Cellular Physiology: Ion Channels and Homeostasis
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Questions and Answers

What is the primary function of the plasma membrane?

  • To synthesize proteins
  • To establish a boundary and protect cellular contents (correct)
  • To store genetic information
  • To facilitate cell division

What is the main component of the plasma membrane?

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

What is the arrangement of phospholipids in the plasma membrane?

  • Hydrophilic parts face outwards, hydrophobic parts face inwards (correct)
  • Both hydrophilic and hydrophobic parts face outwards
  • Both hydrophilic and hydrophobic parts face inwards
  • Hydrophilic parts face inwards, hydrophobic parts face outwards

What is the function of structural proteins in the plasma membrane?

<p>To provide cell support and shape (A)</p> Signup and view all the answers

What is the term for the movement of ions, nutrients, and waste molecules through the plasma membrane?

<p>Selective permeability (B)</p> Signup and view all the answers

What is the fluid mosaic model?

<p>A dynamic structure of lipids and proteins (D)</p> Signup and view all the answers

What is the main function of channel proteins?

<p>To allow water, ions, and proteins to flow passively through the bilayer (A)</p> Signup and view all the answers

What is the role of glycoproteins in cell membranes?

<p>To help in cell-to-cell communications and adhesion (D)</p> Signup and view all the answers

What is the primary function of aquaporin proteins?

<p>To provide transmembrane pores for water transport (C)</p> Signup and view all the answers

What occurs when a cell is exposed to a hypertonic external solution?

<p>The cell will shrink due to osmotic water loss (B)</p> Signup and view all the answers

What is the term for the diffusion of water from a less concentrated to a more concentrated solution through a selectively permeable membrane?

<p>Osmosis (B)</p> Signup and view all the answers

In which regions are aquaporin proteins typically found?

<p>In regions where water transport is physiologically important (kidney, intestine) (A)</p> Signup and view all the answers

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