Transcription factors generally "read" DNA sequences through amino acid–nucleotide contacts in the major groove because:
A. there are no minor groove hydrogen bond acceptors available at A–T base pairs.
B. the minor groove displays only methyl functional groups for recognition.
C. there are more hydrogen bond donors and acceptors in the major groove.
D. all minor groove functional groups are the same.
C
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The size of sediment particles on sandy beaches will influence the following characteristic of the beach:
a. porosity. b. oxygen content. c. food content. d. rate of water drainage. e. all of the above.
The various flower parts are attached to the
a. style. b. receptacle. c. stigma. d. filament. e. calyx.
Vocal signals are used by _____
a. wolves b. mice c. snakes only d. lizards only e. snakes and lizards
Bordetella pertussis causes disease by
A) the development of pneumonia. B) interfering with the action of the ciliated epithelial cells of the trachea. C) suppressing the production of mucus by the respiratory lining. D) forming a pseudomembrane that obstructs the larynx. E) irritating the diaphragm, which leads to severe coughing attacks.