Cell Structure and Functions Quiz
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Questions and Answers

What is the role of the cell membrane?

  • Synthesize proteins
  • Stores genetic information
  • Produces energy for the cell
  • Regulates what comes in and out of the cell (correct)
  • What is the phospholipid bilayer?

    A layer of phospholipids where hydrophilic heads face outwards and hydrophobic tails are protected.

    What are peripheral proteins?

    Proteins that attach to the cell membrane and act as receptors, enzymes, or anchors.

    What are transmembrane proteins?

    <p>Proteins located in the cell membrane that allow passage of certain substances.</p> Signup and view all the answers

    What are carbohydrate tags?

    <p>Receptors that provide information on the destination of a certain molecule.</p> Signup and view all the answers

    What are attached ribosomes?

    <p>Ribosomes attached to the rough endoplasmic reticulum that make proteins intended for other cells.</p> Signup and view all the answers

    What is the function of free ribosomes?

    <p>Ribosomes that are free within the cytoplasm and produce proteins for cell activity.</p> Signup and view all the answers

    What is the nucleus?

    <p>The large structure within the cell that contains genetic information.</p> Signup and view all the answers

    What is chromatin?

    <p>Genetic material in the nucleus made up of DNA strands wrapped around proteins.</p> Signup and view all the answers

    What are histones?

    <p>Proteins wrapped in DNA that make up chromatin.</p> Signup and view all the answers

    What is the nucleolus?

    <p>A dense area within the nucleus that produces ribosomes and RNA.</p> Signup and view all the answers

    What is the nuclear envelope?

    <p>A double membrane layer that protects the nucleus.</p> Signup and view all the answers

    What are nuclear pores?

    <p>Holes located on the nuclear envelope that allow the passage of substances into and out of the nucleus.</p> Signup and view all the answers

    What is the rough endoplasmic reticulum?

    <p>The organelle that modifies and transports proteins made by ribosomes.</p> Signup and view all the answers

    What is the smooth endoplasmic reticulum?

    <p>The organelle that makes lipids and detoxifies certain substances.</p> Signup and view all the answers

    What is lipid synthesis?

    <p>The process by which the smooth endoplasmic reticulum produces lipids.</p> Signup and view all the answers

    What are mitochondria?

    <p>Organelles that convert energy from food particles into ATP.</p> Signup and view all the answers

    What is the endosymbiotic theory?

    <p>The theory that mitochondria were once free prokaryotes engulfed by a eukaryote.</p> Signup and view all the answers

    What are animal vacuoles?

    <p>Storage spaces for food, waste, and water within animal cells.</p> Signup and view all the answers

    What is the central vacuole?

    <p>A storage space within a plant cell that holds water, food, and waste.</p> Signup and view all the answers

    What is the golgi apparatus?

    <p>The organelle that labels and packages proteins using carbohydrate tags.</p> Signup and view all the answers

    What are centrioles?

    <p>Organelles that aid in cell division, found only in animal cells.</p> Signup and view all the answers

    What are chloroplasts?

    <p>Organelles found only in plant cells that convert sunlight into energy-rich food.</p> Signup and view all the answers

    What is photosynthesis?

    <p>The process by which chloroplasts use sunlight to produce energy-rich food for the plant.</p> Signup and view all the answers

    What is diffusion?

    <p>The process by which molecules move from an area of high concentration to an area of low concentration.</p> Signup and view all the answers

    What is osmosis?

    <p>The diffusion of water through a permeable membrane.</p> Signup and view all the answers

    What is facilitated diffusion?

    <p>When large or charged particles enter the cell through transport proteins.</p> Signup and view all the answers

    What is the cytoskeleton?

    <p>A structure composed of microtubules that provides structure and transport within a cell.</p> Signup and view all the answers

    What is the cell wall?

    <p>A structure only present in plant cells that provides support and protection.</p> Signup and view all the answers

    What is cellulose?

    <p>A polysaccharide that makes up a plant's cell wall.</p> Signup and view all the answers

    Study Notes

    Cell Structure and Functions

    • Cell Membrane: Regulates substances entering and exiting the cell and catalyzes reactions.
    • Phospholipid Bilayer: Composed of hydrophilic heads facing outward that protect hydrophobic tails, forming a barrier.
    • Peripheral Proteins: Attached to the membrane; function as receptors, enzymes, or structural anchors.
    • Transmembrane Proteins: Span the membrane, facilitating the passage of specific substances into and out of the cell.

    Cellular Identification

    • Carbohydrate Tags: Serve as receptors indicating the intended destination of molecules.
    • Attached Ribosomes: Located on rough endoplasmic reticulum, these ribosomes synthesize proteins for export to other cells.
    • Free Ribosomes: Float in the cytoplasm, producing proteins necessary for the cell's internal functions.

    Genetic Material and Nucleus

    • Nucleus: The control center containing genetic material crucial for cell function.
    • Chromatin: DNA strands complexed with proteins, forming the genetic material within the nucleus.
    • Histones: Proteins around which DNA coils, playing a role in packaging chromatin.
    • Nucleolus: Produces ribosomes and RNA, found within the nucleus.
    • Nuclear Envelope: Double membrane providing protection to the nucleus.
    • Nuclear Pores: Allow selective exchange of substances between the nucleus and cytoplasm.

    Organelles and Their Functions

    • Rough Endoplasmic Reticulum (RER): Modifies and transports proteins synthesized by attached ribosomes.
    • Smooth Endoplasmic Reticulum (SER): Synthesizes lipids, detoxifies substances, and processes cholesterol and steroids.
    • Mitochondria: Convert food energy into ATP, essential for cellular processes.
    • Endosymbiotic Theory: Proposes that mitochondria originated from free-living prokaryotes engulfed by eukaryotic cells.
    • Animal Vacuoles: Serve as storage for food, waste, and water in animal cells.
    • Central Vacuole: A large storage organelle in plant cells for water, food, and waste, providing turgor pressure for structural support.

    Golgi Apparatus and Special Organelles

    • Golgi Apparatus: Modifies, sorts, and packages proteins using carbohydrate tags for transport.
    • Centrioles: Unique to animal cells, assist in cell division by organizing microtubules.
    • Chloroplasts: Present in plant cells, capture sunlight to produce energy-rich food via photosynthesis.

    Processes and Transportation

    • Photosynthesis: Conversion of solar energy into chemical energy in the form of glucose by chloroplasts.
    • Diffusion: Movement of molecules from high to low concentration until equilibrium is achieved.
    • Osmosis: Specific type of diffusion involving water across a semipermeable membrane.
    • Facilitated Diffusion: Transport of large or charged molecules through specific proteins embedded in the membrane.

    Structural Components

    • Cytoskeleton: Provides structural support and facilitates transport within the cell, made up of microtubules.
    • Cell Wall: A rigid outer layer exclusive to plant cells, offering support and protection for organelles.
    • Cellulose: A polysaccharide forming the primary component of the plant cell wall, providing strength and rigidity.

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    Description

    Test your knowledge on cell structure and functions with this quiz. Explore topics like the cell membrane, ribosomes, and the nucleus. Perfect for students learning about cellular biology and genetics.

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