Biology Chapter: Macromolecules and Organic Chemistry

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Questions and Answers

Which of the following macromolecules are often referred to as sugars? (Select all that apply)

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

What common macromolecule is Omega-3 Fatty Acid classified as?

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

Organic molecules are typically identified by the presence of _____ bonds.

Carbon-Hydrogen

DNA includes 3 nucleic acid subgroups referred to as nucleotides.

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

In addition to ionic bonds and covalent bonds, polar molecules can also form a third type of bond called hydrogen bonds.

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

For the most part, Lipids are polar.

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

Which of the following describes H2O, NaCl, CO2, and HCl?

<p>They are all inorganic molecules (D)</p> Signup and view all the answers

Besides DNA, another nucleic acid is ____.

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

The four common macromolecules used by all living organisms are lipids, proteins, carbohydrates, and fats.

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

The carbohydrate monosaccharide subunit most commonly used for energy is ____.

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

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Study Notes

Macromolecules

  • Carbohydrates are often referred to as sugars and serve as a primary source of energy.
  • Omega-3 Fatty Acid is classified as a lipid, a type of macromolecule important for cell membranes and energy storage.

Organic Molecules

  • Organic molecules are primarily identified by the presence of carbon-hydrogen bonds, a key feature distinguishing them from inorganic molecules.

Nucleic Acids

  • DNA does not include three subgroups of nucleic acids; it is made of four types of nucleotides (adenine, thymine, cytosine, guanine).
  • RNA is a significant nucleic acid in addition to DNA, playing a crucial role in protein synthesis.

Bonds

  • Polar molecules can form hydrogen bonds, in addition to ionic and covalent bonds, contributing to various biological processes.
  • Lipids, typically non-polar, do not usually have polar properties, resulting in their ability to form cellular membranes.

Inorganic vs. Organic Molecules

  • H2O, NaCl, CO2, and HCl are all classified as inorganic molecules, lacking carbon-hydrogen bonds.
  • Common macromolecules used by living organisms include lipids, proteins, carbohydrates, and nucleic acids, not fats.

Energy Sources

  • Glucose is the most commonly used carbohydrate monosaccharide for energy in living organisms.

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