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Q: Water moves molecules passively across a cell membrane by: a)osmosis
A:
Q: What structures are needed in a cell membrane to carry out facilitated diffusion?
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Q: d) hypertonic
A:
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Besides water, what is the most abundant component of a typical bacterial cell by weight?
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- Typically, our cells have a high concentration of sodium ions outside and a low concentration of sodium ions inside. Sodium ions continue to move out of the cell by the process of: a) secondary active transport b) pinocytosis c) facilitated diffusion d)simple diffusion e) primary active transport f) osmosisWhich is an example of passive transport? a) A membrane protein uses a hydrogen ion concentration gradient to transport sucrose against its concentration gradient and into a cell b) An ion channel permits sodium ions to diffuse through a cell membrane c) A pump uses ATP as an energy source to transport hydrogen ions out of a cell d) A cell takes in particles by pinocytosis e) The sodium potassium pump transports ions from one side of the membrane to the other, against a concentration gradientWater moves molecules passively across a cell membrane by: a)osmosis b)Facilitated diffusion c)Simple Diffusion d)Active
- Match the definitions with the words: Direct Diffusion, Facilitated Transport, Active Transport a) passive movement of molecules through a protein channel, down the solute's concentration gradient b) using a vesicle to move many molecules into a cell c) movement of molecules through a protein transporter, requires ATP, against the solute's concentration gradientIf magnesium ions are in higher concentration outside the cell, they would move into the cell by the process of: a) facilitated diffusion through a carrier protein b) osmosis c) secondary active transport d) facilitated diffusion through a channel protein e) exocytosis f) simple diffusion g) primary active transport16. Which of the following best defines the term "exocytosis"? A) The discharge of proteins in cytoplasmic vesicles from a cell following fusion of the vesicles with the plasmalemma B) Diffusion of lipid-soluble molecules from a cell across the cell membrane C) The uptake of material at one domain of a cell's surface and its discharge from the opposite side of the cell D) The discharge of ions or small molecules from a cell by protein pumps in the membrane E) The process by which proteins move from one cytoplasmic compartment to another
- Among the statements a, b and c, which is/are false? a) Endocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport inside the cell a small content of extracellular fluid. b) Exocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport a small amount of intracellular fluid out of the cell. c) Pinocytosis is a form of endocytosis. d) All of these statements are false. e) None of these statements is false.Receptor mediated endocytosis requires the presence of a) primary active transport pumps. b) D) carrier proteins that move molecules across the membrane into the cytosol. C) specialized proteins on the membrane surface.Which molecule(s) would be expected to diffuse into a cell using passive transport? A) Carbon dioxide B) Water C) Cholesterol D) Glucose E) All of these molecules could diffuse using passive transport.