Which group includes mammals, birds, and reptiles but excludes all other chordates?
A. Vertebrates
B. Amniotes
C. Tetrapods
D. Monotremes
E. Deuterostomes
B. Amniotes
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A polymerase chain reaction (PCR) copies an individual gene segment in vitro with a(n) ________ primer(s)
A) individual RNA B) individual DNA C) pair of RNA D) pair of DNA
The macromolecules responsible for bacterial adherence that are NOT covalently attached to bacteria are collectively called
A) lipid A. B) biofilms. C) capsules. D) glycocalyx.
The clonal selection theory implies that
A. related people have similar immune responses. B. antigens activate specific lymphocytes. C. only certain cells can produce interferon. D. memory cells are present at birth. E. the body selects which antigens it will respond to.
In hominid evolution, which came first?
A. larger arms B. bipedalism C. bigger feet D. large brains