Of the enzymes associated with the metabolism of lactose with the lac operon, the one associated with transport of lactose into the cell is
A) ?-galactosidase.
B) transacetylase.
C) galactoside permease.
D) ?-lactase.
E) lactose translocase.
C) galactoside permease.
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At what stage(s) is carbon dioxide needed in photosynthesis?
A. At the very beginning of the light reactions B. At the end of the light reactions C. During both the light reactions and the Calvin cycle D. During the Calvin cycle
Why is oxygen toxic to strict anaerobes?
What will be an ideal response?
The light sensor in a Chlamydomonas cell allows it to sense both light direction and light intensity. What do we call this light sensor?
a. a vacuole b. an eye c. a spot d. an eyespot
In some social insects, there are individuals that do not mate or may not be fertile but help look after other members of their group. Which statement regarding this situation is true?
A) Natural selection cannot act on the genes of nonreproducers since they do not leave offspring. B) The ultimate cause of this behavior is the need to keep their group safe. C) By protecting relatives, the nonreproducers increase the probability that their genes will be passed to the next generation. D) Lack of mating is an agonistic behavior.