Which most completely describes the circumstances under which yarrow will alter its phenotype?
A. Temperature, soil conditions, and water conditions
B. Soil conditions only
C. Being produced by sexual versus asexual reproduction
D. Water conditions only
E. Asexual reproduction, soil conditions, and water conditions
Answer: A
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Place the following events involved in drug addiction in the correct sequence.
I-The synapse becomes less sensitive, and normal function can only continue in the presence of the drug. II-CNS responds to increased firing by decreasing the number of drug receptors on the cell membrane. III-Drug molecule prevents receptor endocytosis and causes overstimulation of the postsynaptic cell. A. I, II, III B. III, II, I C. II, III, I D. III, I, II
How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
A) Trp binds to and inhibits the repressor, thus allowing transcription of the operon. B) Trp binds to and activates the repressor, which then binds to DNA to allow transcription of the operon. C) Trp binds directly to DNA and inhibits transcription of the operon. D) Trp binds to and changes the conformation of the repressor, which can then bind DNA and block transcription of the operon.
E. O. Wilson coined the term ________ for our innate appreciation of wild environments and living organisms
A) bioremediation B) bioethics C) biophilia D) biophobia