All of the following are nonspecific defense mechanisms or barriers used by an animal except:a
acid secretions of the stomach.
b. inflammation.
c. antibodies.
d. mucus in the respiratory tract.
e. skin.
C
Biology & Microbiology
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Which of the following is NOT a mollusk?
A. a chiton B. a nautilus C. a nudibranch D. an oyster E. a brachiopod
Biology & Microbiology
One of the main functions of the hypothalamus is to produce ____ hormones, which affect the ____
pituitary.
a. releasing; posterior b. releasing; anterior c. activating; posterior d. amplification; anterior e. suppressing; anterior
Biology & Microbiology
Chromatin consists of
a. DNA and histones. b. DNA, histones, and many other nonhistone proteins. c. mostly RNA and DNA. d. RNA, DNA, and nonhistone proteins. e. DNA only.
Biology & Microbiology
Which structure is the boundary between living cell and its environment
a. cell membrane b. cytoplasm c. vacuole d. ribosome
Biology & Microbiology