n example of a signaling molecule that binds with a receptor on the cell surface is:
a. insulin.
b. ecdysone.
c. Vitamin D.
d. Vitamin A.
e. nitric oxide.
A
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How does an enzyme work to catalyze a reaction?
A. It raises the temperature of a reaction. B. It lowers the activation energy of a reaction. C. It allows the reaction to proceed through different intermediates. D. It supplies the energy to speed up a reaction. E. It increases the concentration of the reactants in a reaction.
Identify the key feature of the action potential that ensures it will travel only one direction.
A. the activation state of the voltage-gated Na+ channel B. the inactivation state of the voltage-gated Na+ channel C. the activation state of the voltage-gated K+ channel D. the inactivation state of the voltage-gated K+ channel E. the temporary cessation in activity of the Na+/K+ pump
A rapidly growing population is likely to have an age-structure diagram that is
a. bullet-shaped. b. in the shape of an inverted pyramid. c. shows significant bulges in the middle of the diagram. d. constantly changing its shape. e. in the form of a pyramid.
Which of the following are accessory pigments
in photosynthesis? a. carotenoids b. phycobillins c. anthocyanins d. chlorophyll b e. all of these