A reason given by scientists as to why viruses are not considered living organisms is that
A. viruses can be frozen and still survive.
B. viruses do not reproduce on their own.
C. viruses are all smaller than the smallest known cells.
D. viruses do not contain a nucleus.
E. viruses do not contain genetic information.
B. viruses do not reproduce on their own.
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The removal of a phosphate group during an enzyme-catalyzed reaction takes ____
a. 1012 years b. about 10 milliseconds c. about 1021 milliseconds d. more time than for an uncatalyzed reaction e. less time at 1000oC than at 100oC
Plasma in a blood vessel is separated from cells by interstitial fluid
Indicate whether the statement is true or false.
Airways of the mammalian respiratory system function to
a. filter oxygen from carbon dioxide. b. moisten external air. c. cool external air. d. filter water out of the air. e. keep water out of the lungs.
Which of the following prokaryotes aid digestion in cattle, deer, and other animals that obtain nutrition from cellulose?
A) halophiles B) dinoflagellates C) methanogens D) cocci