Earth is essentially a closed system with respect to ____
a. energy
b. matter
c. oxygen
d. photosynthesis
e. ecosystems
ANSWER: b
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By one estimation, the gross global ecosystem valuation is approximately ____
a. equivalent to the total carbon dioxide processed by all ecosystems b. equivalent to the total amount of carbon fixed c. $18 billion per year d. $18 trillion per year e. $18 million per year
A fossil whose age is determined by radiometric dating would be considered very old if only the smallest amount of radioactivity remained
Indicate whether the statement is true or false
How are the nucleotide monomers connected to form a polynucleotide?
a. hydrogen bonds between complementary nitrogenous base pairs. b. ionic attractions between phosphate groups c. disulfide bridges between cysteine amino acids. d. covalent bonds between the sugar of one nucleotide and the phosphate of the next e. ester linkages between the carboxyl group of one nucleotide and the hydroxyl group on the ribose of the next
Bacteria that divide in multiple planes and form grapelike clusters are called
a) streptococci. b) staphylococci. c) coccobacilli. d) vibrios.