Biology Membranes and Lipids

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Questions and Answers

What molecules are the constituents of biological membranes?

  • Carbohydrates, nucleic acids, and amino acids
  • Lipids, amino acids, and proteins
  • Lipids, proteins, and carbohydrates (correct)
  • Proteins, nucleic acids, and lipids

Why do lipids establish the physical integrity of the membrane?

  • To create a barrier for hydrophobic materials (correct)
  • To allow rapid passage of hydrophilic materials
  • To enhance the movement of carbohydrates within the membrane
  • To prevent the movement of proteins within the membrane

What model describes the general design of biological membranes?

  • Dynamic mesh model
  • Rigid barrier model
  • Solid crystal model
  • Fluid mosaic model (correct)

Which part of a phospholipid interacts with the aqueous environment?

<p>Charged, hydrophilic heads (C)</p> Signup and view all the answers

What is a characteristic of some membranes with regard to protein content?

<p>Some membranes have more protein than lipids (B)</p> Signup and view all the answers

Which molecule forms the hydrophobic core of the membrane?

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

What is the thickness of a biological membrane, as mentioned in the text?

<p>0.008 μm (B)</p> Signup and view all the answers

In a biological membrane, what makes for a less dense and more fluid packing of the fatty acids in the lipid bilayer?

<p>Unsaturated fatty acids with 'kinks' (D)</p> Signup and view all the answers

Which component is important for membrane integrity and modulates membrane fluidity according to the text?

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

What effect does having shorter-chain fatty acids, unsaturated fatty acids, or less cholesterol have on membrane fluidity?

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

Why is spontaneous phospholipid flip-flop from one half of the bilayer to the other rare?

<p>Due to the movement of the polar part through the hydrophobic interior (D)</p> Signup and view all the answers

How does temperature affect membrane fluidity?

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

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