The sodium-potassium pump is called an electrogenic pump because it _____
A) pumps equal quantities of Na+ and K+ across the membrane
B) contributes to the membrane potential
C) ionizes sodium and potassium atoms
D) is used to drive the transport of other molecules against a concentration gradient
B
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Primary productivity on land is affected by _____
a. nutrient availability c. temperature b. amount of sunlight d. all of these
Glucose and fructose
a. form rings with the same number of carbon atoms. b. both have an oxygen atom as part of their ring structure. c. are alike in that both have identical functional groups. d. contain the same number of hydrogen atoms and hydroxyl groups. e. are disaccharides.
Explain the relationship between carrying capacity and limiting factor in regard to population growth. Relate this to
the S-shaped logistic growth curve. What will be an ideal response?
Which of the following T cells are mismatched with their functions?
A. Cytotoxic T cells - destroy non-self proteins B. Helper T cells - secrete cytokines to control immune responses C. Memory T cells - mediate apoptosis D. All of the choices are correctly matched with their functions.