General Biology 1 - Module 1: Cells
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Questions and Answers

What is the Cell Theory?

  • A fundamental concept in biology describing the properties of cells. (correct)
  • A theory that explains the origin of life.
  • A theory that states all cells come from non-living sources.
  • A theory that describes the process of cell division.
  • Which are the three main principles of the Cell Theory?

  • All living organisms are composed of cells. Cells are the basic units of life
  • The cell is the smallest unit of life and is the basic structural and functional unit of living organisms
  • All cells arise from pre-existing cells
  • All of the above (correct)
  • Who first observed and named "cells" in cork tissue?

    Robert Hooke

    Who observed living cells, including bacteria, using a simple microscope?

    <p>Anton van Leeuwenhoek</p> Signup and view all the answers

    Who proposed that plants and animals are made of cells?

    <p>Matthias Schleiden and Theodor Schwann</p> Signup and view all the answers

    Who stated that all cells come from pre-existing cells?

    <p>Rudolf Virchow</p> Signup and view all the answers

    What is the function of the plasma membrane?

    <p>Controls the movement of substances in and out of the cell</p> Signup and view all the answers

    What is the function of the cytoplasm?

    <p>Jelly-like substance that fills the cell and contains organelles</p> Signup and view all the answers

    What is the function of the nucleus?

    <p>Stores genetic material (DNA) and regulates cellular activities like growth, metabolism, and reproduction.</p> Signup and view all the answers

    What are the functions of Mitochondria?

    <p>Powerhouse of the cell; site of ATP (energy) production.</p> Signup and view all the answers

    What are the functions of Endoplasmic Reticulum (ER)?

    <p>Rough ER: Studded with ribosomes; synthesizes proteins. Smooth ER: Synthesizes lipids and detoxifies substances.</p> Signup and view all the answers

    What is the function of the Golgi Apparatus?

    <p>Modifies, packages, and transports proteins and lipids.</p> Signup and view all the answers

    What is the function of lysosomes?

    <p>Contain enzymes for digestion and waste removal.</p> Signup and view all the answers

    What is the function of chloroplasts? (in plant cells)

    <p>Site of photosynthesis.</p> Signup and view all the answers

    What is the function of vacuoles?

    <p>Store water, nutrients, and waste (large in plants).</p> Signup and view all the answers

    What is the function of the cytoskeleton?

    <p>Provides structure and facilitates movement.</p> Signup and view all the answers

    What is a prokaryotic cell?

    <p>A prokaryotic cell is a simple, unicellular organism that lacks a true nucleus and membrane-bound organelles. The genetic material is present in a region called the nucleoid. Examples include bacteria and archaea.</p> Signup and view all the answers

    Prokaryotic cells are larger in size than eukaryotic cells.

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

    Prokaryotic cells have a true nucleus

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

    Prokaryotic cells have membrane-bound organelles.

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

    Eukaryotic cells reproduce through binary fission.

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

    What are some examples of prokaryotic cells?

    <p>Bacteria, Archaea</p> Signup and view all the answers

    What are somatic cells?

    <p>Make up the body (e.g., skin cells, muscle cells).</p> Signup and view all the answers

    What are germ cells?

    <p>Reproductive cells (e.g., sperm and egg cells).</p> Signup and view all the answers

    What is the function of red blood cells (RBCs)?

    <p>Transport oxygen.</p> Signup and view all the answers

    What is the function of neurons?

    <p>Transmit signals in the nervous system.</p> Signup and view all the answers

    What is the function of muscle cells?

    <p>Responsible for movement.</p> Signup and view all the answers

    What is the function of plant cells (e.g., guard cells)?

    <p>Regulate gas exchange.</p> Signup and view all the answers

    What is the function of microvilli?

    <p>Increase surface area for absorption (e.g., in intestinal cells).</p> Signup and view all the answers

    What is the function of cilia and flagella?

    <p>Aid in movement and locomotion (e.g., in sperm or respiratory tract).</p> Signup and view all the answers

    What is the function of pseudopodia?

    <p>Extensions of the cytoplasm for movement or engulfing food (e.g., amoeba).</p> Signup and view all the answers

    What is the function of cell wall thickening in plants?

    <p>Provides strength and protection (e.g., in xylem cells).</p> Signup and view all the answers

    What is the function of plasmodesmata?

    <p>Channels between plant cells for transport and communication.</p> Signup and view all the answers

    What is the function of storage vacuoles in plants?

    <p>Adapted to store nutrients, waste, or water.</p> Signup and view all the answers

    What is keratinization?

    <p>Formation of a protective layer in skin cells.</p> Signup and view all the answers

    Flashcards

    Cell Theory

    The fundamental concept that states all living organisms are composed of cells, cells are the smallest unit of life, and all cells arise from pre-existing cells.

    Robert Hooke

    The scientist who first observed and named 'cells' in cork tissue in 1665.

    Anton van Leeuwenhoek

    The scientist who observed living cells, including bacteria, using a simple microscope.

    Matthias Schleiden

    Proposed that all plants are made of cells.

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    Theodor Schwann

    Co-proposed that all animals are made of cells.

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    Rudolf Virchow

    Stated that all cells arise from pre-existing cells (Omnis cellula e cellula).

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    Plasma Membrane

    A semi-permeable membrane made of a lipid bilayer controlling movement of substances in and out of the cell.

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    Cytoplasm

    Jelly-like substance filling the cell, containing organelles.

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    Nucleus

    The part of the cell that stores DNA and regulates cellular activities.

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    Mitochondria

    Known as the powerhouse of the cell; site of ATP production.

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    Endoplasmic Reticulum (ER)

    An organelle that synthesizes proteins (Rough ER) and lipids while detoxifying substances (Smooth ER).

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    Golgi Apparatus

    Modifies, packages, and transports proteins and lipids.

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    Lysosomes

    Organelles that contain enzymes for digestion and waste removal.

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    Ribosomes

    Cell structures that synthesize proteins.

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    Chloroplasts

    Organelles in plant cells where photosynthesis occurs.

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    Vacuoles

    Storage organelles that store water, nutrients, and waste, especially large in plant cells.

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    Cytoskeleton

    Provides structure and facilitates movement within the cell.

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    Prokaryotic Cells

    Simple, unicellular organisms without a true nucleus or membrane-bound organelles, such as bacteria.

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    Eukaryotic Cells

    Complex cells with a true nucleus and membrane-bound organelles, found in plants, animals, fungi, and protists.

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    Somatic Cells

    Cells that make up the body, such as skin and muscle cells.

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    Germ Cells

    Reproductive cells, such as sperm and egg cells.

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    Microvilli

    Structures on cells that increase surface area for absorption, seen in intestinal cells.

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    Cilia and Flagella

    Hair-like structures that aid in movement and locomotion.

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    Pseudopodia

    Extensions of the cytoplasm used for movement or engulfing food in some cells like amoeba.

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    Cell Wall Thickening

    Modification in plant cells providing strength and protection.

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    Plasmodesmata

    Channels between plant cells for transport and communication.

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    Keratinization

    Formation of a protective layer in skin cells.

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    Endospores

    Structures formed by prokaryotes like bacteria under harsh conditions for survival.

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    Study Notes

    General Biology 1 - Quarter 1, Module 1: Cells

    • General Biology 1, Quarter 1, Module 1: Cells - by Raffy R. Padrigano, LPT

    Lesson 1: Cell Theory

    • Cell Theory: A foundational concept in biology, describing the properties of cells.
    • Cell Theory Principles:
      • All living organisms are composed of cells. Cells are the basic units of life.
      • The cell is the smallest unit of life; it is the basic structural and functional unit in living organisms.
      • All cells arise from pre-existing cells via cell division (e.g., mitosis or binary fission).

    Contributions to Cell Theory

    • Robert Hooke (1665): First observed and named "cells" in cork tissue.
    • Anton van Leeuwenhoek: Observed living cells, including bacteria, using a simple microscope.
    • Matthias Schleiden and Theodor Schwann (1839): Proposed that plants and animals are made of cells.
    • Rudolf Virchow (1855): Stated that all cells come from pre-existing cells (Omnis cellula e cellula).

    Lesson 2: Cell Structure and Functions

    • Cells are comprised of distinct parts with specific roles, ensuring efficient functioning.
    • Cell Structures and Functions:
      • Plasma Membrane: A semi-permeable barrier made of a lipid bilayer; controls substance movement in and out of the cell.
      • Cytoplasm: Jelly-like substance filling the cell; includes organelles.
      • Nucleus: Houses genetic material (DNA), regulating cellular activities like growth, metabolism, and reproduction.

    Organelles in Eukaryotic Cells

    • Mitochondria: The cell's powerhouse; site of ATP (energy) production.
    • Endoplasmic Reticulum (ER):
      • Rough ER: Studded with ribosomes; synthesizes proteins.
      • Smooth ER: Synthesizes lipids and detoxifies substances.
    • Golgi Apparatus: Modifies, packages, and transports proteins and lipids.
    • Lysosomes: Contain enzymes for digestion and waste removal.
    • Ribosomes: Synthesize proteins.
    • Chloroplasts (plant cells only): Site of photosynthesis.
    • Vacuoles (plant cells primarily): Store water, nutrients, and waste (large in plants).
    • Cytoskeleton: Provides structural support and facilitates movement.

    Lesson 3: Prokaryotic vs. Eukaryotic Cells

    • Prokaryotic Cell: A simple, unicellular organism lacking a true nucleus and membrane-bound organelles. Genetic material is in a nucleoid region; examples are bacteria and archaea.

    • Eukaryotic Cell: A complex cell with a true nucleus enclosed by a nuclear membrane and membrane-bound organelles; found in multicellular and some unicellular organisms like plants, animals, fungi, and protists

    • Prokaryotic vs. Eukaryotic Cells (Summary):

      Feature Prokaryotic Cells Eukaryotic Cells
      Size Small (1-10 µm) Larger (10-100 µm)
      Nucleus Absent Present
      DNA Circular, in nucleoid Linear, in nucleus
      Organelles No membrane-bound Membrane-bound
      Examples Bacteria, Archaea Plants, animals, fungi, protists
      Reproduction Binary fission Mitosis and meiosis

    Lesson 4: Cell Types

    • Cells are categorized based on organism types and functions.
    • Based on Organisms:
      • Prokaryotic Cells: Found in bacteria and archaea.
      • Eukaryotic Cells: Found in plants, animals, fungi, and protists.
    • Based on Function:
      • Somatic Cells: Body cells (e.g., skin, muscle).
      • Germ Cells: Reproductive cells (e.g., sperm, egg).
    • Specialized Cells:
      • Red Blood Cells (RBCs): Transport oxygen.
      • Neurons: Transmit signals in the nervous system.
      • Muscle Cells: Responsible for movement.
      • Plant Cells (e.g., Guard Cells): Regulate gas exchange.

    Lesson 5: Cell Modifications

    • Cells adapt their structures to carry out specific functions.
      • In Animals:
        • Microvilli: Increase surface area for absorption.
        • Cilia and Flagella: Aid in movement.
        • Pseudopodia: Extensions of the cytoplasm for movement and engulfing food.
      • In Plants:
        • Cell Wall Thickening: Provides strength and protection.
        • Plasmodesmata: Channels for transport and communication.
        • Storage Vacuoles: Store nutrients, waste, or water. Keratinization, formation of Endospores

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    Description

    Explore the fundamental concepts of cell theory and its historical contributions in this quiz based on General Biology 1, Quarter 1, Module 1. Learn about the properties of cells, their role as the basic units of life, and key figures like Robert Hooke and Rudolf Virchow who shaped our understanding of cells.

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