Which of the following is TRUE of both T cells and B cells?
A. They have class I MHC molecules on their cell surface.
B. They recognize specific antigens on the cell surface.
C. They are involved in the humoral immune response.
D. They are lymphocytes.
E. All of the responses are correct.
Answer: E
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Predict the outcome of protein synthesis if a gene undergoes a mutation in its anticodon region where a charged tRNA recognizes a nonsense mutation.
A. Transcription and translation both would not continue. B. Transcription would continue but translation would not continue. C. Transcription and translation both would continue. D. Transcription would continue but translation would not continue.
Most of the Earth’s phosphorous is in the form of ____
a. phosphoric acid b. elemental phosphorous c. phosphate d. phosphorous cations e. carbonate
Cholesterol affects the fluidity of membranes into which it inserts by
a. increasing membrane fluidity at all temperatures. b. decreasing membrane fluidity at all temperatures. c. decreasing membrane fluidity at high temperatures and increasing membrane fluidity at low temperatures. d. increasing membrane fluidity at high temperatures and decreasing membrane fluidity at low temperatures.
The length of daylight affects flowering, a process called
A. photoperiodism. B. gravitropism. C. thigmotropism. D. phototropism.