Biology: Unicellular Organisms and Cell Structure
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Questions and Answers

Which of the following are unicellular?

  • Protozoans
  • Bacteria
  • Neither A nor B
  • Both A and B (correct)
  • Which of the following do not consist of eukaryotic cells?

  • Bacteria (correct)
  • Animals
  • Fungi
  • Plants
  • The genetic material of a bacterium is located within what structure?

    Nucleoid

    A system of fibers within a bacterium that provides support and serves as a track to move substances around itself is called the _____.

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

    A cellular organelle that reads RNA and assembles amino acids into proteins is called the _____.

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

    The genetic material within the nucleus of a cell, consisting of DNA, RNA, and associated proteins, is collectively known as _____.

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

    A medical lab finds that a particular species of bacteria grows best at temperatures from 16 to 20 degrees Celsius. This range of temperatures is known as the bacteria's _____.

    <p>Optimal range</p> Signup and view all the answers

    What happens to a cell outside of its range of tolerance?

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

    When cells in the solution surrounding them contain equal amounts of solute, the solution is said to be _____.

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

    Which types of transport across the cell membrane requires energy?

    <p>Active transport</p> Signup and view all the answers

    Cell theory is the model that explains the way cells work.

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

    Cells in a colony work together, but cannot live independently from one another.

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

    Both eukaryotic and prokaryotic cells contain organelles.

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

    Photosynthesis happens in the Grana of chloroplast.

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

    Refer to the diagram to the right. Region A is the _____.

    <p>Hydrophilic portion of the lipid bilayer in the cell membrane.</p> Signup and view all the answers

    Diffusion and osmosis are different words that identify the same process.

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

    Osmosis produces equal solution concentrations on both sides of a semipermeable membrane.

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

    Semipermeable membranes allow particles in a solution to pass through in both directions.

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

    Passive transport can move particles from a region of low concentration to a region of high concentration.

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

    What is the model that states life comes from things that aren't alive?

    <p>Spontaneous generation</p> Signup and view all the answers

    What is the model that states all living things are made of cells?

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

    What is the currently accepted model of biology?

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

    What model states that cells come only from other cells?

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

    The model states egg and sperm contain miniature people that grow to adulthood is called _____.

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

    Organisms that consist of only one cell are called _____.

    <p>Unicellular organisms</p> Signup and view all the answers

    The often slimy coating that surrounds the cell wall of bacterium is known as the _____.

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

    Chloroplasts and leucoplasts are examples of a type of organelle known as _____.

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

    Central vacuoles are responsible for maintaining _____, the force of which keeps a cell rigid.

    <p>Turgor pressure</p> Signup and view all the answers

    Rough endoplasmic reticulum is rough because it is studded with ribosomes on its surface.

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

    Nuclei are only found in eukaryotic cells.

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

    Lysosomes are a type of vacuole that contains _____.

    <p>Digestive enzymes</p> Signup and view all the answers

    The Golgi apparatus receives substances from the endoplasmic reticulum and packages them into _____.

    <p>Membrane sacs</p> Signup and view all the answers

    The following are parts of a cell: endoplasmic reticulum, mitochondrion, Golgi apparatus, cilium, nucleus, cell membrane, chromatin, nucleolus. List at least three structures found in plant cells that are not in animal cells.

    <p>All of the above (D)</p> Signup and view all the answers

    Flashcards

    Unicellular organisms

    Organisms consisting of a single cell.

    Prokaryotic cells

    Cells lacking a nucleus and other membrane-bound organelles.

    Bacteria

    Microscopic single-celled organisms lacking a nucleus.

    Nucleoid

    Region in a prokaryotic cell where the DNA is located.

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    Cytoplasmic streaming

    Movement of cytoplasm within a cell.

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    Ribosome

    Organelle that makes proteins.

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    Chromatin

    DNA and proteins within a nucleus.

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    Optimal range (bacteria)

    Temperature range where a bacteria grows best.

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    Isotonic solution

    Solution with equal solute concentrations compared to the inside of the cell.

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    Active transport

    Movement of molecules across a membrane requiring energy.

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    Cell theory

    Model stating that all living things are made of cells.

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    Cell wall

    Rigid outer layer of plant cells.

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    Central vacuole

    Fluid-filled sac in plant cells that maintains turgor pressure.

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    Chloroplast

    Organelle where photosynthesis occurs.

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    Plastids

    Group of organelles including chloroplasts and leucoplasts.

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    Turgor pressure

    Pressure that keeps plant cells rigid.

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    Endoplasmic Reticulum (Rough)

    Network of membranes studded with ribosomes.

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    Mitochondria

    Organelle that produces energy (ATP).

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    Golgi apparatus

    Organelle that modifies, sorts, and packages proteins.

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    Lysosome

    Organelle containing digestive enzymes.

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    Cell membrane

    Outer boundary of the cell, controlling what enters and leaves.

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    Diffusion

    Movement of particles from high to low concentration.

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    Osmosis

    Movement of water across a semipermeable membrane.

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    Passive transport

    Movement of molecules across membrane without energy.

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    Semipermeable membrane

    Membrane allowing some particles to pass through but not others.

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    Capsule of bacteria

    Protective slimy layer surrounding cell wall.

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    Cell Theory

    States all life consists of cells, cells come from cells, and cells are basic units of life.

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    Spontaneous generation

    Outdated idea that life arises from non-living matter.

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    Study Notes

    Unicellular Organisms

    • Bacteria and protozoans are unicellular.

    Prokaryotic Cells

    • Bacteria are not eukaryotic.
    • Bacterial genetic material is located in the nucleoid.
    • Cytoplasmic streaming is a system of fibers within a bacterium to move substances.
    • Ribosomes read RNA and assemble amino acids into proteins

    Cell Structures

    • Chromatin: DNA, RNA, and proteins in the nucleus.
    • Optimal Temperature Range: A species of bacteria grows best between 16-20°C.
    • Isotonic Solution: Solutions containing equal amounts of solute, maintaining cell balance.
    • Active Transport: Requires energy to move substances across the cell membrane.
    • **Cell Theory:**Explains how cells work. It is false that cells in a colony can't live independently.
    • Eukaryotic and prokaryotic cells share organelles (true).
    • Photosynthesis: Happens in chloroplasts' grana (true).
    • Lipid Bilayer: The hydrophobic portion of the lipid bilayer is region 'a' in the diagram.
    • Diffusion and Osmosis: Different terms, but the same process; their definitions are false (Diffusion and osmosis are not the same process, they are both forms of passive transport).
    • Semipermeable Membrane: Allows particle movement, in both directions (true).
    • Passive Transport: Cannot move particles from low to high concentration areas (false).
    • Spontaneous Generation: Life arises from non-living things (incorrect model).
    • Cell Theory: All living things are made of cells (correct model).
    • Preformation Model: Eggs and sperm contain miniature people.
    • Unicellular Organisms: Organisms consisting of a single cell.
    • Capsule: A slimy coating surrounding the cell wall of a bacterium.
    • Plastids: These include chloroplasts and leucoplasts.
    • Turgor Pressure: Maintained by central vacuoles, providing cell rigidity.
    • Rough Endoplasmic Reticulum: Studded with ribosomes.
    • Nuclei: Found only in eukaryotic cells.
    • Lysosomes: Vacuoles with digestive enzymes.
    • Golgi Apparatus: Receives substances from the endoplasmic reticulum and packages them.
    • Cell Structures (List): Endoplasmic reticulum, mitochondrion, Golgi apparatus, cilium, nucleus, cell membrane, chromatin, nucleolus
    • Plant Cell-Specific Structures: Cell wall, central vacuole, and chloroplasts.

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    Description

    Explore the fascinating world of unicellular organisms, including bacteria and protozoans. This quiz covers topics such as prokaryotic cells, cell structures, and vital processes like photosynthesis and active transport. Test your knowledge about the fundamental principles of cell biology.

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