1. Passive transport of molecules is determined by the concentrations gradient of such molecules A. True B. False 2. Plasmalemma is the same as the plasma membrane A. True B. False 3. Phospholipids are always oriented so that their polar head faces the calcium ions A. True B. False 4. Which of these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeability 5. Which of these is not true about enzymes? A. Most of them are proteins B. Are changed at the end of the reaction C. Can only speed up the rate of the reaction D. Very specific in function E. Work better in specific medium

1. Passive transport of molecules is determined by the concentrations gradient of such molecules A. True B. False 2. Plasmalemma is the same as the plasma membrane A. True B. False 3. Phospholipids are always oriented so that their polar head faces the calcium ions A. True B. False 4. Which of these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeability 5. Which of these is not true about enzymes? A. Most of them are proteins B. Are changed at the end of the reaction C. Can only speed up the rate of the reaction D. Very specific in function E. Work better in specific medium

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 1TAHL: Which of the following methods of transport is being used to transfer the substance into the cell in...

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What variable(s) influence(s) whether a nonpolar molecule can move across a membrane by passive diffusion? a. The structure of the phospholipids bilayer b. The difference in concentration of the molecule across the membrane c. The presence of transport proteins in the membrane d. All of the choices are correct.
9)Two solutions are separated by a selectively permeable membrane that is not permeable to glucose. On one side of the membrane, solution A contains 10 percent glucose and on the other side, solution B contains 25 percent glucose. Which of the following is true? Select one: a. Solution A is hypertonic. b. The solutions are isotonic. c. Water would move from solution A to solution B. d. Glucose would move from solution B to solution A.
A blood cell with a 2% internal solute concentration is placed in a solution that has a 0.2% solute concentration. The solute is impermeable to the plasma membrane. How would you classify the solution compared to the cell – hypotonic, hypertonic or isotonic? Why? (2 pts.) B) Will the solutes move across the membrane? Why or why not? C) What type of transport would occur in this situation – diffusion, facilitated diffusion, osmosis, active transport or bulk transport. Explain. D) What would happen if the cell began to produce a new membrane protein that allowed the solutes to freely move in across the membrane? ould this change your answer to Part C? Explain.
which of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to water
1)What is the second type of lipid that plays a major role in the plasma membrane? This lipid does not have polar and nonpolar regions (its not amphiphilic) but plays a critical role in membrane permeability. A)Triglycerdies B) Steriod hormones c) cholesterol 2) In _______________, a single substrate/solute move from a high concentration area to a lower concentration are without the aid of any additional molecules. A) Diffusion B)Facilitated diffusion C) Cotransport 3)Channel proteins require a confirmational change in order to properly function. A) Hydrophilic B) ionic C) Polar
Which of the following statements is true of membrane proteins? a) They are suspended on the surface of the membrane. b) They are partly embedded in the bilayer c) They span across the bilayer and project from both sides d) Any of these are true, depending on the specific membrane protein.
Which of the following factors would tend to increasemembrane fluidity?(A) a greater proportion of unsaturated phospholipids(B) a greater proportion of saturated phospholipids(C) a lower temperature(D) a relatively high protein content in the membrane
a. Define diffusion. Is diffusion a passive or an active process? Explain how solute moves in this way. b. Use your knowledge of diffusion to explain what happened over time when you observed a crystal of methylene blue dropped into a beaker of water. Be sure to use equilibrium in your explanation. c. Explain your observations over time after a drop of methylene blue and a drop of potassium permanganate were placed in the agar. What factors affect the rate of diffusion? d. What are tissues? Name the four major types of tissues in the human body. e. Name the three primary germ layers. Name the primary germ layers from which epithelial tissues and connective tissues develop. f. List general characteristics that all epithelial tissues have in common. g. Name the functions of epithelial tissue. Which type of epithelial tissue is found in areas that need protection? h. Know how to identify simple squamous epithelium, simple cuboidal epithelium, simple columnar…
1) Draw a model of the plasma membrane to form a cell. Include a tube embedded in the membrane. Show 2 water molecules inside the cell and 12 water molecules outside the cell. Indicate which way the water will move through the aquaporin with an arrow. a) Using your knowledge of membrane transport, which direction will the water molecules move through the aquaporin? Why? b) Why would water have a difficult time crossing the cell membrane? Keep in mind the structure of water in your answer. 2) Develop an explanation for the necessity of having kinks in the hydrophobic tail of the phospholipids that make up cell membranes. a) Develop an explanation for the necessity of having kinks in the hydrophobic tail of the phospholipids that make up cell membranes.
The extracellular matrixa. assists in the movement of substances across the plasmamembrane.b. prevents the loss of water when cells are placed in a hypertonicsolution.c. has numerous functions that affect the shape and activities of thecell that produced it.d. contains the junctions that sometimes occur between cells.e. All of these are correct.
Describe the chemical composition of membranes. What are the two most critical functions of membranes? What contributes to membrane fluidity and rigidity? Explain Diffusion. What are the differences between Osmosis and Dialysis? Explain the differences between Iso, Hypo, and Hypertonic conditions. If the solutions is Hypertonic then the cell would be?
1) a) Draw arrows to indicate which direction Na+ vs K+ions will tend to move.(into vsout of the cell) b) What prevents these solutes from diffusing across the membrane at a significant rate? c)If the solutes were unable to move across the membrane, would the cell be considered hypertonic, hypotonic or isotonic? d) If the solutes were unable to move across the membrane, which way would water move?(inside the cell, outside the cell or no net movement) e) How did the cell establish the differential in the shown ion concentrations in the first place?