Which of the following statements about abscisic acid are true? Check all that apply.
_____It is produced chiefly in mature green leaves and in fruits.
_____ It stimulates the growth of dormant buds.
_____It promotes leaf senescence.
_____It plays an important role in controlling the opening and closing of stomata.
_____It plays a role in seed dormancy.
__X__ It is produced chiefly in mature green leaves and in fruits.
_____ It stimulates the growth of dormant buds.
__X__ It promotes leaf senescence.
__X__ It plays an important role in controlling the opening and closing of stomata.
__X__ It plays a role in seed dormancy.
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Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.
Which of the letters in the above figure represents
the ovule? a. A b. B c. C d. D e. none of these
What gas do plants release during photorespiration?
A) water vapor B) oxygen C) carbon dioxide D) carbon monoxide
MacConkey agar plates represent ________ medium
A) a minimal B) a selective C) a differential D) both a differential and a selective E) both a minimal and a selective