on oil products. b. place quotas on agricultural imports to the Middle East. c. lower trade barriers between countries of varying prosperity. d. put technical barriers on intellectual property.
DNA replication occurs
a. before mitosis. b. immediately before prophase of mitosis. c. during prophase of mitosis. d. during metaphase of mitosis.
e. at any time during cell division.Which of the following is an example of alternation of generations?
A) A grandparent and grandchild each have dark hair, but the parent has blond hair. B) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte). C) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization to produce a diploid zygote. D) A haploid mushroom produces gametes by mitosis, and the gametes undergo fertilization, which is immediately followed by meiosis.