Psychoactive drugs may act by altering the concentration of neurotransmitters in the brain.
a. true
b. false
Answer: a. true
Biology & Microbiology
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Most enveloped viruses use the host ________ membrane as their envelope source.
A. mitochondrial B. plasma C. nuclear D. none of these
Biology & Microbiology
Which of the following epithelial tissues secretes mucous and is dense with cilia?
A. cuboidal B. squamous C. simple D. stratified E. pseudostratified columnar
Biology & Microbiology
Which of the following is a nonrenewable resource?
a. copper and gold b. fresh water c. forests d. grasslands e. fish
Biology & Microbiology
Chlorosis is a plant condition referring to the:
A. localized death of tissues B. yellowing of leaves C. stunted growth of stems and leaves D. development of tumors E. healing of wounds
Biology & Microbiology