All of the following chemicals are vesicant agents, EXCEPT:
A) chlorine.
B) lewisite.
C) phosgene oxime.
D) sulfur mustard.
Answer: A) chlorine.
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________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes.
Fill in the blank(s) with the appropriate word(s).
Chemical evolution started on Earth
a. after the appearance of prokaryotic cells. b. long before any cells emerged. c. after the appearance of eukaryotic cells. d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms. e. after the appearance of multicellular organisms.
Antimicrobial drugs that inhibit folic acid synthesis work with no side effects because mammals must get folic acid from their diet.
Answer the following statement true (T) or false (F)
During male sexual arousal ____
a. penile blood vessels are constricted b. blood flow out of the penis increases c. testosterone levels fall d. sensory nerve endings of the penis are inactivated e. blood flow to the penis is increased