Which of the following roles do B cells play?
A) antigen presentation
B) antigen processing
C) antigen uptake
D) antigen presentation, processing, and uptake
Answer: D
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Thermoplasma grows either aerobically or anaerobically by sulfur respiration
Indicate whether the statement is true or false.
Ice is less dense than water. This is significant in nature because:
1.The surface of a pond is colder than its depths since it has contact with air. 2.If ice formed from the bottom up, all aquatic life would die out each winter. 3.Water on top of ice would keep fish from their food source. 4.Ice could form at any time the temperature was below 32 degrees F.
True or false: tonicity describes the effect of a solution on the movement of water
a. true b. false
What are the two specific "conditions" within the definition of Osmosis that makes it different than simple diffusion?
a. movement of water; concentration gradient b. movement of water; through selectively permeable membrane c. movement of molecules; through selectively permeable membrane d. Brownian motion; Concentration gradient