Gr 9 Natural Sciences Ch 1: Cell structure
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Questions and Answers

What is the primary function of mitochondria?

  • Storage of nutrients and waste
  • Photosynthesis
  • Cellular respiration (correct)
  • Protein synthesis

    • What shape do red blood cells have to assist their function?

  • Cuboidal
  • Biconcave (correct)
  • Spherical
  • Columnar

    • What is the main role of vacuoles in plant cells?

  • Regulating cell division
  • Storage and maintaining turgor pressure (correct)
  • Energy production
  • Gene expression

    • Which of the following best describes the cytoplasm?

    <p>Contents within the cell membrane, excluding the nucleus</p> Signup and view all the answers

    What defines selective permeability in a cell membrane?

    <p>The property that allows some substances to pass while blocking others</p> Signup and view all the answers

    What does DNA stand for?

    <p>Deoxyribonucleic Acid</p> Signup and view all the answers

    What is cytology?

    <p>The scientific study of cells</p> Signup and view all the answers

    What is a key function of protoplasm in a cell?

    <p>Comprising the living content of a cell</p> Signup and view all the answers

    What is the primary function of the cell membrane?

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

    Which of the following is a characteristic feature of eukaryotic cells?

    <p>Presence of a nuclear membrane</p> Signup and view all the answers

    Which component of the cell is responsible for containing organelles?

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

    What type of cells are bacteria categorized as?

    <p>Prokaryotic cells</p> Signup and view all the answers

    What is the role of the nucleolus within the nucleus?

    <p>To synthesize ribosomal RNA</p> Signup and view all the answers

    Which structure in eukaryotic cells contains the genetic material?

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

    How do cells specialize in function and structure?

    <p>Through differentiation based on stimuli</p> Signup and view all the answers

    Which of the following organelles is found in the cytoplasm of a eukaryotic cell?

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

    What is the primary reason for the biconcave shape of red blood cells?

    <p>To increase surface area for oxygen transport</p> Signup and view all the answers

    What is one of the structural features of mitochondria?

    <p>Folding of the inner membrane into cristae</p> Signup and view all the answers

    How does a vacuole contribute to cell function in plants?

    <p>By storing nutrients and maintaining turgor pressure</p> Signup and view all the answers

    What encompasses the living content of a cell?

    <p>Cytoplasm and nucleus combined</p> Signup and view all the answers

    Which term best describes the property of cell membranes that permits selective passage of substances?

    <p>Selective Permeability</p> Signup and view all the answers

    What role does DNA primarily serve in living organisms?

    <p>Containment of genetic information</p> Signup and view all the answers

    What study focuses specifically on the structure and function of cells?

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

    How do variations in DNA contribute to biological diversity?

    <p>By leading to differences in DNA sequences</p> Signup and view all the answers

    What is the defining feature of eukaryotic cells?

    <p>Presence of a membrane-bound nucleus</p> Signup and view all the answers

    Which of the following is not a common component of all cells?

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

    Which structure is responsible for regulating movement in and out of the cell?

    <p>Cell membrane</p> Signup and view all the answers

    What role does the nucleolus play within the nucleus?

    <p>Synthesis of ribosomal RNA</p> Signup and view all the answers

    What is the function of the cytosol in a cell?

    <p>Medium for biochemical reactions</p> Signup and view all the answers

    How are prokaryotic cells primarily differentiated from eukaryotic cells?

    <p>Lack of a membrane-bound nucleus</p> Signup and view all the answers

    Which of the following best describes organelles?

    <p>Structures that perform specific functions</p> Signup and view all the answers

    Which type of cell specializes in transmitting electrical signals?

    <p>Nerve cells</p> Signup and view all the answers

    What distinguishes eukaryotic cells from prokaryotic cells?

    <p>Eukaryotic cells have a defined nucleus.</p> Signup and view all the answers

    Which structure serves as the control center of a eukaryotic cell?

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

    What is one of the main functions of the cell membrane?

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

    Which component is not typically found in prokaryotic cells?

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

    Which organelle is responsible for energy production within a eukaryotic cell?

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

    What is the primary component of the cytoplasm?

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

    How do specialized cells differ from non-specialized cells?

    <p>Specialized cells perform unique functions.</p> Signup and view all the answers

    What is a key structural feature of the nuclear membrane?

    <p>It contains pores for material exchange.</p> Signup and view all the answers

    What is the primary role of vacuoles in plant cells, apart from storage?

    <p>Maintaining turgor pressure</p> Signup and view all the answers

    Which component is primarily responsible for energy production in a cell?

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

    What best describes cellular respiration?

    <p>The conversion of glucose and oxygen into energy</p> Signup and view all the answers

    Which term refers to the living content of a cell?

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

    What do variations in DNA primarily contribute to?

    <p>Biological diversity</p> Signup and view all the answers

    Which part of the cell membrane allows selective movement of substances?

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

    Which microscope feature is essential for studying microscopic cells?

    <p>High magnification capability</p> Signup and view all the answers

    What is the significance of cristae in mitochondria?

    <p>Increase surface area for energy production</p> Signup and view all the answers

    What is a distinguishing feature of eukaryotic cells compared to prokaryotic cells?

    <p>Defined nucleus enclosed by a membrane</p> Signup and view all the answers

    Which of the following correctly identifies the composition of the cell membrane?

    <p>A thin, flexible layer composed of lipids and proteins</p> Signup and view all the answers

    What is the main role of cytoplasm within a cell?

    <p>To house organelles and facilitate chemical reactions</p> Signup and view all the answers

    Which of the following statements best describes prokaryotic cells?

    <p>Lack a membrane-enclosed nucleus and organelles</p> Signup and view all the answers

    What structure within a eukaryotic cell regulates various cellular activities?

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

    Which type of cells typically shows specialization in function, such as transmitting electrical signals?

    <p>Animal nerve cells</p> Signup and view all the answers

    What is the primary component of the cytoplasm that consists of water, salts, and organic molecules?

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

    What characterizes the nucleolus found within the nucleus of eukaryotic cells?

    <p>Synthesizes ribosomal RNA</p> Signup and view all the answers

    What characteristic of red blood cells enhances their ability to carry oxygen?

    <p>Biconcave shape to increase surface area</p> Signup and view all the answers

    Which function of vacuoles is essential for plant cells?

    <p>Maintaining turgor pressure to support cell structure</p> Signup and view all the answers

    Which part of the mitochondria is primarily responsible for increasing the surface area for energy production?

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

    What role does cellular respiration play in cells?

    <p>Generates usable energy from glucose and oxygen</p> Signup and view all the answers

    Which of the following options best represents a characteristic of DNA?

    <p>It is the hereditary material that determines inherited traits</p> Signup and view all the answers

    What distinguishes protoplasm from cytoplasm?

    <p>Protoplasm comprises both the cytoplasm and the nucleus</p> Signup and view all the answers

    What is the significance of selective permeability in a cell membrane?

    <p>It ensures that only essential nutrients and ions can pass through</p> Signup and view all the answers

    How do variations in DNA contribute to evolutionary diversity?

    <p>Through mutations that introduce new genetic sequences</p> Signup and view all the answers

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