Some prokaryotes attach to other substrates by hairlike outgrowths, which are shorter than flagella. These are called
A. flagellin.
B. endospores.
C. plasmids.
D. pili.
E. fission products.
Answer: D
Biology & Microbiology
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The only class of antibody that can cross the placenta is
A. IgA. B. IgD. C. IgG. D. IgE.
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A hominid of Europe and Asia that became extinct
nearly 30,000 years ago was a. a dryopith. b. Australopithecus. c. Homo erectus. d. Homo neanderthalensis e. Homo floresiensis.
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Cytosine and thymine are the two types of bases found in DNA known as ______________________. Fill in the blank(s) with the appropriate word(s)
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Mutation as a force in genetic diversity serves to
A. increase genetic diversity. B. rapidly change allele frequencies. C. maintain a genetic equilibrium. D. work against selection. E. do none of these.
Biology & Microbiology