Genetic manipulation has been useful in restoring the numbers of __________ in the United
States.
a. black-footed ferrets
b. chestnut trees
c. California condors
d. Siberian tigers
B
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If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?
A) carbon dioxide B) cytokinins C) ethylene D) auxin E) gibberellic acids
Ionized ammonia applied to soil is effectively retained because clays in the soil have a charge that is ________.
A. uncharged B. negative C. positive D. None of these are correct.
Matthew has the inherited form of the eye cancer retinoblastoma (RB). His disease is caused by
A) a germline mutation in one RB allele and no mutation in the other allele. B) a somatic mutation in each copy of the RB gene in the same cell. C) a germline mutation in one RB allele and a somatic mutation in the other allele. D) a somatic mutation in one of the RB genes in the same area of the retina of one eye.
Which of the following breaks down the slowest during decomposition?
A) simple sugars B) cellulose C) chitin D) lignin