In-Depth Notes on Functional Groups and Carbohydrates

Nonpolar Molecules and Water Interaction

  • Nonpolar (NP) molecules do not interact with water due to the lack of hydrogen bonding (H-bonding).
  • While H-bonds are characteristic of water, they can occur with other molecules outside of water.

Functional Groups

  • Amides (Polar)

    • Structure: CO-NH-H
    • Characteristics: Contains nitrogen and oxygen, which can participate in H-bonding.

  • Carboxylic Acids (Polar)

    • Structure: COOH or COO-
    • Characteristics: Can donate protons (H+) and participate in H-bonding.

  • Amines (Polar)

    • Structure: NH2 or NH3+
    • Characteristics: Basic functional group capable of accepting protons (H+).

  • Alcohols/Hydroxyls (Polar)

    • Structure: OH
    • Characteristics: Contains hydroxyl groups that can form H-bonds with water, enhancing solubility.

  • Methyl (Non-Polar)

    • Structure: CH3
    • Characteristics: Nonpolar due to lack of functional groups capable of H-bonding.

  • Phosphate (Polar)

    • Structure: O-POOH-OH
    • Characteristics: Involved in energy transfer and can participate in biological processes.

Protonation and Deprotonation

  • Deprotonated: Loss of an extra H+ ion. Examples:

    • NH2
    • COO-

  • Protonated: Gain of an extra H+ ion. Examples:

    • NH3+
    • COOH

Biomolecules and Macromolecules

  • Fundamental building blocks of all cells consist of various functional groups often appearing in repeating patterns.
  • Biomolecules include proteins, nucleic acids, carbohydrates, and lipids.

Chemical Reactions in Biomolecules

  • Condensation Reaction:

    • A chemical process where two molecules bond with the loss of water.

  • Hydrolysis Reaction:

    • A reaction where bonds are broken by the addition of water.

Carbohydrates

  • Essential macromolecules for nutrition; they include many sugars and exoskeleton materials in insects.

  • Composed mainly of hydroxyl groups with a general formula of (CH₂O)ₙ.

  • Monosaccharides:

    • Basic units of sugar containing varying numbers of carbon atoms.

  • Polysaccharides:

    • Formed from multiple monosaccharide units through condensation reactions.

  • Starch: A common form of carbohydrate, serving as an energy reserve in plants.