Many ribosome-inactivating proteins are not a
problem for humans because
a. we have enzymes to detoxify them.
b. they are very rare in nature.
c. they are sequestered by white blood cells.
d. they are rapidly metabolized.
e. they do not cross cell membranes very well
E
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Ammonia, urea, and uric acid
A. are all nitrogenous wastes. B. all require large amounts of water for excretion. C. all require about the same amount of energy to produce. D. are all equally toxic. E. are all produced by the kidney.
Which ion is not transported out of the cells when a person has cystic fibrosis?
a. Nitrogen b. Hydrogen c. Sodium d. Potassium e. Chloride
The majority of the water in xylem sap typically
a. is used in capturing light energy. b. becomes part of new plant cells. c. is used to make sugars. d. is stored in older plant cells. e. evaporates into the air.
Carbohydrates have which one of the following characteristics?
A) They are composed of carbon, hydrogen, nitrogen, and oxygen. B) They release energy when their peptide bonds are broken. C) They are indigestible by most organisms. D) They contain carbon, hydrogen, and oxygen in a ratio of 1-2-1. E) They are able to store and transmit genetic information.