Chromosomes are most easily identified in which mitotic stage?
a. prophase
b. metaphase
c. anaphase
d. telophase
e. cytokinesis
ANSWER: b
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Integral membrane proteins are differentiated from peripheral membrane proteins due to the fact that integral membrane proteins are ________ while peripheral membrane proteins are ________
a. entirely hydrophilic / entirely hydrophobic b. permanently attached to the bilayer / temporarily attached to one of the bilayer's surfaces c. temporarily attached to one of the bilayer's surfaces / permanently attached to the bilayer d. always either enzymes or receptors / always either active or passive transporters
Hyponatremia is a condition characterized by low sodium in the blood. This is a concern for marathon runners who drink too much water, and can cause life-threatening pressure on the brain. Why would this occur?
A. Neurons would take up the sodium from the blood and not be able to polarize. B. Neurons would be stimulated to all fire at once. C. Neurons would swell by osmosis. D. Neurons die in low levels of sodium. E. Neurons cannot give the kidneys signals to reabsorb sodium ions.
Explain how oogenesis is different from spermatogenesis. What will be an ideal response?
Electrolytes are critical for life for all of the following reasons EXCEPT which one?
a. They stabilize a variety of compounds. b. They act as electron carriers. c. They allow electrical gradients to exist within cells. d. All of the above are reasons why electrolytes are critical for life.