Individuals using drugs such as cocaine over extended periods of time find that they need increasing amounts just to feel okay. Why?

What will be an ideal response?


Drugs such as cocaine reduce the number of dopamine receptors and increase the number of dopamine pumps.

Biology & Microbiology

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Which one of the following best describes genotype-by-environment interaction?

A. Genetic and environmental factors combine to influence phenotype. B. The genotype of an organism determines how that organism will behave in its environment. C. The environment of an organism determines the genetic make-up of that organism. D. Under certain circumstances, two organisms with identical genotypes have different phenotypes. E. Under certain circumstances, two organisms with identical phenotypes have different genotypes.

Biology & Microbiology

Which three types of proprioceptors will be stimulated when you are riding a bicycle?

a. muscle spindles, mechanoreceptors, and thermoreceptors b. mechanoreceptors, interoceptors, and lateral line organs c. muscle spindles, Golgi tendon organs, and joint receptors d. lateral line organs, Golgi tendon organs, and mechanoreceptors e. interoceptors, joint receptors, and lateral line organs

Biology & Microbiology

The process in which RNA is synthesized using a DNA template is called translation

__________________ Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following is an exergonic reaction?

a. folding laundry b. synthesizing a protein c. burning wood for a campfire d. building a tower out of blocks

Biology & Microbiology