Approximately ____ of Earth’s total primary production is supplied by the ocean’s primary producers
a. one fourth
b. one third
c. half
d. three fourths
e. all
ANSWER: c
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Which of the following statements about root hairs is false? a. Root hairs increase surface area for absorption of water and mineral ions
b. Root hairs are small when young but will grow into larger roots. c. Root hairs live only a few days and then are replaced. d. Root hairs are fragile and only a few millimeters long.
What is the result when airborne sulfur and nitrogen oxides coat dust particles?
a. wet acid deposition b. dry acid deposition c. a chemical reaction that produces sulfuric and nitric acids d. wet acid deposition and increased soil pH when dust settles e. dry acid deposition and reduced soil pH when dust settles
In a physical map, distances are measured in
A) recombination frequencies. B) number of SNPs. C) base pairs. D) probabilities. E) microns.
Proton pumps within the electron transport chain transport H+ ions __________.
a. from intermembrane space to cytoplasm
b. from cytoplasm to matrix
c. from matrix to intermembrane space
d. from matrix to cytoplasm