Cell Theory and Cell Structures
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Questions and Answers

What is the main function of the cell wall?

  • Maintain shape, support, and protect the cell (correct)
  • Produce energy
  • Control the entry and exit of materials
  • Synthesize proteins
  • Which organelle is responsible for protein synthesis?

  • Golgi complex
  • Ribosome (correct)
  • Nucleus
  • Rough endoplasmic reticulum
  • What is the primary role of the mitochondria?

  • Transport lipids and steroids
  • Control life activities
  • Maintain water balance
  • Produce energy (correct)
  • Which organelle is involved in the packaging and secretion of substances?

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

    Which structure is primarily responsible for controlling the entry and exit of materials in and out of the cell?

    <p>Plasma membrane (A)</p> Signup and view all the answers

    Which scientists are credited with the development of cell theory?

    <p>Schleiden, Schwann, and Radolf Virchow (D)</p> Signup and view all the answers

    Which of the following accurately describes a component of the plant cell?

    <p>Chloroplast is responsible for photosynthesis (C)</p> Signup and view all the answers

    What is the main function of the vacuole in a plant cell?

    <p>Storage of materials (A)</p> Signup and view all the answers

    Which part of the animal cell is responsible for control and regulation?

    <p>Nucleus (C)</p> Signup and view all the answers

    What distinguishes a plant cell from an animal cell?

    <p>Cell wall and chloroplasts in plant cells (D)</p> Signup and view all the answers

    What defines cell growth?

    <p>Irreversible increase in size and dry mass (D)</p> Signup and view all the answers

    Which statement correctly describes mitosis?

    <p>Involves one cell division process (B)</p> Signup and view all the answers

    What is the outcome of meiosis regarding chromosomal number in daughter cells?

    <p>Daughter cells receive half the chromosomal number as the mother cell (B)</p> Signup and view all the answers

    During which process does variation occur?

    <p>Meiosis (D)</p> Signup and view all the answers

    Which type of cells undergo meiosis?

    <p>Only diploid cells (B)</p> Signup and view all the answers

    Flashcards

    Cell theory

    The structural and functional unit of an organism is a cell. All organisms are made up of one or more cells. New cells are formed from pre-existing cells.

    Cell wall

    A rigid outer layer surrounding the cell. It provides support and protection.

    Cell membrane

    A thin layer surrounding the cytoplasm. It controls what enters and exits the cell.

    Cytoplasm

    The material within the cell membrane, excluding the nucleus. It is a gel-like substance where many chemical reactions occur.

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    Chloroplast

    A structure only found in plant cells, responsible for photosynthesis. It converts light energy into chemical energy.

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    What is the function of mitochondria?

    The powerhouse of the cell, responsible for generating energy through cellular respiration.

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    What is the role of the endoplasmic reticulum (ER)?

    A network of interconnected membranes that help transport materials and synthesize proteins.

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    What is the function of a vacuole in a plant cell?

    A plant cell structure that helps maintain water balance, store nutrients, and give color to the cell.

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    What is the cell wall and its function?

    A rigid outer layer present in plant cells that provides structural support and protection.

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    What is the function of the plasma membrane?

    The boundary of the cell, responsible for controlling the movement of substances in and out of the cell.

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    Mitosis

    A process that occurs in both haploid and diploid cells, resulting in two daughter cells with the same number of chromosomes as the parent cell. This type of division is responsible for growth and asexual reproduction.

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    Meiosis

    A special type of cell division that occurs only in diploid cells. It involves two divisions, resulting in four daughter cells, each with half the number of chromosomes as the parent cell. This process produces gametes (sperm and egg cells).

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    Cell Growth

    The increase in size and dry mass of a cell. It's an irreversible process that occurs before a cell divides.

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    Cell Division

    The process by which a cell divides into two identical daughter cells. It's an essential part of growth, repair, and asexual reproduction.

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    Chromosome Number in Mitosis

    During this process, the number of chromosomes in the daughter cells remains the same as in the parent cell. This ensures that each new cell has a complete set of genetic instructions.

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    Study Notes

    Cell Theory

    • Scientists who discovered cell theory are Schleiden, Schwann, and Rudolf Virchow
    • The concept of cell theory is that the structural and functional unit of an organism is a cell
    • All organisms are made up of one or more cells
    • New cells are formed from pre-existing cells

    Observed through Light Microscope

    • Animal Cell example: Cheek cell

    • Plant cell example: Onion peel

    • Diagrams show the basic structures of both animal and plant cells.

    • Animal cell has a cell membrane and cytoplasm with a nucleus.

    • Plant cells have similar structures to an animal cell but also include a cell wall, vacuoles, and chloroplasts.

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    Description

    Explore the foundation of cell theory, including its key contributors like Schleiden, Schwann, and Virchow. Learn about the differences between animal and plant cells, their structures, and how they function as the basic units of life.

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