Acetylcholine is a
A. neurotransmitter.
B. hormone.
C. synthetic drug.
D. pigment.
A. neurotransmitter.
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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
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
Chorionic villi contain
a. germ cells. b. lymphatic vessels. c. endometrial cells. d. blood vessels. e. the allantois.
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