The action of a new drug is unknown, so you test various aspects of eukaryotic cell processes looking for an effect. You notice that the survival of cells exposed to this drug is very low. Further analysis shows that some proteins and mRNAs are much longer than they should be. One hypothesis is that the drug interferes with
A) transcription termination signals.
B) spliceosome activity.
C) ribosomes.
D) nucleoli.
E) both choices A and B
E) both choices A and B
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The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of:
A. fatty acids. B. steroids. C. nucleotides. D. amino acids. E. water molecules.
A Weil-Felix test was performed on serial dilutions from a patient bitten by a tick. The results obtained were positive for OX-19 and negative for OX-2 and OX-K. Based on these findings, the organism can be identified as:
a. R. rickettsii. b. O. tsutsugamushi. c. Rickettsia prowazekii. d. Rickettsia typhi.
Give some examples of how humans thermoregulate. What will be an ideal response?
Which of the following hormones stimulates ovulation?
a. gonadotropin-releasing hormone b. luteinizing hormone c. follicle-stimulating hormone d. estrogen e. progesterone