Biology 101 Study Notes

Introduction

  • Course Title: Biology 101

  • Class: 2-1 (Week 2, Class 1)

  • Instructor: [Name not provided in transcript]

  • Image Reference: David Goodsell, "The Machinery of Life"

  • Today’s Equipment: No clickers used today, but students should have them ready for Thursday.

  • Materials: Handouts available from TA or at the front of the classroom.

Class Outline

  1. Housekeeping Notes

  2. Completion of Two-Stage Review, Preview, and Challenge

  3. Introduction to the Cell

  4. Inventive Activities

Course Setup

  • Thank You Note: Appreciation expressed for completing the welcome survey and pre-class assignments (quiz and feedback/journal).

  • TA Involvement: TAs will read course journals and provide feedback.

  • Lab Timing: No lab preparation this week; labs commence next week.

  • Canvas Notifications: Students are advised to turn ON notifications for Canvas announcements.

Class Locations

  • Lecture Room: D100

  • Lab and Tutorial Rooms:

    • Lab: 2-hour section in room B8206

    • Tutorial: 1-hour section in a different room

SC101 Drop-In Hours

  • Best Times for Help: Dedicated student help hours incorporate lab hours. TAs available during labs for support.

    • Monday 9:30, 10:30, 11:30, 12:00 (Drop-in Help)

    • Tuesday 12:30, 1:30 (Drop-in Help)

    • Wednesday 9:30, 10:30, 11:30 (Lab)

    • Thursday 12:30, 1:30 (Lab)

    • Friday 9:30, 10:30, 11:30 (Lab)

Course Structure Overview

  • Units of Study:

    • Unit 1: Cells & Molecules

    • Unit 2: Animal Physiology

    • Unit 3: Plant Physiology

Learning Objectives for the Day: Cells and Macromolecules

  • Understanding and Relating Structure to Function:

    • At molecular, cellular, and physiological levels.

  • Identifying Macromolecule Structures:

    • Describing structures of four macromolecules and major cellular components.

  • Biological Levels of Organization:

    • Understanding relationships between molecules, organelles, cells, and larger organizational levels.

Worksheet Practice - Learning Objectives

Question 1: Names & Functions of Cell Components

Cell Components Listed:

  1. Nucleus

    • Function: Stores genetic information (DNA).

  2. Nucleolus

    • Function: Transcribes rRNA for ribosome production.

  3. Endoplasmic Reticulum (ER)

    • Function: Synthesizes proteins and lipids; transports proteins.

  4. Golgi Apparatus

    • Function: Modifies, sorts, and packages proteins and lipids for transport.

  5. Ribosome

    • Function: Site of protein synthesis.

  6. Mitochondria

    • Function: Powerhouse of the cell; ATP production.

  7. Cell Membrane

    • Function: Protects the cell; selective barrier.

  8. Cytoskeleton

    • Function: Maintains cell shape and facilitates movement.

  9. Lysosome

    • Function: Digests macromolecules, old cell parts, and microorganisms.

  10. Peroxisome

    • Function: Breaks down fatty acids and detoxifies harmful substances.

Question 2: Macromolecules Making Up Cell Structures

  • Biological Macromolecules:

    1. Proteins (polypeptides)

    2. Nucleic acids

    3. Carbohydrates

    4. Lipids (e.g., phospholipids)

Connections with Cell Structures

  • Macromolecules synthesized and assembled into functional structures:

    • Macromolecular Synthesis Examples: Transcription and translation that lead to enzyme complexes, DNA double helices, and lipid bilayers.

    • Further Focus: Unit 1 will cover each macromolecule and one function for each.

Clicker Setup Instructions

  • App: Ignore attendance percentage, often inaccurate.

  • Physical Remote:

    • Set clicker frequency once by:

      • Holding power button for 2-3 seconds until blue flash.

      • Pressing C, then B (setting frequency to CB).

    • Voting Indicator: Green light confirms votes.

The Four Biological Macromolecules

  1. Proteins (polypeptides)

  2. Nucleic Acids

  3. Carbohydrates

  4. Lipids (e.g., phospholipids)

  • Phospholipid Structure:

    • Composition: Hydrophilic head (phosphate group) and hydrophobic tails (fatty acid chains).

    • Phospholipids arranged to form a bilayer:

    • Properties: Nonpolar interior and polar exterior.

Transport Across Membranes

Learning Objectives: Lipids and Membranes

  • Phospholipid Structure & Properties: Understand how these relate to biological functions.

  • Transport Mechanisms: Differentiate between methods of transport across membranes.

    • Semi-permeability: Some molecules (e.g., H₂O, Na⁺, CO₂) can require transport proteins to cross the membrane.

Types of Transport

1. Passive Transport

  • Transport down concentration gradient (high to low) without energy input.

    • Types:

    • Simple diffusion

    • Facilitated diffusion (using transport proteins or channels).

    • Osmosis: Special case of diffusion involving water.

2. Active Transport

  • Transport against concentration gradient (low to high) requiring energy input (via ATP).

  • Transport proteins can either act as channels or carriers, changing shape during the transport process.

Concentration Gradient Definition

  • Definition: A difference in concentration on either side of a membrane.

  • Movement:

    • High to Low: Moving "along","with" or "down" the gradient.

    • Low to High: Moving "against" or "up" the gradient.

Conclusion

  • Reference Image: Membrane Transport Explanation (Not provided in transcript)

Additional Functions of Membranes

  • Beyond transport, membranes have diverse roles contributed by various proteins, carbohydrates, and lipids that serve different functions in the cell.

Next Steps in Course

  • Anticipated topics and more details will be covered in future lectures, focusing on the complexity and functionality of cellular structures and processes.