One of the important neurotransmitters that is altered by a variety of drug addictions such as cocaine and some other conditions is

a. dopamine.
b. acetylcholine.
c. protease.
d. THC.
e. ATP.


A

Biology & Microbiology

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Most organisms are dependent upon plants

because

a. plants produce oxygen as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. as they remove carbon dioxide from the atmosphere, they reduce the problems generated by the greenhouse effect. e. all of these apply

Biology & Microbiology

In Meselson and Stahl's experiment, what kind of DNA molecules would be found after four replication cycles?

A) Only heavy DNA (15N-15N) B) Only intermediate DNA (15N-14N) C) Only light DNA (14N-14N) D) Both heavy (15N-15N) and light DNA (14N-14N) E) Both heavy (15N-15N) and intermediate DNA (15N-14N)

Biology & Microbiology

Dominant alleles are always the most common alleles in a population.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Which of the following is not considered a basic tissue type?

A. connective B. epithelial C. nervous D. muscle E. fat

Biology & Microbiology