Which of the following is not a typical occurrence in the history of a transposon's appearance in an organism?
A. Transposons could be dispersed to a new host cell by conjugation, viral infection, or accidental uptake of DNA by the cell.
B. After its introduction into the new host cell, the transposon is likely to experience a period of high transposition activity. This activity is unlikely to be detrimental to the host cell.
C. After introduction into the new host cell, the transposon is likely to increase its copy number.
D. Eventually, the transposon becomes subject to silencing processes including mutations in the transposase gene.
E. The host may find a way to shut down transposition. One common method is RNA interference.
B
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The yield of ATP per glucose molecule in fermentation is ____
a. 2 b. 6 c. 12 d. 36 e. 40
Which of the following statements concerning bacterial growth at low temperatures is not true?
A) Low temperatures slow growth of cells B) Low temperatures reduce the rate of chemical reactions C) Low temperatures decrease the rate at which nutrients cross the cell membrane D) Low temperatures destroy lipids that make up the cell membrane E) Low temperatures reduce the fluidity of the cell membrane
The neuron transport proteins that maintain the resting membrane potential are ____.
A. sodium-phosphorus passive transporters B. sodium-potassium pumps C. sodium-chlorine gated channels D. phosphorus-calcium pumps E. phosphorus-chlorine gated channels
Hypertension is caused by all of the following EXCEPT ________.
Fill in the blank(s) with the appropriate word(s).