Meselson and Stahl showed that DNA is replicated by a __________.
a) conservative model
b) semi-conservative model
c) dispersive model
d) semi-dispersive model
e) conservative model in prokaryotes and semi-conservative model in eukaryotes
Ans: b) semi-conservative model
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Which of the following is not caused by Haemophilus influenzae?
What will be an ideal response?
Which of the following is a region of DNA at the end of a linear chromosome?
A. Primer B. Telomere C. Intron D. Exon
You are dispatched to a residence for a 50-year-old woman with respiratory distress. While you are assessing the patient, she tells you that she began experiencing flulike symptoms 4 days ago, shortly after delivering mail on the rural mail route for which she is responsible. Due to her illness, she has been unable to return to work. Her blood pressure is 90/50 mm Hg, pulse rate is 120 beats/min, and respirations are 26 breaths/min and labored. Auscultation of her breath sounds reveals the presence of coarse crackles. This patient has MOST likely been exposed to:
A) anthrax. B) smallpox. C) a neurotoxin. D) botulinum toxin.
Mammals such as the vampire bat have the ability to generate a urine with a concentration of approximately 3,600 milliosmoles (mOsm). If the concentration of their blood is approximately 300 mOsm, by producing a concentrated urine, their water loss is
A. Actually increased by approximately ½. B. Reduced by approximately ½. C. Reduced by approximately 11/12. D. Reduced by approximately 5/6. E. Not reduced.