Cell Physiology: General Characteristics
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Questions and Answers

What is the function of the cell membrane?

  • To maintain the medium for the cell's survival (correct)
  • To respond to the entry of invaders into the body
  • To produce energy for the cell
  • To eliminate carbon dioxide and metabolic wastes

    • Which type of substance makes up approximately 40% of the composition of the cell membrane?

  • Proteins
  • Nucleic acids
  • Carbohydrates
  • Lipids (correct)

    • What is the significance of the 'fluid mosaic model' in the structure of the cell membrane?

  • It allows free exchange of substances between extracellular and intracellular fluids (correct)
  • It represents a rigid and static structure of the cell membrane
  • It prevents the entry of invaders into the body
  • It produces energy necessary for cell growth and repair

    • Which characteristic is specific to neurons regarding reproduction?

    <p>Does not reproduce</p> Signup and view all the answers

    What is the function of proteins in the cell membrane?

    <p>To allow free exchange of substances between ECF and ICF</p> Signup and view all the answers

    What is the role of carbohydrates in the cell membrane?

    <p>To regulate the entry of invaders into the body</p> Signup and view all the answers

    Which type of molecules form the major lipids in the lipid layer of the cell membrane?

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

    What is the function of cholesterol in the lipid layer of the cell membrane?

    <p>To maintain the structural integrity of the cell membrane</p> Signup and view all the answers

    What are the two categories of protein molecules present in the protein layers of the cell membrane?

    <p>Integral proteins and peripheral proteins</p> Signup and view all the answers

    Which type of proteins provide a route for the diffusion of water-soluble substances like glucose and electrolytes through the cell membrane?

    <p>Channel proteins</p> Signup and view all the answers

    What characterizes channel proteins in the cell membrane in terms of permeability?

    <p>They permit only one type of ion to pass through them</p> Signup and view all the answers

    What is the function of peripheral proteins in the cell membrane?

    <p>To facilitate cell signaling processes</p> Signup and view all the answers

    Which substance is responsible for maintaining the fluid nature of the lipid layer in the cell membrane?

    <p>'Tail' portion of phospholipids</p> Signup and view all the answers

    What is the outer part of a phospholipid molecule that faces the extracellular fluid?

    <p>'Head' portion</p> Signup and view all the answers

    What type of substances are allowed to pass through the semi-permeable lipid layer of the cell membrane?

    <p>Fat-soluble substances only</p> Signup and view all the answers

    What are the two categories into which protein molecules in the cell membrane are classified?

    <p>Integral proteins and glycoproteins</p> Signup and view all the answers

    The cell membrane separates the intracellular fluid (ICF) from the extracellular fluid (ECF).

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

    Neurons are capable of reproducing through division.

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

    The cell membrane is primarily composed of lipids.

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

    The 'fluid mosaic model' describes the structure of the cell membrane as a rigid and fixed layer.

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

    The cell membrane is impermeable to all substances.

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

    Cholesterol does not play a role in the lipid layer of the cell membrane.

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

    The lipid layer of the cell membrane is semi-permeable and allows water-soluble materials to pass through.

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

    The central layer of the cell membrane is formed by protein substances.

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

    The phospholipid molecules in the lipid layer have a hydrophilic head portion that faces the cytoplasm.

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

    Peripheral proteins are tightly bound with the cell membrane.

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

    Cholesterol in the cell membrane helps to maintain the fluid nature of the lipid layer.

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

    Integral proteins provide routes for diffusion of water-soluble substances like glucose and electrolytes through the cell membrane.

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

    Channel proteins in the cell membrane are not characterized by selective permeability.

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

    The protein layers of the cell membrane are situated on either side of the central lipid layer.

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

    The major lipids in the lipid layer of the cell membrane are phospholipids and glycolipids.

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

    The carbohydrate molecules in the cell membrane play a role in maintaining its structural integrity.

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

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