What category of compounds helps our body fluids to stay within a consistent pH range?
a. solvents
b. buffers
c. solutes
d. acids
e. bases
ANSWER: b
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If you wanted to install lights to grow plants indoors, the type of light would you want to use is
A. gamma rays, because it has high energy wavelengths. B. visible light, because it has low energy wavelengths. C. microwaves, because it has low energy wavelengths. D. infrared, because it has high energy wavelengths. E. ultraviolet, because it has high energy wavelengths.
The receptors shown here are
a. mechanoreceptors. b. thermoreceptors. c. chemoreceptors. d. nociceptors. e. osmoreceptors.
________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.
A. Photosynthates B. Heat shock proteins C. Hormones D. Glycoproteins E. Pulvini
Which statement about diffusion is correct?
A) Diffusion causes movement of materials toward equilibrium. B) Diffusion of water cannot occur. C) Diffusion can occur only through a membrane. D) Diffusion requires a protein channel.