BMS 1021 Biochemistry and Cell Biology Notes

Introduction

  • Interactive session led by Jerome and Mike covering biochemistry and cell biology - BMS 1021.
  • Focus on assessment preparation through multiple-choice questions (MCQs) and long-form answers.

Biochemistry Concepts

Macromolecules Overview
  • Key macromolecules:
    • Carbohydrates
    • Lipids
    • Proteins
    • Nucleic acids (DNA & RNA)
  • Importance of understanding category structures and their functions in cells.
Properties of Water
  • Water as a dipole with slightly positive hydrogen atoms and a slightly negative oxygen atom.
  • Unique properties include:
    • Hydrophilic interactions: Water molecules orient towards charged objects (e.g., electrostatically charged balloon).
    • Hydrogen bonding: Water molecules can bond due to their polar nature, vital for properties like ice formation.

Cell Biology Concepts

Differences Between Eukaryotic and Prokaryotic Cells
  • Focus on the endomembrane system unique to eukaryotic cells.
  • Process of gene transcription and translation:
    1. Nucleus: DNA transcription to mRNA.
    2. Ribosomes: Sites of protein translation (both in cytosol and on rough ER).
    3. Endoplasmic Reticulum (ER):
    • Rough ER: Studded with ribosomes, synthesizes proteins for secretion or membrane incorporation.
    • Smooth ER: Synthesizes lipids and detoxifies.
Protein Destination and Functionality
  • Fate of synthesized proteins:
    • Proteins synthesized in rough ER may be modified and sent to the Golgi apparatus for further processing before reaching their final locations (plasma membrane, lysosomes, or secreted outside the cell).
  • Mechanisms for protein localization:
    • Signal sequences on mRNA direct proteins to specific locations.
Protein Structure Levels
  • Primary structure: Sequence of amino acids.
  • Secondary structure: Local spatial arrangement (e.g., alpha-helices and beta-sheets).
  • Tertiary structure: 3D folding of a polypeptide due to interactions between R groups.
  • Quaternary structure: Assembly of multiple polypeptides.

Study Techniques

Use of Diagrams and Visual Aids
  • Draw diagrams (like Venn diagrams) to visualize relationships between biological structures (e.g., prokaryotic vs. eukaryotic cells).
  • Understand how different parts of the cell function together, especially in the context of gene expression and protein synthesis.
Importance of GFP (Green Fluorescent Protein)
  • Use of GFP to track protein locations in cells:
    • Fusion of GFP with target proteins allows visualization of their distribution via fluorescence microscopy.
  • GFP helps determine the cellular pathways and localization of proteins within the cell.

Conclusion

  • The lecture emphasized understanding the structure-function relationship of biological molecules.
  • Importance of protein trafficking in cells for proper function was a central theme.
  • Encouragement for students to actively engage and ask questions for deeper understanding.