The attenuated oral poliovirus vaccine, (OVP), is no longer administered in the U.S.A. because it
A) is very toxic.
B) does not provide good immunity.
C) can revert to wild-type virulence.
D) can be spread to contacts.
E) can be spread to contacts and can revert to wild-type virulence.
E
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The part of the brain that connects the spinal cord with the forebrain is the:
a. cerebrum b. pons c. cerebellum d. fissure of Rolando e. hypothalamus
In genetically altered mice, genes are transferred by injection into ____________________ that are
____________________ into a foster mother. Fill in the blank(s) with the appropriate word(s).
A duplicated chromosome consists of two ________
A) centromeres B) centrosomes C) genomes D) sister chromatids
Cephalosporins and penicillins act on the cross-linkages in peptidoglycan. This usually results in
A) membrane breakdown. B) cell lysis. C) gram-positive cells becoming gram-negative. D) inhibition of protein synthesis.