This newly identified organism plays what healthy role for the skin
a. oxygen turnover due to its sulfur-deoxidizing ability
b. sulfur turnover due to its chlorine-deoxidizing ability
c. carbon dioxide turnover due to its ammonia-oxidizing ability
d. nitrogen turnover due to its ammonia-oxidizing ability
Answer: d. nitrogen turnover due to its ammonia-oxidizing ability
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Approximately how many species have we described out of the species alive today? We have described _____
A) almost all of the species on Earth. B) about one-eighth of the species on Earth. C) about one-quarter of the species on Earth. D) about half of the species on Earth. E) only a small fraction of the species on Earth.
Which of the following is mismatched?
a. acetylcholine; muscle contraction b. endorphin; pain perception c. norepinephrine; fight-or-flight response d. serotonin; sexual function e. GABA; major inhibitor in the brain
Which of the following is NOT true concerning the
root endodermis? a. It regulates the movement of water and minerals into the vascular cylinder. b. It contains a water-impermeable waxy strip. c. It is a layer of cells surrounding the vascular cylinder. d. It forces water to move through its Casparian strip. e. It separates the vascular cylinder from the cortex of a root.
Which of the following pairs of researchers determined whether or not DNA replications is conservative, semiconservative, or dispersive?
A. Hershey and Chase B. Meselson and Stahl C. Beadle and Tatum D. Watson and Crick