Abscission of fruits and leaves is controlled by
a. abscisic acid.
b. ethylene.
c. gibberellin.
d. auxin.
e. cytokinin
B
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The ultimate source of energy for humans comes from what source?
A. The sun B. Plants C. Water D. Air E. Animals
Which major checkpoint delays the cell cycle when DNA replication is incomplete?
A. G1 checkpoint B. G2 checkpoint C. M checkpoint D. G1, G2, and the M checkpoints E. None of the checkpoints delay the cell cycle when DNA replication is incomplete.
Among the easiest of the mutations to isolate are those which
A. involve haploid chromosomes. B. involve antibiotic resistance. C. allow populations to be measured. D. use an indirect method for measurement. E. involve haploid chromosomes AND involve antibiotic resistance.
"Blood is thicker than water" is a true statement since blood contains many components that are more dense than water.
Indicate whether the statement is true or false.