Taking into account the enzymes produced by the koala's digestive tract and the enzymes produced by the symbiotic microbes present in the caecum, koalas are least able to digest
a. lignin.
b. starch.
c. cellulose.
d. protein.
e. fats and oils.
A; The enzymes needed to digest fats, proteins, and starches are produced in all mammals (choices c, d, and e) and the koala will have these as well. The koala has symbiotic microbes that help it digest cellulose. Lignin, however, is a large complex molecule that can be digested by only a few rare microbes. The koala can digest a small amount of lignin, but most of the energy of this molecule is wasted, as far as the koala is concerned.
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If the United States exports wheat to foreign countries that levy tariffs on wheat imports, the probable result is that the price of wheat will
a. fall in foreign countries. b. rise in the United States. c. rise in foreign countries. d. rise faster in the United States than in foreign countries.
A —COOH group is a(n) _____ group
a. carboxyl b. hydroxyl c. amino d. methyl e. carbonyl
Which of the following is NOT an advantage of
sexual reproduction? a. It offers an alternative adaptation in a changing environment. b. It is adaptive in coevolution situations. c. It is energetically costly. d. The genetic variation it provides may be useful in the future. e. It yields offspring with novel combinations of traits.
the light-dependent reactions
What will be an ideal response?