Cellular Physiology: Membrane Structure and Architecture Quiz
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Questions and Answers

What is the fundamental structural and functional unit of every living organism?

  • Cells (correct)
  • Tissues
  • Organs
  • Systems

Which cellular structure is enclosed by a double-membraned envelope with pores?

  • Nucleus (correct)
  • Centrioles
  • Plasma membrane
  • Golgi complex

What is the primary function of ribosomes in a cell?

  • Waste elimination
  • Protein synthesis (correct)
  • Storage of genetic information
  • Energy production

Which organelle is involved in the storage and transmission of genetic information in cells?

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

What is the average size range of a cell, typically observed under a microscope?

<p>$10$ to $20$ micrometers (A)</p> Signup and view all the answers

Which part of a cell is responsible for maintaining its shape and structural integrity?

<p>Centrioles (A)</p> Signup and view all the answers

What is the primary function of the plasma membrane?

<p>Regulating the entry of ions and nutrients (A)</p> Signup and view all the answers

How does the plasma membrane facilitate communication between the cell and its environment?

<p>Containing proteins that allow the cell to recognize molecules or changes in its environment (B)</p> Signup and view all the answers

Which component of the cell relies on membrane proteins to maintain the cell's shape?

<p>Cytoskeleton (D)</p> Signup and view all the answers

What is the chemical composition of membranes primarily made up of?

<p>Lipids and proteins with no carbohydrates (B)</p> Signup and view all the answers

Which factor does NOT influence the variation in membrane composition?

<p>Levels of carbohydrates in the diet (A)</p> Signup and view all the answers

What is the role of membrane proteins in establishing connections between cells?

<p>Creating specialized junctions between adjacent cells (D)</p> Signup and view all the answers

What type of lipids make up the cellular membranes according to the text?

<p>Sphingophospholipids (C)</p> Signup and view all the answers

How do the apolar chains of fatty acids in phospholipids orient within the membrane?

<p>Towards the center of the bilayer (B)</p> Signup and view all the answers

Where do the polar regions of phospholipids face within the membrane structure?

<p>Towards the surfaces of the membrane (B)</p> Signup and view all the answers

Which component of the cellular membrane has an apolar cyclic nucleus with a polar hydroxyl group?

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

What type of interactions do cholesterol's polar hydroxyl groups form within the membrane?

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

In a cellular membrane, what role does cholesterol play in relation to phospholipids?

<p>Increasing membrane fluidity (B)</p> Signup and view all the answers

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