A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?
a. 23 or 46, depending on the portion of prophase examined
b. 46 or 92, depending on the portion of prophase examined
c. 23
d. 92
e. 46
Answer: c. 23
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A. water moves from extracellular to intracellular compartments. B. water moves from a region of high water concentration to a region of low water concentration. C. solutes move from a region of low water concentration to a region of high water concentration. D. solutes move from a region of high solute concentration to a region of low solute concentration. E. plasma membranes must be impermeable to water.
Which structures are the primary cellular sites for the production of polypeptide chains?
a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. smooth endoplasmic reticula
A region where neurotransmitter molecules
stimulate a neuron is indicated by a. A. b. B. c. C. d. D. e. none of these
Mycoplasmas are bacteria that lack cell walls.
a. true b. false