The function of pits in the walls of tracheids is:
A. allowing the passage of water
B. stopping backflow of water
C. secretion of resin
D. sealing off air bubbles
E. allowing the escape of air
A. allowing the passage of water
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The oxygen content of water increases linearly with an increase in oxygen partial pressure, while the oxygen content of blood increases in a sigmoidal (S-shaped) fashion. Why?
A) Carbonic anhydrase contributes to carbon dioxide release in blood, but not water. B) The Bohr shift is stronger in water than in blood. C) Hemoglobin shows cooperative oxygen binding. D) Oxygen is transported equally by hemoglobin and blood plasma.
The countervailing forces model:
A) depicts business as operating within a market environment, responding primarily to powerful economic forces. B) depicts the BGS relationship as a flow of interactions among the major elements of society. C) shows the corporation at the center of an array of mutual relationships with persons, groups, and entities called stakeholders. D) is depicted in a pyramidal, hierarchical image of society which primarily represents the perspective of business critics.
Features that contributed to success on land include a __________ and __________ that minimize
water loss. Fill in the blank(s) with the appropriate word(s).
Higher substitution rates are seen in ________ than in ________
A) coding regions, noncoding regions B) 5' flanking regions, 3' flanking regions C) first codon positions, second codon positions D) introns, exons E) charged amino acid codons, noncharged amino acid codons