In water, NaOH almost completely separates into Na+ and OH- ions. Thus, NaOH is _____
a. a strong acid
b. a strong base
c. a weak acid
d. a weak base
e. neutral
B
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The prefrontal area of the human frontal lobe is an association area that is most responsible for human brain's ability to carry out which three functions?
A. formulating appropriate behaviors B. critical thinking C. regulating hunger, thirst, and sleep D. coordinating muscle movements E. reasoning
Which of these plant tissue types is composed of cells with primary walls thickened at the corners that provide support for immature parts of the cell body?
A. collenchyma B. phloem C. sclerenchyma D. xylem E. parenchyma
You put a solution of sucrose into a bag of dialysis tubing, which is permeable to water but not to sucrose. You then put this bag into a beaker of water. An hour later, you observe that the bag has swelled due to
A. the pressure exerted on the bag by the surrounding water. B. the osmotic pressure of the sucrose solution. C. the high osmolarity of the surrounding water. D. passive transport of sucrose molecules. E. active transport of water molecules.
Members of the genus Mycoplasma are pleomorphic and stain Gram-negative because they
A. lack cell walls. B. have sterols in their cytoplasmic membranes. C. lack cytoplasmic membranes. D. have mycolic acid in their cell walls. E. have a rudimentary cell wall.