Which of the following probably influenced Darwin the most when he was developing his theory of evolution?
a. catastrophism
b. uniformitarianism
c. Scala Naturea
d. vestigial structures
Ans: b. uniformitarianism
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Companion cell assisted loading of organic
compounds is indicated at a. A. b. B. c. C. d. D. e. E.
If you looked at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?
A) They appear to have a cell wall. B) They lack a nucleus. C) They are oblong in shape. D) They form a colony.
TLRs are
A) phagocyte receptors that detect PAMPs. B) the coatings of pathogens by complement. C) molecules that damage cells, resulting in cell lysis. D) present in intact skin, sebum, tears, etc. E) nonspecific leukocytes that secrete toxins onto the surface of virally infected cells.
How does lambda phage solve the problem of replicating the ends of its linear genome?
a. Its genome is circularized for replication. b. A protein binds to the terminus to facilitate replication. c. There are complementary repeats at each end that serve as templates for each other. d. Additional repeat units are added at the terminus to allow replication. e. A crosslink structure is formed at the terminus to avoid its having a free end.