Compare the leakage rates of sodium and potassium into and out of a neuron at rest. How is the relationship between these rates best described?
A. Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron.
B. Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.
C. Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron.
D. Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron.
E. Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron.
Answer: D
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A. are complexes of ribosomes and RNA. B. are self-catalytic RNA. C. suggest that nucleic acids evolved before proteins. D. are enzymes that degrade RNA and therefore have potential for clinical applications. E. are self-catalytic RNA AND suggest that nucleic acids evolved before proteins.
The middle ear consists of the cochlea and vestibular apparatus.
a. true b. false
What is one difference between polyploidy and aneuploidy?
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Whisk ferns, club mosses, and horsetails have all the following characteristics in common with ferns except:
A. all of these plants are seedless tracheophyte plants. B. all of these plants produce flagellated sperm. C. all of these plants form antheridia and archegonia. D. all of these plants require free water for the process of fertilization to occur. E. all of these plants have no vascular tissue.