High energy sources on early Earth, which were most likely involved in the origin of life, included:a
volcanic activity, lightning, and ultraviolet radiation.
b. bombardment from meteorites, gamma radiation, and cosmic radiation.
c. intense radiation, volcanic activity, and redox energy.
d. oxidizing environment, electrical discharge, and geothermal energy.
e. infrared radiation, ultraviolet radiation, and oxidizing radiation.
A
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Lamellipodia are formed by:
A. the contraction of myosin and actin. B. the polymerization of actin microfilaments. C. the polymerization of microtubules. D. the disassembly of intermediate filaments.
In which of the following regions in the host bacterium are you most likely to find Bdellovibrio?
A. The cytoplasm B. The nucleoid C. The cell nucleus D. The space between the cell wall and plasma membrane
By the end of the fourth week the embryo is
____ times larger than its starting size.
a. 100 b. 200 c. 300 d. 400 e. 500
Regulatory proteins can identify specific sequences on the DNA double helix without unwinding the helix. This is accomplished by inserting
A. DNA polymerase into the major groove of the double helix where the edges of the nitrogen bases protrude. B. RNA promoters into either the major groove or the minor groove of the double helix where the edges of the nitrogen bases protrude. C. DNA-binding motifs into the major groove of the double helix where the edges of the nitrogen bases protrude. D. RNA polymerase into the major groove of the double helix where the edges of the nitrogen bases protrude. E. DNA-binding motifs into the minor groove of the double helix where the edges of the nitrogen bases protrude.