Steroid hormones _________.
a. bind to a receptor inside the target cell
b. are made from cholesterol
c. cause the cell to make new proteins
d. all of these
Ans: d. all of these
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What is a population's carrying capacity?
A. Its density-independent growth B. Its maximum population size to remain stable C. Its exponential growth over time D. Its minimum population size to avoid extinction
A former patient calls, hoping to locate x-rays taken more than five years ago. What should you say?
What will be an ideal response?
Which of the following statements is true?
a. Although hormones are carried to all parts of the body, they produce effects only in cells with proper receptors. b. Hormones are limited to steroid compounds. c. Hormones are secreted by specialized exocrine glands. d. Most hormones are controlled by positive feedback mechanisms involving the pituitary gland. e. Target cell response to the secretion of a hormone is as rapid as an effector response in the nervous system.
The leaves of plants can be thought of as "eating" sunlight. From an energetic perspective this makes sense because:
a. light energy, like chemical energy released when the bonds of food molecules are broken, is a type of kinetic energy. b. the carbon-oxygen bonds within a photon of light release energy when broken by the enzymes in the chloroplasts. c. both light energy and food energy can be converted to kinetic energy without the loss of heat. d. photons are linked together by hydrogen bonds, which release energy when striking the surface of a leaf. e. the carbon-hydrogen bonds within a photon of light release energy when broken by the enzymes in the chloroplasts.