Which structure associated with the human heart contains oxygen-rich blood?
a. right atrium
b. right ventricle
c. pulmonary artery
d. aorta
e. superior vena cava
ANSWER: d
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Sodium ions are single atoms. Why can't they simply diffuse through the cell membrane's lipid bilayer?
A. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump. B. Sodium ions are covalently attached in groups of three, which are too large to diffuse easily. C. Ions do traverse the membrane easily, but the sodium-potassium pump moves them back across. D. Chelator proteins capture any ions that start to cross the bilayer.
Which of the following is NOT an advantage of
asexual reproduction? a. Asexual reproduction is more efficient than sexual reproduction. b. Individual organisms do not have to seek mates. c. Asexual reproduction promotes variation. d. Asexual reproduction is less energetically costly than sexual reproduction. e. In stable environments the offspring are as well adapted as the parents.
Positron Emission Tomography utilizes ____ to yield results of a scan
a. tracers b. x-rays c. neutrinos d. photons e. mesons
An acid dissociates in water to release
A) hydrogen ion(s). B) cation(s). C) hydroxyl group(s). D) anion(s). E) both anions and hydrogen ions.