Which is true of simple diffusion of water?
A. Water usually enters a cell and produces a tremendous osmotic pressure.
B. Water usually leaves the cell and produces negative osmotic pressure.
C. Water tends to enter and leave the cell equally, resulting in no pressure in the cell.
D. The diffusion ultimately relies on the selectively permeable nature of the cell membrane.
E. Water usually enters a cell and produces a tremendous osmotic pressure AND the diffusion ultimately relies on the selectively permeable nature of the cell membrane.
E
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Which is the most common protein in the body?
a. muscle b. collagen c. hemoglobin d. bone matrix e. insulin
Communication between animals is
A. usually primarily instinctive. B. common between different species. C. primarily a learned activity. D. rare.
In order for a colony to be visible to the naked eye, about how many cells must be present?
a. 1,000,000 b. 100,000 c. 10,000 d. 1,000
Tay-Sachs disease results from the malfunction of
A) mitochondria. B) lysosomes. C) endoplasmic reticulum. D) nucleoli.