The vertebrate group that describes all jawed vertebrates with two pairs of limbs is the
A) craniates.
B) amniotes.
C) tetrapods.
D) mammals.
Answer: C
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Smallpox is an enveloped virus with a DNA genome. We have eliminated this once deadly virus through an aggressive worldwide vaccination program. Why might a vaccine be successful with smallpox, but not with HIV?
A. DNA genomes mutate less rapidly than RNA genomes. B. Host cells have RNA in them, and thus do not raise antibodies against RNA. C. RNA is more stable than DNA, and is less likely to be destroyed by the vaccine. D. Viruses with DNA genomes must replicate inside a host cell. E. Smallpox is an enveloped virus.
Which region of the brain is responsible for
controlling reflexes such as swallowing, coughing, and sneezing?
a. midbrain b. pons c. thalamus d. medulla oblongata e. cerebrum
Which forms the outermost whorl of flower parts?
a. sepals b. petals c. anthers d. carpels e. stamens
Which of the following is not true concerning the large intestine?
a. It is also called the colon. b. It harbors beneficial bacteria. c. It is involved with the absorption of sodium. d. It is involved with the absorption of water. e. It secretes digestive enzymes.