Once an action potential is triggered, there is a
A) reversal of the membrane polarity, with the interior of the cell becoming positively charged.
B) reversal of the membrane polarity, with the interior of the cell becoming negatively charged.
C) sudden rush of potassium into the neuron.
D) sudden impermeability of the membrane to the transport of ions.
Answer: A
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Which of the following is incorrect about archaeal translation?
A. Archaeal translation is coupled to transcription, similar to bacterial processes. B. Archaeal translation uses 70S ribosomes, similar to bacterial ribosomes. C. Archaeal translation may recognize ribosome binding sites homologous to bacterial Shine-Dalgarno sequences. D. Archaeal translation uses no chaperone proteins for folding new polypeptides.
The female gonads are the
A) ovaries. B) oocytes. C) uterus. D) labia.
Which of the following choices represents an informal grouping of anaerobic chemoautotrophs that form ATP by removing electrons from hydrogen gas or acetate?
a. extreme thermophiles b. extreme halophiles c. acidophiles d. methanogens
What is the osmolarity of fresh water?
a. about 5 mOsm/L b. about 225 mOsm/L c. about 300 mOsm/L d. about 1500 mOsm/L