People who wash their hands frequently during cold season typically have fewer colds than those who do not. This observation suggests cold viruses can be transmitted by
A. fomites.
B. mechanical vectors.
C. biological vectors.
D. direct contact.
E. both direct contact and fomites.
Answer: E
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What is the difference between the allosteric and torpedo models of eukaryotic transcritponal termination?
A. The allosteric model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the torpedo model is that the polymerase is physically removed from the DNA B. The torpedo model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the allosteric model is that the polymerase is physically removed from the DNA C. The allosteric model is that RNA pol II becomes destabilized after transcription of the stop codon sequence while the torpedo model is that the polymerase is physically removed from the DNA D. The torpedo model is that RNA pol II becomes destabilized after transcription of the stop codon while the allosteric model is that the polymerase is physically removed from the DNA E. The only difference between the two models is the proteins that are involved in removing the RNA pol II from the DNA
Choose the one most appropriate answer for each.
A. Endemic B. Extinct species C. D. Conservation biology E. Endangered species F. Ecological restoration G. Biodiversity hot spots H. Threatened species I. Biological magnification J. K. Bioaccumulation
Which of the following statements about phagocytic cells in animals is false?
(a) Phagocytic cells are important in the gut to take up large particles of food. (b) Phagocytic cells scavenge dead and damaged cells and cell debris. (c) Phagocytic cells can engulf invading microorganisms and deliver them to their lysosomes for destruction. (d) Phagocytic cells extend pseudopods that surround the material to be ingested.
All of the following are associated with subacute endocarditis, except:
A. it occurs in patients that have prior heart damage. B. it is caused by immune system autoantibodies that attack heart and valve tissue. C. oral bacteria get introduced by dental procedures to the blood. D. bacteria colonize previously damaged heart tissue resulting in vegetation. E. signs and symptoms include fever, heart murmur, and possible emboli.