Choose the true statements about molecular clocks.
_____ All molecular clocks tick at the same rate.
_____ Molecular clocks can be calibrated using fossil evidence.
_____ The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection.
_____ Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms.
_____ All molecular clocks tick at the same rate.
__X__ Molecular clocks can be calibrated using fossil evidence.
__X__ The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection.
__X__ Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms.
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The blood vessels of the umbilical cord are formed by which extraembryonic membrane?
a. yolk sac b. chorion c. allantois d. amnion e. placenta
Systolic pressure reflects the
A. contraction of the atria. B. relaxation of the atria. C. contraction of the ventricles. D. relaxation of the ventricles. E. heart rate.
As part of your fitness training, you do biceps curls lifting two 10-lb weights. The muscle contractions enabling these movements are
A) isometric contractions. B) tetanic contractions. C) isotonic contractions. D) tendon-mediated contractions. E) ligament-mediated contractions.
Mature human neuron (nerve) cells and muscle cells
A) become cancerous more easily than other cell types. B) continue to divide throughout their lifetime. C) are permanently in a state of nondivision. D) cease dividing after a predetermined number of cell generations.