Acetylcholine is a 

A. neurotransmitter.
B. hormone.
C. synthetic drug.
D. pigment.


A. neurotransmitter.

Biology & Microbiology

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The concept of a membrane as a fluid mosaic reflects the ability of ________

A) phospholipids and most proteins to drift about in the plane of the membrane B) phospholipids but not proteins to drift about in the plane of the membrane C) most proteins but not phospholipids to drift about in the plane of the membrane D) carbohydrates to drift into and out of the membrane structure

Biology & Microbiology

If a patient is missing B and T cells, what would be absent from the immune response?

A) memory B) lysozymes C) cytokines D) defense against bacteria

Biology & Microbiology

Which of the following proteins-functions is mismatched?

A. DNA polymerase-DNA synthesis B. DNA polymerase-primer removal and replacement with DNA C. DNA primase-production of RNA primer D. topoisomerase-separates double-stranded DNA into single strands E. single-stranded binding proteins-prevents single DNA strands from reforming into a double helix

Biology & Microbiology

Chorionic villi contain

a. germ cells. b. lymphatic vessels. c. endometrial cells. d. blood vessels. e. the allantois.

Biology & Microbiology