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Quiz 3

Vui Fui Vun 25 questions

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Questions in this quiz (25)

  1. 1Many physiological conditions are related to particular proteins in cell membranes. The number of insulin receptors in membranes is related to the amount of insulin present around those cells. If the presence of increased insulin results in a decrease in receptors and a decrease in insulin results in an increase in insulin receptors, this would be an example of
    1. Aa metabolic pathway.
    2. Bnegative or regulatory feedback.
    3. Cpassive transport.
    4. Dcompetitive inhibition.
  2. 2The fluid mosaic model describes the plasma membrane as consisting of
    1. Aa phospholipid bilayer with embedded carbohydrates.
    2. Btwo layers of phospholipids with cholesterol sandwiched between them.
    3. Ccarbohydrates and phospholipids that can drift in the membrane.
    4. Ddiverse proteins embedded in a phospholipid bilayer.
  3. 3Membrane phospholipids
    1. Ahave hydrophobic heads that face the center of the membrane and are shielded from water.
    2. Bhave hydrophilic tails that face outward and are exposed to water.
    3. Care able to drift about in the plasma membrane.
    4. Dremain fluid because they are tightly packed against one another.
  4. 4The cholesterol associated with animal cell membranes
    1. Ais attached to membrane proteins and extends into the watery environment surrounding the cell.
    2. Bhelps to keep phospholipids from being too close to one another.
    3. Cis an abnormality resulting from a diet high in cholesterol.
    4. Dhelps solidify the membranes when the room temperature is below freezing.
  5. 5Most of the functions of a cell membrane, including transport and enzymatic function, are performed by
    1. Aglycolipids.
    2. Bproteins.
    3. Cphospholipids.
    4. Dcholesterol.
  6. 6Which of the following statements regarding membrane protein function is false?
    1. AMembrane proteins serve as enzymes.
    2. BMembrane proteins act as receptors to molecules like hormones.
    3. CMembrane proteins form junctions between cells.
    4. DMembrane proteins transfer genetic information to the cytoplasm.
  7. 7Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell occurs when
    1. Aa signaling molecule binds to a protein that extends to the outside of the cell.
    2. Ba protein receptor on the interior of the membrane become bounds by a signaling molecule.
    3. Cthe extracellular matrix is moved to the inside of the cell.
    4. Dglycoproteins are recognized by other cells.
  8. 8Small, nonpolar, hydrophobic molecules such as fatty acids
    1. Aeasily pass through a membrane's lipid bilayer.
    2. Bvery slowly diffuse through a membrane's lipid bilayer.
    3. Crequire transport proteins to pass through a membrane's lipid bilayer.
    4. Dare actively transported across cell membranes.
  9. 9Which of the following substances would have the most trouble crossing a biological membrane by diffusing through the lipid bilayer?
    1. AO2
    2. BCO2
    3. CNa+
    4. Da small, nonpolar molecule such as butane (C4H10)
  10. 10Which of the following statements regarding diffusion is false?
    1. ADiffusion is a result of the thermal energy of atoms and molecules.
    2. BDiffusion requires no input of energy into the system.
    3. CDiffusion occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated.
    4. DDiffusion occurs even after equilibrium is reached and no net change is apparent.

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Description
Biology Quiz on Quiz 3, created by Vui Fui Vun on 22/04/2022.
Language
English
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