Killing of graft cells occurs through a complex series of mechanisms including
A. sensitized T cytotoxic cells.
B. NK cells.
C. erythrocytic cells.
D. basophilic cells.
E. sensitized T cytotoxic cells AND NK cells.
E
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Which of the following is the primary advantage of C4 plants over C3 plants?
A. C4 plants minimize photorespiration compared with C3 plants. B. C4 plants can produce sugars more efficiently than C3 plants under hot, arid conditions. C. C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants. D. Relative to C3 plants, C4 plants can keep their stomata closed more frequently to limit water evaporation, yet can still produce significant CO2 needed for sugar production. E. All of the choices are correct.
Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol. 2. Diffusion is the movement of a molecule from an area of high to low concentration. 3. Osmosis describes the movement of water from an area of high to low solute concentration. 4. Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.
Which of the following is a reason that pollinators ARE considered keystone species?
a. many plant species rely on insects to successfully reproduce b. pollinators maintain the integrity and productivity of natural communities c. pollinators are a critical link in the food chain d. pollinators have complex social structures and division of labor e. pollinators are not considered to be keystone species
Water follows sodium ions out of the renal filtrate in the tubules and into blood by means of
A. osmosis. B. glomerular filtration. C. tubular secretion. D. tubular reabsorption.