Parkinson's disease involves low levels of _____

a. acetylcholine (ACh) c. serotonin
b. dopamine d. endorphins


B

Biology & Microbiology

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An undifferentiated cell of a zygote is known as:

A. a stem cell. B. a single-celled organism. C. a feeding cell. D. a reproducing cell.

Biology & Microbiology

The equation, C6H12O6 + 6O2 ? 6CO2 + 6H2O (ATP + Heat), describes which of the following processes?

A. photosynthesis B. cell respiration C. cell fermentation D. glycolysis E. anaerobic metabolism

Biology & Microbiology

Each cell carries out __________ tasks that keep it

alive. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly

A. stimulating components of the immune system through the release of cytokines. B. stimulating the production of specific antibodies. C. blocking or reducing the inflammation response in mucous membranes. D. recruiting macrophages to the nasal epithelium. E. lysing virus-infected cells and preventing further propagation of the pathogen.

Biology & Microbiology