Cell Ultrastructure Quiz
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Questions and Answers

What is the basic unit of life?

A cell

What is the study of cell anatomy revealed by an electron microscope called?

Cell ultrastructure

What type of microscope uses beams of electrons to create images?

  • Light microscope
  • Atomic force microscope
  • Scanning tunneling microscope
  • Electron microscope (correct)
  • What is the primary component of the cell membrane?

    <p>Phospholipid bilayer</p> Signup and view all the answers

    The nucleus is the site of cellular respiration.

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

    What is the function of the nucleus in a cell?

    <p>Growth and reproduction</p> Signup and view all the answers

    Which of the following best describes the function of the nucleolus?

    <p>Production of ribosomes (A)</p> Signup and view all the answers

    Which type of electron microscope passes electrons through a specimen?

    <p>Transmission electron microscope (A)</p> Signup and view all the answers

    Which type of electron microscope provides a three-dimensional image of the specimen's surface?

    <p>Scanning electron microscope (A)</p> Signup and view all the answers

    Nucleus pores allow both DNA and RNA to pass through.

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

    What is the jellylike substance found inside the cell, excluding the organelles?

    <p>Cytosol</p> Signup and view all the answers

    What is the main function of mitochondria?

    <p>Production of energy</p> Signup and view all the answers

    Mitochondria have their own loop of DNA.

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

    What is the function of ribosomes in a cell?

    <p>Protein synthesis</p> Signup and view all the answers

    Where does photosynthesis occur in plant cells?

    <p>Chloroplasts</p> Signup and view all the answers

    Chloroplasts have their own loop of DNA.

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

    What is the function of the cell wall in plant cells?

    <p>Support and structure</p> Signup and view all the answers

    What is the primary function of the cell membrane?

    <p>Regulating the passage of substances into and out of the cell</p> Signup and view all the answers

    Animal cells possess a cell wall.

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

    Plant cells contain chloroplasts.

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

    Animal cells contain a large central vacuole.

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

    Which of the following is NOT a characteristic of a plant cell?

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

    Which of the following is NOT a characteristic of an animal cell?

    <p>Cell wall (A)</p> Signup and view all the answers

    Flashcards

    Cell

    A basic unit of life that starts as stem cells and divides to grow.

    Cell ultrastructure

    The cellular anatomy revealed by an electron microscope.

    Electron microscope

    Microscope that forms an image by focusing beams of electrons onto a specimen.

    Phospholipid bilayer

    Cell membrane structure made of phosphate heads (water-loving) and lipid tails (water-hating).

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    Nucleus

    A part of the cell containing DNA and RNA responsible for growth and reproduction.

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    Types of electron microscopes

    1. TEM: transmission - passes electrons through a specimen for black and white images; 2. SEM: scanning - passes electrons across for 3D shapes.
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    Nucleus pores

    Allows RNA to pass but restricts DNA due to size differences.

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    Cytoplasm

    Jellylike fluid inside the cell where organelles are suspended, known as cytosol when without organelles.

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    Mitochondria

    Site of cellular respiration producing energy, containing its own loop of DNA.

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    Ribosomes

    Tiny structures making proteins without a membrane enclosing them.

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    Chloroplast

    Organelle in plant and algae cells where photosynthesis occurs, containing its own loop of DNA.

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    Cell wall

    Rigid structure surrounding the cell membrane that provides support to the cell.

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    Cell membrane

    Structure that controls which substances enter or leave, providing support and retaining contents.

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    Plant cell

    Contains a cell wall, chloroplasts, and a large vacuole.

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    Animal cell

    Does not have a cell wall or chloroplasts and contains a small vacuole.

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    Plant vs Animal

    Plant cells have a cell wall, chloroplasts, and a large vacuole; animal cells do not have these features.

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    Cytosol

    The fluid part of the cytoplasm without organelles.

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    Nucleolus

    A small structure within the nucleus where ribosomal RNA is produced.

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    Cell growth

    The process wherein cells increase in size and number through division.

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    Cell division

    The process where a cell splits to form two daughter cells.

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    Photosynthesis

    The process in chloroplasts where sunlight is converted into chemical energy.

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    Cellular respiration

    The process that converts glucose into energy in mitochondria.

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    Prokaryotic cells

    Simple cells without a nucleus or membrane-bound organelles.

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    Eukaryotic cells

    Complex cells with a nucleus and organelles, including animal and plant cells.

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    Vacuole

    A storage organelle in cells; large in plant cells and small in animal cells.

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    Organelle

    Specialized structures within a cell that perform specific functions.

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    Chromatin

    Strands of DNA in the nucleus that condense to form chromosomes during cell division.

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    Study Notes

    Cell Ultrastructure

    • A cell is the fundamental unit of life, originating from stem cells and multiplying to grow.
    • Cell ultrastructure refers to the microscopic cellular anatomy observable using an electron microscope.
    • An electron microscope forms images by focusing electron beams on a specimen.
    • Two main types exist: transmission electron microscopy (TEM) shows a specimen's internal structure and scanning electron microscopy (SEM) creates a three-dimensional view.
    • The cell's plasma membrane is a phospholipid bilayer, with embedded proteins, forming a boundary. Phospholipids have water-loving heads and water-fearing tails.
    • The nucleus, a crucial organelle, contains DNA (in chromatin form) and RNA, controlling cell growth and reproduction. It's also present in the cytoplasm and includes the nucleolus.
    • Nucleus pores permit RNA passage, but not DNA, due to size differences.
    • Cytoplasm is the jelly-like fluid in the cell, housing organelles and the cytosol (without organelles).
    • Mitochondria are the cell's energy producers, carrying out cellular respiration and possessing their own DNA loop.
    • Ribosomes synthesize proteins and lack a surrounding membrane.
    • Chloroplasts conduct photosynthesis in plant and algae cells and contain their own DNA loop.
    • A cell wall provides structural support in plant cells.
    • The cell membrane regulates material passage in and out of the cell, maintaining internal balance and offering cell support and retention.
    • Plant cells have a cell wall, chloroplasts, and a large vacuole, unlike animal cells which lack a cell wall or chloroplasts and have a small vacuole.

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    Description

    Test your knowledge about cell ultrastructure and its components with this quiz. Learn about the roles of the plasma membrane, nucleus, and different types of electron microscopy. Perfect for biology students interested in cellular anatomy!

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