What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves?
A)
an electrogenic pump
B)
a proton pump
C)
a contransport protein
D)
A and C only
E)
A, B, and C
Answer: E
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Membrane Structure and Function
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- Familial hypercholesterolemia is characterized by which of the following?
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- An organism with a cell wall would have the most difficulty doing which process?
- Several seriously epidemic viral diseases of earlier centuries were then incurable because they resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatal because we have developed which of the following?
- Proton pumps are used in various ways by members of every kingdom of organisms. What does this most probably mean?
- The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on?
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- If a membrane protein in an animal cell is involved in the cotransport of glucose and sodium ions into the cell, which of the following is most likely true?
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- What is the voltage across a membrane called?
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- Which of the following membrane activities require energy from ATP hydrolysis?
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