Which of these bonds are weak individually but are much stronger as a group?
A.
Covalent
B.
Ionic
C.
Neutron
D.
Hydrogen
E.
Ionic AND Hydrogen
E
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The biome at the top of a very high mountain at the
equator is a type of a. alpine tundra. b. taiga. c. savanna. d. mountain coniferous forest. e. arctic tundra
Four of the five answers listed below are targets of the immune system. Select the exception
a. virus b. normal cells c. cancer cells d. bacteria e. debris and dead cells
Which statement about radioisotopes is FALSE?
a. Potassium-40 has an extremely long half-life. b. Carbon-14 is typically used to date sedimentary rock. c. The ratio of carbon-14 to carbon-12 is used in dating fossils. d. The half-life of a radioisotope does not vary with temperature or pressure. e. The nucleus of a radioisotope can change into that of a different element during decay.
The following are all functions of a typical plasma membrane except:
A. expression of cellular identity B. selective transport of certain molecules and material C. reception of information D. transport of water and bulk material E. Be permanent in composition