Mutagens and carcinogens are associated with
A. transposon activity.
B. induced mutations.
C. spontaneous mutations.
D. None of the above.
Answer: B
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Which one of the following terms applies to the phylum Platyhelminthes?
A. radial cleavage B. protostome C. diploblastic D. acoelomate E. radial symmetry
Lamarck argued that long-legged wading birdsare descended from short-legged ancestors that stretched their legs to
stay dry while feeding in shallow water, and consequently produced offspring with slightly longer legs. Which mechanism did he use to support this argument?
a. principle of use and disuse b. theory of catastrophism c. inheritance of acquired characteristics d. natural selection e. evolution of vestigial structures
Night blindness and skin problems are due to a deficiency of ____
a. vitamin D b. vitamin E c. calcium d. vitamin A e. thiamin
Water moves through a plant by each of the following methods except
A. through the Casparian strip. B. through the spaces between cells. C. from cell to cell across plasma membranes. D. through vessel members. E. from cell to cell through plasmodesmata.