Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Cell encapsulation wikipedia , lookup
Extracellular matrix wikipedia , lookup
Cellular differentiation wikipedia , lookup
Cell culture wikipedia , lookup
Signal transduction wikipedia , lookup
Cell growth wikipedia , lookup
Organ-on-a-chip wikipedia , lookup
Cytokinesis wikipedia , lookup
Cell membrane wikipedia , lookup
Chapter 5 Cell Membrane Structure and Function Active Lecture Questions Copyright © 2011 Pearson Education Inc. Which of the following is nonpolar? 1. 2. 3. 4. Fatty acid tails Water channels Water Phospholipid heads Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which of the following is nonpolar? 1. 2. 3. 4. Fatty acid tails Water channels Water Phospholipid heads Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The term “fluid mosaic model” refers to: 1. An experiment that shows the function of the cell membrane. 2. The dynamic flow of proteins and lipids within the membrane. 3. The cell membrane’s ability to communicate with the fluid portions of the cell. 4. The cell’s ability to communicate with the fluid portions of the membrane. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The term “fluid mosaic model” refers to: 1. An experiment that shows the function of the cell membrane. 2. The dynamic flow of proteins and lipids within the membrane. 3. The cell membrane’s ability to communicate with the fluid portions of the cell. 4. The cell’s ability to communicate with the fluid portions of the membrane. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. An organism living at the equator has more saturated phospholipids in its cell membranes than an organism living at the South Pole. Why? 1. In cold climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 2. In cold climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 3. In warm climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 4. In warm climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. An organism living at the equator has more saturated phospholipids in its cell membranes than an organism living at the South Pole. Why? 1. In cold climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 2. In cold climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 3. In warm climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 4. In warm climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The phospholipid tails of the membrane face one another because: 1. 2. 3. 4. They are hydrophilic—repelled by water. They are hydrophobic—attracted to water. They are hydrophilic—attracted to water. They are hydrophobic—repelled by water. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The phospholipid tails of the membrane face one another because: 1. 2. 3. 4. They are hydrophilic—repelled by water. They are hydrophobic—attracted to water. They are hydrophilic—attracted to water. They are hydrophobic—repelled by water. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which of the following is NOT a function of cell membrane proteins? 1. To move hydrophilic substances across the plasma membrane 2. To communicate with other cells 3. To isolate the inside of the cell from the outside 4. To identify cell type Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which of the following is NOT a function of cell membrane proteins? 1. To move hydrophilic substances across the plasma membrane 2. To communicate with other cells 3. To isolate the inside of the cell from the outside 4. To identify cell type Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which is NOT a form of active transport? 1. 2. 3. 4. Pinocytosis Receptor-mediated transport Phagocytosis Osmosis Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which is NOT a form of active transport? 1. 2. 3. 4. Pinocytosis Receptor-mediated transport Phagocytosis Osmosis Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which cell has the highest surface area/volume ratio? 1. 2. 3. 4. A cell with a radius of 10 units A cell with a radius of 20 units A cell with a radius of 50 units A cell with a radius of 100 units Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which cell has the highest surface area/volume ratio? 1. 2. 3. 4. A cell with a radius of 10 units A cell with a radius of 20 units A cell with a radius of 50 units A cell with a radius of 100 units Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. A semipermeable membrane separates two solutions, permitting water, but not larger molecules, to pass. Side A contains a 20% sugar solution. Side B contains a 40% sugar solution. At equilibrium, what condition is true? 1. 2. 3. 4. Side A will be hypertonic to side B. Side A will be hypotonic to side B. Side A will be isotonic to side B. Side B will be hypotonic to side A. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. A semipermeable membrane separates two solutions, permitting water, but not larger molecules, to pass. Side A contains a 20% sugar solution. Side B contains a 40% sugar solution. At equilibrium, what condition is true? 1. 2. 3. 4. Side A will be hypertonic to side B. Side A will be hypotonic to side B. Side A will be isotonic to side B. Side B will be hypotonic to side A. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which membrane process requires molecules to bind to a membrane protein? 1. 2. 3. 4. Water movement through channels Oxygen diffusion through the membrane Receptor-mediated transport Lipid movement across membranes Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which membrane process requires molecules to bind to a membrane protein? 1. 2. 3. 4. Water movement through channels Oxygen diffusion through the membrane Receptor-mediated transport Lipid movement across membranes Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Facilitated diffusion uses what kind of protein? 1. 2. 3. 4. Recognition Enzyme Attachment Carrier Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Facilitated diffusion uses what kind of protein? 1. 2. 3. 4. Recognition Enzyme Attachment Carrier Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The salt concentration of the fluid surrounding a cell is more concentrated than the fluid inside the cell. The cell will: 1. 2. 3. 4. Shrink. Swell. Stay the same. Transport salt into the cell. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. The salt concentration of the fluid surrounding a cell is more concentrated than the fluid inside the cell. The cell will: 1. 2. 3. 4. Shrink. Swell. Stay the same. Transport salt into the cell. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. What type of cell junctions are needed for a tissue that must prevent fluids from leaking across its cell layer? 1. 2. 3. 4. Desmosomes Tight junctions Gap junctions Plasmodesmata Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. What type of cell junctions are needed for a tissue that must prevent fluids from leaking across its cell layer? 1. 2. 3. 4. Desmosomes Tight junctions Gap junctions Plasmodesmata Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. In active transport, the energy source that moves a molecule against its concentration gradient is: 1. 2. 3. 4. Glucose. NADPH. NADH. ATP. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. In active transport, the energy source that moves a molecule against its concentration gradient is: 1. 2. 3. 4. Glucose. NADPH. NADH. ATP. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Animal cells communicate with one another through: 1. 2. 3. 4. Desmosomes. Tight junctions. Gap junctions. Plasmodesmata. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Animal cells communicate with one another through: 1. 2. 3. 4. Desmosomes. Tight junctions. Gap junctions. Plasmodesmata. Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which of the transport processes in the figure below results in the movement of molecules from a high to a low concentration? 1. 2. 3. 4. Only a Only c a and c a, b, c, and d Figure 5-7 Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. Which of the transport processes in the figure below results in the movement of molecules from a high to a low concentration? 1. 2. 3. 4. Only a Only c a and c a, b, c, and d Figure 5-7 Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. In the figure below, what is the correct association? 1. Trunk lipids: high fatty acid fluidity 2. Trunk lipids: unsaturated fatty acids 3. Leg lipids: low fatty acid fluidity 4. Leg lipids: unsaturated fatty acids Figure E5-1 Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc. In the figure below, what is the correct association? 1. Trunk lipids: high fatty acid fluidity 2. Trunk lipids: unsaturated fatty acids 3. Leg lipids: low fatty acid fluidity 4. Leg lipids: unsaturated fatty acids Figure E5-1 Biology: Life on Earth, 9e Copyright © 2011 Pearson Education Inc.