If a double-stranded DNA molecule is like a twisted rope ladder with handrails and steps, what would the steps in the ladder represent?
A) phosphate groups
B) sugar (deoxyribose) molecules
C) nitrogenous bases
D) DNA polymerase
C
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The cochlear branch of the vestibulocochlear nerve is made up of:
A. hair cell axons from the basilar membrane. B. hair cell axons from the semicircular canal. C. bundles of hair cell bodies from the basilar membrane. D. bundles of hair cell bodies from the tectorial membrane.
Electrons lost by chlorophyll are replaced by electrons donated from:
a. NADPH b. sunlight c. water d. carbon dioxide e. ATP
The reason that many plasmids used in laboratories for transformation experiments contain an ampicillin resistance gene (ampR) is
A) so that the plasmid can replicate in bacterial cells. B) so that the plasmid can recombine with the bacterial genome. C) to enable the recipient cell to conjugate. D) to provide a selectable marker. E) to map point mutations.
Found in the nucleus, a _______ is an association of DNA and proteins.
a) cell plate b) ribosome c) chromosome d) centromere