Water has a high heat capacity because it has ____
a. covalent bonds
b. ionic bonds
c. low freezing point
d. high boiling point
e. hydrogen bonds
ANSWER: e
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In dry shrublands
a. plants are adapted to episodes of fire. b. primary production is abundant throughout the year. c. there are constant cool temperatures throughout the year. d. winters are mild and summers are wet. e. precipitation occurs evenly year round.
Peripheral vasoconstriction is a response to
a. heat. b. hunger. c. cold. d. exercise. e. thirst.
A nucleotide is composed of a(n) _____.
a. glycerol, a nitrogen-containing base, and a five-carbon sugar b. amino group, a nitrogen-containing base, and a five-carbon sugar c. phosphate group, a nitrogen-containing base, and a hydrocarbon d. phosphate group, a nitrogen-containing base, and a five-carbon sugar e. sulfhydryl group, a nitrogen-containing base, and a five-carbon sugar
The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated.
b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system.
c. it confirmed that each cell of a given species contains the same amount of DNA.
d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria.
e. it demonstrated that mice can change the hereditary content of bacteria.