In order to study a cell at lower temperatures, a researcher must artificially increase its membrane fluidity. What would be a reasonable strategy for increasing plasma membrane fluidity at low temperatures?
A. decrease the composition of cholesterol in the plasma membrane
B. increase the composition of phospholipids with saturated fatty acid chains
C. decrease the composition of phospholipids with unsaturated fatty acid chains
D. decrease the length of the phospholipid fatty acyl tail.
E. All of the above strategies are reasonable
D. decrease the length of the phospholipid fatty acyl tail.
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Antidiuretic hormone (ADH) functions at the cellular level by _____
A) stimulating the reabsorption of glucose through channel proteins B) triggering the synthesis of an enzyme that makes the phospholipid bilayer more permeable to water C) causing membranes to include more phospholipids that have unsaturated fatty acids D) causing an increase in the number of aquaporin molecules of collecting duct cells E) decreasing the speed at which filtrate flows through the nephron, leading to increased reabsorption of water
What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have tropchophore larvae. B. They shed their exoskeletons. C. They all have spiral cleavage. D. They all have segmentation.
Movable bones are found in the
a. cochlea. b. external ear. c. middle ear. d. inner ear. e. organ of Corti.
A storm strips an island in Lake Superior down to bare rock. The first organisms to recolonize the island are most likely
A) blueberries. B) balsam firs. C) junipers. D) yarrow. E) lichens.