Lipids: Structure and Function

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Questions and Answers

What is the main function of lipids in living organisms?

  • Serving as long-term energy storage
  • Acting as a boundary for cells (correct)
  • Forming hormones like testosterone and estrogen
  • Providing insulation to the body

Which type of fatty acids is solid at room temperature?

  • Unsaturated fatty acids
  • Saturated fatty acids (correct)
  • Monounsaturated fatty acids
  • Trans fatty acids

What is the main constituent of a lipid polymer called a triglyceride?

  • Fatty acids (correct)
  • Steroids
  • Phospholipids
  • Cholesterol

Which of the following is an example of a lipid?

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

What type of bonds do unsaturated fatty acids have between carbon atoms?

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

What is the primary element in lipids?

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

Which macromolecules form the basis of lipids?

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

What type of bonds do saturated fatty acids have between carbon atoms?

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

Which of the following is NOT a type of lipid?

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

What is the main function of triglycerides in living organisms?

<p>Long-term energy storage (D)</p> Signup and view all the answers

Which of the following is a saturated triglyceride?

<p>Contains only saturated fatty acids (D)</p> Signup and view all the answers

What types of macromolecules make up cell membranes in living organisms?

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

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Study Notes

  • Lipids are essential components of every cell membrane in living organisms.
  • They are part of the phospholipid membrane that acts as a boundary for cells.
  • Lipids include not only fats but also oils, waxes, and steroids.
  • Steroids such as cholesterol and hormones like testosterone and estrogen are lipids.
  • Lipids are large organic macromolecules made up of carbon, hydrogen, and oxygen.
  • Monomers called fatty acids form lipids through chemical bonds.
  • Saturated fatty acids have single bonds between carbon atoms, making them solid at room temperature.
  • Unsaturated fatty acids have double bonds between carbon atoms, making them liquid at room temperature.
  • A lipid polymer called a triglyceride forms when three fatty acids bond to a glycerol molecule.
  • Saturated triglycerides contain only saturated fatty acids, while unsaturated triglycerides have unsaturated fatty acids.
  • Lipids play various roles in living organisms, including cell membranes, long-term energy storage, insulation, and hormone formation.

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