Temperature extremes, lack of water, and other environmental stresses trigger an increase in ____ synthesis, release,
and transport, which helps the plant survive the adverse conditions.
a. cytokinin
b. gibberellin
c. auxin
d. abscisic acid
e. ethylene
ANSWER: d
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The selective permeability of a membrane refers to the ____
a. movement of a molecule from an area of high concentration to an area of low concentration b. ability of a substance to pass through any membrane c. ability of only certain molecules to pass across a membrane d. need for carrier proteins to transport some molecules across a membrane e. ability of molecules to be transported across a membrane
Skeletal muscles are connected to bones by cords of connective tissue called
a. muscle fibers. b. sarcomeres. c. tendons. d. ligaments. e. myofibrils.
In eukaryotic cells, transcription cannot begin until
A. several transcription factors have bound to the promoter. B. the 5' caps are removed from the mRNA. C. DNA nucleases have isolated the transcription unit. D. the two DNA strands have completely separated and exposed the promoter. E. the DNA introns are removed from the template.
The enzyme responsible for separating the DNA strands during DNA replication is (topoisomerase/primase/helicase)
What will be an ideal response?