The neuron transport proteins that maintain the
resting membrane potential and restore ion gradients
following an action potential are
a. sodium-phosphorus passive transporters.
b. sodium-potassium pumps.
c. sodium-chlorine gated channels.
d. phosphorus-calcium pumps.
e. phosphorus-chlorine gated channels.
Answer: b
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A cell in G2 before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has
A. twice as much DNA and twice as many chromosomes B. four times as much DNA and twice as many chromosomes C. twice as much DNA but the same number of chromosomes D. four times as much DNA and four times as many chromosomes E. twice as much DNA and half as many chromosomes
Where did Earth's atmosphere originate?
a. Earth's gravity trapped gases from passing comets. b. Gases were released from Earth itself as it cooled. c. Earth’s gravity trapped gases from Earth itself. d. Earth’s gravity trapped gases from passing comets, gases were released from the Earth itself as it cooled, and Earth’s gravity trapped gases from the Earth itself. e. Gases were released from Earth itself as it cooled Earth’s gravity trapped gases from the Earth itself.
Which of the common molecules normally found in the body plays a role in the aging process,forming irreversible cross-linkages between proteins, and contributing to the stiffness and loss of elasticity we may experience with aging?
a) glucose b) phospholipids c) water d) NaCl e) ATP
Overall brain size across mammals (e.g., an elephant vs. a bat) is a good predictor of behavioral complexity.
Answer the following statement true (T) or false (F)