Which of the following statements about drugs that competitively inhibit DNA polymerase or RNA polymerase is FALSE?
A) They can potentially cause mutations.
B) They are used against viral infections.
C) They can affect host cell DNA synthesis.
D) They cause cellular plasmolysis.
E) They interfere with protein synthesis.
D
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The proportion of the air we breathe accounted for by oxygen is approximately
A. 21%. B. 1%. C. 5%. D. 50%. E. 78%.
Specimens are prepared for ________ microscopy using electron-dense stains
A) atomic probe B) bright-field C) confocal D) transmission electron E) scanning tunneling
When was the human genome officially sequenced?
a. 1975 b. 2003 c. 1989 d. 1953 e. 2001
When you hold your breath, which of the following blood gas changes leads initially to the urge to breathe again?
A) rising carbon monoxide level B) rising carbon dioxide level C) falling carbon monoxide level D) rising carbon dioxide level and falling carbon monoxide level