Hormones alter cellular operations by ____________________.
modifying the rate of transcription of a particular enzyme
stimulating the synthesis of a specific protein
turning an existing enzyme on or off
Only A and B are correct
All choices are correct
All choices are correct
modifying the rate of transcription of a particular enzyme
stimulating the synthesis of a specific protein
turning an existing enzyme on or off
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The radial and ulnar veins merge to form the ________ vein.
A. axillary B. jugular C. brachial D. cephalic
Movement of a substance from an area of higher concentration to one where it is less concentrated is known as
A. equilibrium. B. active transport. C. diffusion. D. facilitation. E. selective transport.
Membrane-bound proteins that use metabolic energy to move ions across the plasma membrane are called
A) ion channels. B) ion pumps. C) peripheral protein pumps. D) peripheral protein channels. E) ion receptors.
When blood glucose levels rise,
A) insulin is released. B) glucagon is released. C) peripheral cells take up less glucose. D) protein synthesis decreases. E) peripheral cells break down glycogen.