What are the two passive forms of movement across a plasma membrane?
a. diffusion down a concentration gradient and movement along an electrical gradient
b. phagocytosis and movement along an electrical gradient
c. diffusion down a concentration gradient and pinocytosis
d. phagocytosis and osmosis
e. diffusion along an electrical gradient and osmosis
a
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Which one of the following is true?
A. Osteoclasts deposit bone matrix around themselves and become osteocytes when they are isolated in lacunae. B. Osteoblasts are large, multinucleated cells that break down calcified bone matrix. C. Osteoblasts deposit bone matrix around themselves and become osteocytes when they are isolated in lacunae. D. Osteoclasts secrete bone matrix and become osteoblasts.
Which one of the following is NOT true of the lungs?
A) The narrower portion of each lung is called the apex. B) The bases rest on the diaphragm. C) The left lung has two lobes. D) The right lung has three lobes. E) Both lungs have two lobes.
__________-gated ion channels open or close when a molecule such as a hormone or neurotransmitter binds to them.
Fill in the blank(s) with the appropriate word(s).
Which pair of chromosomes determines whether a child is male or female?
A. 22nd B. 23rd C. 21st D. 20th