The accumulation of amino acids and sugars in animal cells can occur through
A. proton pumps.
B. ATP pumps.
C. glucose pumps.
D. sodium-potassium pumps.
E. coupled transport.
Answer: E
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Which of the following best describes the characteristics of the ascending arm of the loop of Henle? (Select all correct choices.)
A. It is permeable to water. B. It actively transports electrolytes. C. It is impermeable to water. D. Its filtrate is mainly urea. E. Its filtrate becomes more and more concentrated.
What structure cements plant cells together?
A. middle lamella B. hemidesmosomes C. plasmodesmata D. primary cell walls E. adherens junctions
Seagrasses are important in all the following except:
a. nutrient recycling. b. providing a habitat for animals. c. stabilizing sediments. d. being consumed by most estuarine herbivores.
In humans, the male has an X and a Y sex chromosome. The human female has two X chromosomes. In birds, the female has a Z and a W sex chromosome while the male has two Z chromosomes. Which of the following statements is accurate about which parent determines the gender of the offspring based on inheritance of the necessary sex chromosome?
A. In humans, the female determines the gender of the offspring, and in birds the male determines the gender. B. In humans and birds, the female determines the gender of all the offspring. C. In humans and birds, the male determines the gender of all the offspring. D. Determination of the gender of any human or bird offspring is related to the environmental conditions at the time of conception. E. In humans, the male determines the gender of the offspring, and in birds the female determines the gender.