Stratospheric ozone is important because it:
a. traps reradiated heat from Earth.
b. prevents heat penetration from the sun.
c. replenishes the surface ozone layer.
d. dissipates the surface ozone layer.
e. blocks solar UV radiation.
e
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Which of the following does not reflect the action of an effector molecule on the transcription of a gene?
A. An effector binds to a repressor to decrease the level of transcription. B. An effector binds to a repressor to increase the level of transcription. C. An effector binds to an activator to increase the level of transcription. D. An effector binds to a polymerase to increase the level of transcription.
Approximately what percentage of the human genome encodes proteins?
a. 1 b. 3 c. 5 d. 15 e. 50
How many electrons does one atom of carbon share to complete its valence shell?
A) 2 B) 3 C) 4 D) 8
The ________ bases in DNA are adenine, cytosine, guanine and thymine.
Fill in the blank(s) with the appropriate word(s).