Which of the following methods of enumerating cells is the only one to detect live cells?
A. direct microscopic count
B. viable plate count
C. turbidity
D. coulter counter
E. flow cytometer
Ans: B. viable plate count
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If a hypocotyl does not elongate during seed germination and early seedling growth, where will the cotyledons be?
A) above ground and above the seed B) above ground and below the seed C) in the ground with the seed coat
Male orgasm is necessary for
a. ejaculation of semen. b. pregnancy. c. erection. d. sexual arousal. e. all of these.
For the following list of anti-HIV drugs and their mechanism of action, identify the mismatch.
A. AZT (azidothymidine); as an analog of thymidine, it is incorporated into viral RNA in place of thymidine B. Protease inhibitor; blocks the active site of the protease required for assembling new viral particles. C. Reverse transcriptase inhibitor; blocks the active site of the enzyme required to convert viral RNA to DNA D. Integrase inhibitor; blocks the active site of the enzyme required to splice HIV DNA into the human genome
____ is(are) NOT directly involved with transcription.
A. Unzipping enzymes B. RNA polymerase C. Amino acids D. DNA