The membrane's permeability to sodium ions is at its maximum at label _____
A) A
B) B
C) C
D) D
E) E
Answer: B
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What characterizes terrestrial tetrapods?
A) Lives on land, has four limbs B) Lives on land, has four sets of chromosomes C) Lives on land, has four cranial nerves D) Lives in the water, has four limbs
Isotopes are unstable and dissipate radioactive energy because they _____________
A. contain additional electrons in the electron orbital B. contain additional protons in the nucleus C. contain additional neutrons in the nucleus D. do not contain enough electrons in the electron orbital E. do not contain enough protons in the nucleus
Amphibians are not especially successful land-dwellers because of their
A) two-chambered hearts. B) production of a shelled amniotic egg. C) lungs that are supplemented by air sacs. D) reliance on moist skin for gas exchange. E) choice of prey.
A botanist who wants to stimulate flower formation in response to light cues could treat the plants with
A) cytokinin. B) abscisic acid. C) florigen. D) auxin. E) ethylene.