When the action potential begins, sodium gates open, allowing Na+ to cross the membrane. Now the polarity changes to
a. negative outside and positive inside
b. positive outside and negative inside
c. there is no difference in charge between outside and inside
d. any one of these could be correct
Answer: a. negative outside and positive inside
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A. true B. false
During anaphase II of meiosis,
A. the centrioles form. B. daughter cells form. C. chromosomes move to poles. D. chromatids exchange parts.
The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n)
A. repressor. B. operon. C. inducer. D. DNA-binding protein.
Chlorophyll molecules are embedded in the membranes of the ________
Fill in the blank(s) with the appropriate word(s).