Cell Structure and Functions

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Questions and Answers

Which organelle is responsible for generating energy for the cell?

  • Nucleus
  • Ribosomes
  • Mitochondria (correct)
  • Cytoplasm

Prokaryotic cells lack a nucleus.

True (A)

Name one function of cells related to metabolism.

Metabolism involves various processes like energy production, growth, and waste elimination in cells.

Microorganisms can be single-celled or colonial, and they are typically of ____.

<p>microscopic size</p> Signup and view all the answers

Match the type of microorganism with an example:

<p>Bacteria = E. coli Viruses = Influenza Fungi = Yeast Protists = Algae</p> Signup and view all the answers

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Study Notes

Cells

  • Cell Structure:
    • Cell membrane: thin layer of lipid and protein molecules that surrounds the cell
    • Cytoplasm: jelly-like substance inside the cell membrane where many cellular activities take place
    • Nucleus: control center of the cell where DNA is stored
    • Mitochondria: organelles responsible for generating energy for the cell
    • Ribosomes: sites of protein synthesis
  • Cell Functions:
    • Growth and repair
    • Response to stimuli
    • Reproduction
    • Metabolism
    • Transportation of materials
  • Cell Types:
    • Prokaryotic cells (e.g. bacteria): lack nucleus and other membrane-bound organelles
    • Eukaryotic cells (e.g. plants, animals, fungi): have nucleus and membrane-bound organelles

Microorganisms

  • Types of Microorganisms:
    • Bacteria
    • Viruses
    • Fungi (e.g. yeast, mold)
    • Protists (e.g. protozoa, algae)
  • Characteristics of Microorganisms:
    • Microscopic size
    • Single-celled or colonial
    • Can be found almost everywhere
    • Can be beneficial or harmful to humans
  • Microorganism Importance:
    • Decomposition and nutrient cycling
    • Food production (e.g. yogurt, bread)
    • Human health (e.g. gut microbiome)
    • Environmental applications (e.g. bioremediation)
  • Microorganism Interactions:
    • Symbiotic relationships (e.g. mutualism, commensalism, parasitism)
    • Pathogenic interactions (e.g. disease-causing bacteria, viruses)

Microscopy and Microbiology Techniques

  • Microscopy:
    • Light microscopy: uses visible light to magnify specimens
    • Electron microscopy: uses electron beams to magnify specimens
  • Microbiology Techniques:
    • Staining: uses dyes to enhance visibility of microorganisms
    • Culturing: grows microorganisms in controlled environments
    • Microbial testing: identifies and characterizes microorganisms

Cell Structure and Functions

  • Cell membrane is a thin layer of lipid and protein molecules that surrounds the cell
  • Cytoplasm is a jelly-like substance inside the cell membrane where many cellular activities take place
  • Nucleus is the control center of the cell where DNA is stored
  • Mitochondria are organelles responsible for generating energy for the cell
  • Ribosomes are sites of protein synthesis
  • Cell functions include growth and repair, response to stimuli, reproduction, metabolism, and transportation of materials

Cell Types

  • Prokaryotic cells lack a nucleus and other membrane-bound organelles, and are found in bacteria
  • Eukaryotic cells have a nucleus and membrane-bound organelles, and are found in plants, animals, and fungi

Microorganisms

  • Types of microorganisms include bacteria, viruses, fungi, and protists
  • Microorganisms are characterized by their microscopic size, single-celled or colonial structure, and ability to be found almost everywhere
  • Microorganisms can be beneficial or harmful to humans
  • Importance of microorganisms includes decomposition and nutrient cycling, food production, human health, and environmental applications

Microorganism Interactions

  • Symbiotic relationships include mutualism, commensalism, and parasitism
  • Pathogenic interactions involve disease-causing bacteria and viruses

Microscopy and Microbiology Techniques

  • Light microscopy uses visible light to magnify specimens
  • Electron microscopy uses electron beams to magnify specimens
  • Microbiology techniques include staining, culturing, and microbial testing
  • Staining uses dyes to enhance visibility of microorganisms
  • Culturing grows microorganisms in controlled environments
  • Microbial testing identifies and characterizes microorganisms

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