Osmosis is the diffusion of
A. water within the inside of a cell.
B. water across a membrane.
C. solutes within the inside of a cell.
D. solutes across a membrane.
B
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Which of the following correctly describes the structural organization of the cell membrane?
A. Rigid layers of protein molecules in which carbohydrate molecules are suspended B. A bilayer of phospholipid molecules in which protein molecules are embedded and can move C. A solid, rigid layer of phospholipid with loosely bound protein molecules D. Three layers; lipid on the inside, protein in the middle, and carbohydrates (and polysaccharides) on the outside
Embryonic development begins with
A. the third week and lasts until the end of the second month. B. the third day and lasts until birth. C. fertilization and lasts until the end of the first week. D. the second week and lasts until the end of the seventh month.
A chemical produced in a cell that activates specific processes in response to a hormone interaction with a membrane-bound receptor is referred to as a/an ________.
A. messenger RNA B. hormone response element C. intracellular mediator D. transcription factor
The genotype WW is best described as
A. homozygous recessive. B. homozygous dominant. C. heterozygous dominant. D. heterozygous recessive. E. homorecessive.