Comprehensive Notes on Organic and Inorganic Molecules, Proteins, and Nucleic Acids

Differences Between Inorganic and Organic Molecules

  • Definition of Inorganic Molecules
    • Molecules that are not based on carbon and hydrogen.
    • Examples:
    • Carbon dioxide
    • Oxygen
    • Water
    • Inorganic acids, bases, and salts
  • Definition of Organic Molecules
    • Molecules that are primarily based on carbon and hydrogen.
    • Examples:
    • Carbohydrates
    • Lipids
    • Proteins
    • Nucleic acids
    • ATP

Organic Molecules Details

  • Organic molecules typically contain carbon, hydrogen, and sometimes oxygen.
  • They are covalently bonded.
  • Key Organic Molecule Categories:
    • Carbohydrates:
    • Composition: Carbon (C), Hydrogen (H), Oxygen (O)
    • Ratio: 1:2:1 (C:H:O)
      • Example: If there are 4 Hydrogens, there would be 2 Carbons.
    • Types of Carbohydrates:
    • Monosaccharides (simple sugars):
      • Examples: Glucose, Fructose, Galactose
    • Disaccharides:
      • Condensed from two simple sugars through dehydration synthesis.
      • Examples: Sucrose, Maltose, Lactose
    • Polysaccharides:
      • Multiple monosaccharides connected via dehydration synthesis.
      • Examples: Glycogen, Starch, Cellulose
      • Note: Humans cannot digest cellulose.

Hydrolysis and Dehydration Synthesis

  • Hydrolysis:
    • Involves adding water to break down larger molecules.
    • Example: Glucose + Fructose → Sucrose (via dehydration synthesis)
  • Dehydration Synthesis:
    • Involves removing water to create larger molecules.

Lipids and Fats

  • Composition of Lipids:
    • Made primarily of Carbon (C) and Hydrogen (H) in a 1:2 ratio.
  • Examples:
    • Fatty acids, Triglycerides, Phospholipids, Steroids, Prostaglandins
  • Triglycerides Explained:
    • Composed of three fatty acid tails attached to a glycerol molecule (backbone).
    • Functions: Insulation, energy storage, and protection.
  • Saturated vs Unsaturated Fats:
    • Saturated: No double bonds, straight structure (solid at room temperature, e.g., butter).
    • Unsaturated: At least one double bond, bent structure (liquid at room temperature, e.g., oils).

Phospholipids and Cell Membranes

  • Key Component of Cell Membrane:
    • Forms a lipid bilayer with hydrophilic (water-loving) heads and hydrophobic (water-fearing) tails.
  • Important Definition:
    • Hydrophilic: Water-attracting
    • Hydrophobic: Water-repelling

Steroids and Prostaglandins

  • Types of Steroids:
    • Hormones (e.g., estrogen, testosterone) and cholesterol.
  • Function of Prostaglandins:
    • Mediates inflammation and vasodilation during injury.
    • Works locally as a signaling molecule to amplify effects of injury responses.

Proteins

  • Most abundant macromolecules composed of Carbon (C), Hydrogen (H), Oxygen (O), and Nitrogen (N).
  • Basic Building Blocks: Amino acids (20 types, with 9 being essential).
  • Role of R Group: Determines characteristics of amino acids, affecting polarity and functionality.

Protein Structure and Functions

  • Structure Types:
    • Primary: Sequence of amino acids
    • Secondary: Alpha-helix or beta-pleated sheet formation
    • Tertiary: 3D folding due to all interactions including h-bonds, ionic bonds, etc.
    • Quaternary: Multiple polypeptides combining
  • Denaturation:
    • Loss of protein structure due to environmental factors (temperature, pH).

Enzyme Functionality

  • Enzymes are catalysts specific to one reaction.
  • Active Sites: Bind substrates, forming enzyme-substrate complexes.
  • Product formation from substrates results in enzyme returning to its original state, facilitating further reactions.

Nucleic Acids

  • Types:
    • DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)
  • Functions: Store/process genetic information and direct protein synthesis.
  • Nucleotide Structure:
    • Composed of a nitrogenous base, sugar, and phosphate group.
    • Base Pairing Rules:
    • DNA: A-T, C-G
    • RNA: A-U, C-G

ATP (Adenosine Triphosphate)

  • ATP is the energy currency of the cell.
  • Reaction for ATP Formation:
    • ADP+phosphate+energy<br/>ightarrowATPADP + phosphate + energy <br /> ightarrow ATP
    • Key in metabolic reactions (catabolic and anabolic).
  • Metabolic Role of ATP: Provides energy for physiological functions.

Study Strategies and Review Tips

  • Importance of repetition in learning complex materials.
  • Utilizing various resources (videos, Quizlets, practice problems) to reinforce understanding.
  • Stay consistent with study habits to improve retention and overall performance in the course.