____________ provide(s) both structural support and the enzymes needed to make proteins from amino acid building blocks.
A) peroxisomes
B) Golgi apparatus
C) ribosomes
D) mitochondria
Answer: C) ribosomes
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What process(es) is(are) used by the cells of the proximal convoluted tubule to return substances to the blood?
A. Water movement by osmosis B. Movement of sodium, glucose, and other nutrients by transporters C. Passive transport of chloride ions D. All apply.
Which of the following types of tracts are used to conduct nerve impulses between gyri within the same cerebral hemisphere?
a) Association tracts b) Commissural tracts c) Projection tracts d) Mammillothalamic tracts e) Stria medullaris
Schwann cells differ from oligodendrocytes in which of the following ways?
A. Schwann cells form myelin; oligodendrocytes do not. B. Oligodendrocytes are only found in the PNS; Schwann cells are only found in the CNS. C. Schwann cells form sheaths around several axons, while oligodendrocytes form sheaths around only one axon. D. Schwann cells form a myelin sheath around a portion of only one axon, while oligodendrocytes can surround portions of several axons. E. None of these choices are true differences.
Peptide hormones are
A) composed of amino acids. B) produced by the adrenal glands. C) derived from the amino acid tyrosine. D) lipids. E) chemically related to cholesterol.