What is/are potential outcomes when a virus is phagocytosed and the phagocytic cell presents a small antigen fragment to naïve TH cells in association with Class II MHC molecules?
a) the production of antiviral antibodies
b) the proliferation of cytotoxic T cells
c) stimulate the production of memory T and B cells
d) two of the above
e) three of the above
Answer: e) three of the above
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Which of the following is the purpose of exocytosis?
a. Moving material out of a cell b. Transporting particles into a cell c. Forming intracellular vacuoles d. Obtaining solutes from extracellular fluid
A scientist studied DNA replication in a test tube. He added single-stranded DNA template strands, DNA polymerase, and radioactively-labeled nucleotides. After replication occurred, he tested the DNA to find out which strands now contained radioactive nucleotides. What is the best prediction of his results?
A) Only the template strands will contain radioactive nucleotides. B) Only the newly-synthesized strands will contain radioactive nucleotides. C) Both the template strands and the newly-synthesized strands will contain radioactive nucleotides. D) Neither the template strands nor the newly-synthesized strands will contain radioactive nucleotides
If an overlap develops between the ranges of two closely related species, and if the species occupy the same niche in the zone of overlap, what will probably happen in the zone of overlap?
A) A new species will arise by hybridization. B) Both species will coexist, provided the environment in the zone of overlap is different from that in either individual range. C) Both species will coexist, provided the environment in the zone of overlap is similar to that of one of the individual ranges. D) One species will take over most or all of the zone of overlap.
Dengue fever is spread by
a. female Anopheles mosquitoes. b. male Anopheles mosquitoes. c. Aedes aegypti mosquitoes. d. Ixodes ticks.