Membrane Structure and Function Quiz
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Questions and Answers

What is the process of passive transport of molecules or ions across a cell membrane via specific transmembrane proteins?

  • Facilitated diffusion (correct)
  • Active transport
  • Osmosis
  • Channel protein transport

    • What is the tendency for molecules to spread out evenly into the available space called?

  • Diffusion (correct)
  • Osmosis
  • Active transport
  • Facilitated diffusion

    • What is the ability of a solution to cause a cell to gain or lose water called?

  • Osmosis
  • Active transport
  • Tonicity (correct)
  • Facilitated diffusion

    • What is the control of water balance called?

    <p>Osmoregulation</p> Signup and view all the answers

    What is the movement of bio-chemicals from areas of high concentration to areas of low concentration without the requirement of energy called?

    <p>Passive transport</p> Signup and view all the answers

    What is the movement of bio-chemicals from areas of low concentration to areas of high concentration and therefore requires energy called?

    <p>Active transport</p> Signup and view all the answers

    What is the difference in concentration of a substance from one area to another called?

    <p>Concentration gradient</p> Signup and view all the answers

    What is the diffusion of water across a selectively permeable membrane called?

    <p>Osmosis</p> Signup and view all the answers

    What is the process of passive transport of molecules or ions across a cell membrane via specific transmembrane proteins called?

    <p>Facilitated diffusion</p> Signup and view all the answers

    What is the ability of a solution to cause a cell to gain or lose water called?

    <p>Tonicity</p> Signup and view all the answers

    What is the control of water balance called?

    <p>Osmoregulation</p> Signup and view all the answers

    What is the movement of bio-chemicals from areas of high concentration to areas of low concentration without the requirement of energy called?

    <p>Passive transport</p> Signup and view all the answers

    What is the plasma membrane boundary that separates the living cell from its surroundings called?

    <p>Cell membrane</p> Signup and view all the answers

    What does the fluid mosaic model state about the membrane structure?

    <p>A membrane is a fluid structure with a mosaic of various macromolecules embedded in it</p> Signup and view all the answers

    Who proposed that the membrane is a mosaic of proteins dispersed within the bilayer?

    <p>J. Singer and G. Nicolson</p> Signup and view all the answers

    What is the boundary that separates the living cell from its surroundings called?

    <p>Plasma membrane</p> Signup and view all the answers

    What is the structure of the plasma membrane according to the fluid mosaic model?

    <p>A fluid structure with a mosaic of various macromolecules embedded in it</p> Signup and view all the answers

    Who proposed the fluid mosaic model of the membrane structure?

    <p>J. Singer and G. Nicolson</p> Signup and view all the answers

    What is the selective permeability of the plasma membrane responsible for?

    <p>Allowing some substances to cross it more easily than others</p> Signup and view all the answers

    What is the structure of the plasma membrane according to the fluid mosaic model?

    <p>A fluid structure with a mosaic of various macromolecules embedded in it</p> Signup and view all the answers

    What do phospholipids in the plasma membrane contain?

    <p>Hydrophobic and hydrophilic regions</p> Signup and view all the answers

    What did J. Singer and G. Nicolson propose about the membrane structure in 1972?

    <p>The membrane is a mosaic of proteins dispersed within the bilayer</p> Signup and view all the answers

    What is the boundary that separates the living cell from its surroundings called?

    <p>Plasma membrane</p> Signup and view all the answers

    What is the selective permeability of the plasma membrane responsible for?

    <p>Allowing some substances to cross it more easily than others</p> Signup and view all the answers

    Phospholipids contain both hydrophobic and hydrophilic regions.

    <p>True</p> Signup and view all the answers

    The plasma membrane is a rigid structure with no fluidity.

    <p>False</p> Signup and view all the answers

    The fluid mosaic model proposes that the plasma membrane is a fluid structure with a mosaic of various macromolecules embedded in it.

    <p>True</p> Signup and view all the answers

    The plasma membrane is a single layer of phospholipids.

    <p>False</p> Signup and view all the answers

    J. Singer and G. Nicolson proposed that the membrane is a mosaic of proteins dispersed within the bilayer, with only the hydrophobic regions exposed to water.

    <p>False</p> Signup and view all the answers

    The selective permeability of the plasma membrane allows all substances to cross it equally.

    <p>False</p> Signup and view all the answers

    The plasma membrane exhibits selective permeability, allowing some substances to cross it more easily than others.

    <p>True</p> Signup and view all the answers

    The fluid mosaic model states that a membrane is a rigid structure with no movement.

    <p>False</p> Signup and view all the answers

    The plasma membrane consists of a single layer of proteins.

    <p>False</p> Signup and view all the answers

    The fluid mosaic model of the membrane structure was proposed in 1972.

    <p>True</p> Signup and view all the answers

    The plasma membrane has two layers (a bilayer) of phospholipids.

    <p>True</p> Signup and view all the answers

    The plasma membrane is the boundary that separates the dead cell from its surroundings.

    <p>False</p> Signup and view all the answers

    Passive transport requires energy to move bio-chemicals from areas of high concentration to areas of low concentration.

    <p>False</p> Signup and view all the answers

    Facilitated diffusion is an example of active transport.

    <p>False</p> Signup and view all the answers

    Osmosis is the movement of water across a selectively permeable membrane.

    <p>True</p> Signup and view all the answers

    Tonicity refers to the ability of a solution to cause a cell to gain or lose water.

    <p>True</p> Signup and view all the answers

    Cell walls help maintain water balance in plant cells.

    <p>True</p> Signup and view all the answers

    Active transport requires energy to move bio-chemicals from areas of low concentration to areas of high concentration.

    <p>True</p> Signup and view all the answers

    Channel proteins can transport molecules against their concentration gradient.

    <p>False</p> Signup and view all the answers

    Carrier proteins can transport molecules against their concentration gradient.

    <p>True</p> Signup and view all the answers

    Channel proteins transport both water-soluble and insoluble molecules.

    <p>True</p> Signup and view all the answers

    Carrier proteins mediate only passive transport.

    <p>False</p> Signup and view all the answers

    Passive transport is the movement of bio-chemicals from areas of low concentration to areas of high concentration.

    <p>False</p> Signup and view all the answers

    Active transport can transport glucose, sodium, and potassium ions.

    <p>True</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Plasma membrane = Boundary that separates the living cell from its surroundings Selective permeability = Exhibits selective permeability, allowing some substances to cross it more easily than others Fluid mosaic model = States that a membrane is a fluid structure with a mosaic of various macromolecules embedded in it Phospholipids = Contains hydrophobic and hydrophilic regions</p> Signup and view all the answers

    Match the following scientists with their proposal about membrane structure:

    <p>J. Singer and G. Nicolson = Proposed that the membrane is a mosaic of proteins dispersed within the bilayer, with only the hydrophilic regions exposed to water Chris Romero and Erin Barley = Updated the fluid mosaic model of the membrane structure Neil Campbell and Jane Reece = Authored the PowerPoint® Lecture Presentations for Biology Eighth Edition Joan Sharp = Contributed to the updated fluid mosaic model of the membrane structure</p> Signup and view all the answers

    Match the following actions with their descriptions:

    <p>Diffusion = Movement of bio-chemicals from areas of high concentration to areas of low concentration without the requirement of energy Osmosis = Diffusion of water across a selectively permeable membrane Active transport = Requires energy to move bio-chemicals from areas of low concentration to areas of high concentration Passive transport = Process of transport of molecules or ions across a cell membrane via specific transmembrane proteins</p> Signup and view all the answers

    Match the following functions of membrane proteins with their descriptions:

    <p>Transport = Movement of substances across the membrane Enzymatic activity = Catalysis of specific reactions at the membrane Signal transduction = Transmission of molecular signals from the exterior to the interior of the cell Cell-cell recognition = Identification of other cells for interaction or signaling</p> Signup and view all the answers

    Match the following terms related to water balance with their definitions:

    <p>Osmosis = Diffusion of water across a selectively permeable membrane Tonicity = Ability of a solution to cause a cell to gain or lose water Osmoregulation = Control of water balance in varying environments Plasmolysis = Shrinking of the cytoplasm due to water loss in a hypertonic environment</p> Signup and view all the answers

    Match the following types of solutions with their effects on cells:

    <p>Isotonic solution = No net movement of water into or out of the cell Hypertonic solution = Cell loses water and shrinks Hypotonic solution = Cell gains water and swells Turgid cell = Firm cell due to uptake of water in a hypotonic environment</p> Signup and view all the answers

    Match the following terms related to transport proteins with their characteristics:

    <p>Facilitated diffusion = Passive transport of molecules or ions via specific transmembrane proteins Active transport = Movement of bio-chemicals from areas of low concentration to high concentration requiring energy Channel proteins = Transport molecules from areas of high concentration to low concentration through a water-filled channel Carrier proteins = Transport molecules against their concentration gradient and mediate both active and passive transport</p> Signup and view all the answers

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