Bacteria that normally live on or in the body and prevent other bacteria from becoming too numerous are referred to as ________
A) beneficial bacteria B) pathogens C) parasitic D) bacterial toxins
Answer: A
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Members of the subphylum include spiders, ticks, mites, scorpions, and horseshoe crabs. Their first
pair of appendages are fanglike structures used for biting prey, and their second pair of appendages, called pedipalps, are used for many different activities.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
The cell-mediated response involves all of the
following EXCEPT a. dendritic cells with antigen-MHC complexes. b. production of helper T cells. c. production of cytokines. d. production of cytotoxic cells. e. production of antibodies.
Of these fossil species, which one is thought most likely the ancestor of later species of Homo?
A. Homo ergaster B. Homo habilis C. Homo rudolfensis D. Homo sapiens
The stem-loop structure at the 3? end of a bacterial mRNA may function in
a. termination of translation. b. regulating the frequency of translation. c. regulating the frequency of transcription. d. mRNA stability. e. mRNA transport.