Because most herbivores do not produce cellulase, they have specialized compartments in their digestive tracts that (select all correct choices):
A. provide appropriate temperature and pH
for breaking down plant material.
B. house large populations of bacteria and
other single-celled symbionts that do produce
cellulase.
C. grind up the plant material using muscular
gizzards or other structures.
D. secrete alternative enzymes that carry out
the same function as cellulase.
E. ferment nutrients in the hindgut.
B
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A person who has two identical alleles for a particular gene is ________ for that gene.
A) dominant B) heterozygous C) homozygous D) positive
Why are roots essential for terrestrial plants?
A. They allow plants to obtain sun energy. B. Roots are not essential for plants, as plants can function without roots. C. They absorb carbon dioxide needed for photosynthesis. D. They absorb water and minerals needed for growth.
Advantages of the interferon-gamma release assay (IGRA) over the traditional TB skin test include all of the following except
A) IGRAs are sensitive enough to detect early cases of TB. B) IGRA can provide results within a day. C) IGRA requires only one patient visit as opposed to two with the skin test. D) IGRA only detects active TB infections. E) IGRA can be used on persons who have been vaccinated against TB.
A,C,G, and T represent the bases in RNA
a. true b. false