The Oxidase Test is used to determine which of the following characteristics of a bacterium?
A. Whether the bacterium is a gram-positive or a gram negative
B. Whether the bacterium is a sacchrolytic or asacchrolytic
C. If the bacterium is an obligate aerobe or a facultative anaerobe
D. Whether the bacterium utilized the oxidative or fermentative pathway in glycolysis
E. none of the above
Ans: E. none of the above
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Evidence that black walnut trees exhibit allelopathy includes
A. the lack of vegetation growing under black walnut trees. B. the death of hornworms that try to eat black walnut leaves. C. the symbiotic relationship the trees have with fungi. D. the ants that protect the trees from herbivory. E. the morphological changes that occur in response to pathogenic attacks.
In the testcross Aa Bb × aa bb, what proportion of individuals are expected to be homozygous for both genes in the F1 generation?
A) 1/4 B) 1/2 C) 3/4 D) All are homozygotes. E) None are homozygotes.
The portion of a flower that receives the pollen is the
A. ovary. B. anther. C. stigma. D. style. E. sepal.
The boreal forests of North America are dominated by ____
a. spruce, fir, and pine b. redwoods and sequoia c. birch and aspen d. long-leaf and loblolly pines e. cedars and junipers