The nitrogenous base that is only found in RNA and not DNA is:
A. adenine
B. cytosine
C. uracil
D. guanine
E. thymine
C. uracil
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The results of an experiment
(a) don’t have to be repeatable. (b) should be repeatable by the investigator. (c) should be repeatable by other investigators. (d) must be both b and c.
Transport of two different substances can be linked. If the transport is in the same direction it is called ________; if the transport is in opposite directions it is called ________.
Fill in the blank(s) with the appropriate word(s).
Gametangia are
a. chlorophyll-producing structures. b. sex organs. c. a name for colony-forming algae. d. found in slime molds.
The risk of developing cancer can be decreased by:
a. increasing the amount of nitrates in the diet. b. exposing questionable tumors to x-rays. c. increasing the amount of unprocessed fruits in the diet. d. examining the breasts and testes every two years. e. exposing neoplasms to UV radiation