Who was/were the first to propose that cell membranes are phospholipid bilayers?
A) H. Davson and J. Danielli
B) I. Langmuir
C) C. Overton
D) S. Singer and G. Nicolson
E) E. Gorter and F. Grendel
Answer: E
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Membrane Structure and Function
- Based on Figure 7.19 in your textbook, which of these experimental treatments would increase the rate of sucrose transport into the cell?
- Which of the following processes includes all others?
- Which of the following factors would tend to increase membrane fluidity?
- According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly
- In what way do the membranes of a eukaryotic cell vary?
- In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?
- The difference between pinocytosis and receptor-mediated endocytosis is that
- Familial hypercholesterolemia is characterized by which of the following?
- White blood cells engulf bacteria through what process?
- 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?
- What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves?
- Ions diffuse across membranes down their
- The movement of potassium into an animal cell requires
- 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?
- The sodium-potassium pump is called an electrogenic pump because it
- In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by
- What is the voltage across a membrane called?
- Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?
- What are the membrane structures that function in active transport?
- Which of the following membrane activities require energy from ATP hydrolysis?
- When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?
- In which of the following would there be the greatest need for osmoregulation?