What results from the use of atrazine, a pesticide hypothesized to be an endocrine disruptor?
A) increased metabolism in animals
B) the conversion of testosterone into estrogen
C) the masculinization of female ovaries
D) the loss of all sexual organs in frogs
B
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We have a family of genes that code for different forms of myosin. How different do you think these gene sequences are from each other?
A. completely different, no identical base sequences B. completely the same, identical base sequence C. some differences in sequence, some similarities
Intercalating agents, such as acridine orange, are mutagens because they
A) promote transitions. B) remove amine groups. C) attach to purines causing distortions. D) add ethyl or methyl groups. E) fit between stacked bases and disrupt replication.
Gross primary productivity refers to the total ____
a. quantity of solar energy available to the ecosystem in a given period of time b. quantity of solar energy reaching a given area of the ecosystem c. energy captured initially by the producers d. energy used by the heterotrophs of the ecosystem in a given period of time e. energy used by the producers for their growth and reproduction
Nearly all ________ are aquatic
A) crustaceans B) arachnids C) flatworms D) roundworms