What would be the valence number of electrons in the sulfur atom 3216S?
A. 32
B. 2
C. 8
D. 6
E. 16
Answer: D
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Hormones are used primarily for
a. signaling target cells in the vicinity of the secreting cells. b. stimulating transmitter release at certain synapses. c. integrating social behavior in a population. d. causing a response in a part of the body some distance from the site of secretion. e. all of these, depending on the species
When __________ comes in contact with acidic gastric juices, it is converted to __________, the main
digestive enzyme of the stomach. a. carboxyamylase; amylase b. amylase; carboxyamylase c. pepsin; pepsinogen d. pepsinogen; pepsin e. bolus; chyme
Which of the following is not a reason the skin is a useful barrier?
A) The skin is enriched with antimicrobial peptides. B) The skin is enriched with lipids to serve as a water-resistant layer. C) The skin produces mucus to trap microbes. D) The outermost layer is made up of tightly compacted dead epithelial cells. E) The skin is enriched with specialized proteins such as keratin.
Why can't we use modern atmospheric conditions to infer the origin of life?
What will be an ideal response?