Which of the following statements about veins is false?
A. Veins located in the head, limbs, and lower
body have one-way valves that help prevent
blood from pooling due to gravity.
B. The blood pressure within the veins is
much lower than the blood pressure within
the arteries.
C. Veins have thinner walls than arteries.
D. As much as 80% of the total blood volume
resides in the venous circulation at any given
time.
E. None of the answer options is false.
A
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Molecular homology can be compared by analyzing the
A. sequences of amino acids of various proteins in different species. B. elemental makeup of different species. C. positions of genes on the chromosomes of different species. D. vestigial structures of different species. E. protein structure during development.
How does gene flow affect the genetic composition in populations?
A. Gene flow promotes genetic diversity by introducing new alleles into populations. B. Gene flow tends to make the allele frequencies in neighboring populations more similar to each other. C. Gene flow promotes genetic diversity by introducing new alleles into populations and gene flow tends to make the allele frequencies in neighboring populations more similar to each other. D. Gene flow promotes genetic similarities by removing alleles from a population.
In a neuron at rest, which of the following is TRUE?
A. Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron. B. Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron. C. Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron. D. Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. E. Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.
The membrane potential (resting potential) is largely set by the Na-K-ATpase pump.
a. true b. false