The most complete fossil skeleton of an
australopith is that of
a. Australopithecus afarensis.
b. Australopithecus africanus.
c. Australopithecus habilis.
d. Australopithecus sebida.
e. Australopithecus garhi
A
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You isolate a plant that expresses a phytochrome mutant that is always in the
Pfr form. You expect these plants will germinate A. not at all. B. regardless of the light conditions. C. later than normal plants. D. similarly to normal plants.
Why do scientists hypothesize that RNA was the first form of genetic material?
A. RNA can store genetic information and form membranes. B. RNA can store genetic information. C. RNA can catalyze reactions. D. RNA can catalyze reactions and store genetic information. E. RNA can catalyze reactions and form membranes.
Which is not true of the cell cycle?
(a) the cell cycle is controlled by internal/external signals (b) Cyclin is a signaling molecule that increases and decreases as the cycle continues (c) DNA damage can stop the cell cycle at the G1 checkpoint (d) Apoptosis occurs frequently during the cell cycle
There is a mutation in the operator of the trp operon in a cell such that the trp repressor is unable to bind to the operator. If tryptophan is added to the cell, what will happen?
A) Tryptophan will bind to the repressor, and trp enzymes will be produced. B) Tryptophan will bind to the repressor, and trp enzymes will not be produced. C) Tryptophan will not bind to the repressor, and trp enzymes will be produced. D) Tryptophan will bind to the operator, and trp enzymes will be produced.