Which type of junctions involves closable channels that connect the cytoplasm of adjoining animal cells?

a. gap junctions
b. plasmodesmata
c. tight junctions
d. adhering junctions
e. blocking proteins


a

Biology & Microbiology

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Which of the following characteristics is shared by a hagfish and a lamprey?

A) a rasping tongue B) paired fins C) jaws D) a well-developed notochord

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What causes the inactivation of a G protein?

A. The alpha subunit hydrolyzes GTP to GDP and inorganic phosphate. B. The beta and gamma subunits trigger the hydrolysis of GTP to GDP. C. A phosphatase removes the inorganic phosphate group from GTP. D. The inactive receptor catalyzes the replacement of GTP by GDP.

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Proper storage of cerebrospinal fluid (CSF) sent to the laboratory for bacterial culture includes:

a. refrigeration for up to 23 hours. b. freezing at 70°C. c. incubation at 35°C. d. freezing at temperatures above 70°C.

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In the periodic table, the value that refers to the number of protons and neutrons is:

A. atomic mass. B. molecular molarity. C. atomic molarity. D. molecular number.

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