All of the following are criteria by which a species may be defined EXCEPT
A. the ability to reproduce.
B. possession of a shared gene pool.
C. ability to hybridize through interbreeding.
D. reproductive isolation.
E. the ability to produce fertile offspring.
Ans: D. reproductive isolation.
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The term axenic is used to describe a(n)
A) anaerobic culture. B) anoxygenic culture. C) nutritionally deficient culture. D) pure culture.
In some instances environmental change causes a situation where one phenotype is favored for a period of time, and then a different phenotype is favored. This oscillating selection causes
A. the maintenance of genetic variation in the population. B. an increase in point mutations. C. elimination of rarer genotypes because of uneven selection. D. extinction of the population. E. high population increase to maintain phenotypic variation.
Shitake mushrooms are decomposers that break down biological molecules from dead organisms. These organisms
belong to the ____ kingdom.
a. Protist b. Animalia c. Bacteria d. Fungi e. Plantae
Crop sunflowers are attacked by many fungal pathogens, such as downy mildew and Sclerotinia, resulting in economic losses of millions of dollars per year. What genes would be best to target for the development of new fungus-killing crop treatments (fungicides)?
A. genes encoding chitin proteins that are shared by downy mildew and Sclerotinia, but absent in sunflower and humans B. genes encoding metabolite proteins that are shared by downy mildew, Sclerotinia, and humans, but absent in sunflower C. genes encoding basic development proteins that are shared by downy mildew, Sclerotinia, sunflower, and humans D. genes encoding growth proteins that are shared by downy mildew, Sclerotinia, and sunflower, but absent in humans