When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the solution does not
change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to
this same solution. Based on these observations, the compound Na2HPO4 is:
a. acting as a buffer.
b. acting as a solvent.
c. able to donate hydrogen atoms to HCl.
d. able to remove hydrogen ions from the OH? of NaOH.
e. an enzyme facilitating the reaction between HCl and NaOH.
a
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This material provides a mechanism for the maintenance of normal human skin that prevents drying and also is involved in the production of an acid pH to prevent the colonization of poten-tially pathogenic organisms
a. sweat b. bacterocins c. antibodies d. sebum
The Calvin cycle is sometimes referred to as the C3 pathway because it generates a single three-carbon molecule for
every three turns of the cycle.
a. True b. False
Which of the following statements about primates is true?
a. Prosimians are typically nocturnal. b. Prosimians are larger than anthropoids. c. Prosimians have larger brains than anthropoids. d. Prosimians include monkeys, apes, and lemurs.
A result is statistically significant if
a. it is unlikely to have occurred by chance. b. it is likely to have occurred by chance. c. it is likely to have occurred in 50% of the cases. d. it is consistent with predictions. e. it is widely accepted.