Sodium-potassium pumps transport ___________.
A) sodium ions (Na+) and potassium ions (K+) into a neuron
B) sodium ions (Na+) and potassium ions (K+) out of a neuron
C) sodium ions (Na+) out of a neuron and potassium ions (K+) into a neuron
D) sodium ions (Na+) into a neuron and potassium ions (K+) out of a neuron
E) both sodium ions (Na+) and potassium ions (K+) into and out of a neuron
Answer: C) sodium ions (Na+) out of a neuron and potassium ions (K+) into a neuron
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Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What was the probability that Deirdre and Geoff's first child would express the albino trait?
A. 1/2 B. 3/4 C. 1/8 D. 1/4
The rate at which a population of a given species will increase when no limits are placed on its rate of growth is called its
A. maximum growth. B. carrying capacity. C. biotic potential. D. optimal growth.
Which of the following groups represents the MOST closely related organisms?
a. kingdoms b. species c. orders d. genera e. taxa
The net movement of substances to regions of lower concentration is called
A. facilitation. B. active transport. C. diffusion. D. osmosis.