Phosphorous is usually assimilated by microorganisms as ________.
A. phosphate
B. polyphosphate (volutin)
C. elemental phosphate (Po)
D. phosphene
Answer: A
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What is the structural feature that allows DNA to replicate?
A) sugar-phosphate backbone B) complementary pairing of the nitrogenous bases C) disulfide bonding (bridging) of the two helixes D) twisting of the molecule to form an ?-helix E) three-component structure of the nucleotides
When sediment removal is less than input we often find:
a. fjords. b. tectonic estuaries. c. tidal flats. d. bar-built estuaries. e. drowned river valleys.
Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. What term describes this relationship?
A) commensalism B) competition C) predation D) parasitism
Arrange the following electron carriers in the electron transport chain, based on their standard reduction potentials.Cytochroms a3(Fe3+) + e? ? Cytochrome a3 (Fe2+) Eo (volts) = 0.35Ubiquinone + 2H+ + 2e? ? Ubiquinone H2 Eo (volts) = 0.10Cytochrome a (Fe3+) + e? ? Cytochrome a (Fe2+) Eo (volts) = 0.29Cytochrome c (Fe3+) + e? ? Cytochrome c (Fe2+) Eo (volts) = 0.25
A. cytochrome c - ubiquinone ? cytochrome a ? cytochrome a3 B. cytochrome a3 ? cytochrome a ? cytochrome c ? ubiquinone C. ubiquinone ? cytochrome a ? cytochrome a3 ? cytochrome c D. ubiquinone ? cytochrome c ? cytochrome a ? cytochrome a3