The Cell Theory

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Questions and Answers

According to the cell theory, what are the main ideas regarding cells?

  • Cells are not the building blocks of organisms
  • Cells can only be found in animals
  • Cells are the largest units of life
  • All living organisms are composed of cells (correct)

True or False: Cells are the smallest units of life.

True (A)

What process produces ATP in the mitochondria?

cellular respiration

_______ synthesizes proteins, while smooth ER synthesizes lipids.

<p>Rough ER</p> Signup and view all the answers

Match the cell organelles with their functions:

<p>Nucleus = Contains genetic material, controls cell activities Mitochondria = Powerhouse of the cell, produces ATP through cellular respiration Endoplasmic Reticulum (ER) = Rough ER synthesizes proteins, smooth ER synthesizes lipids Golgi Apparatus = Modifies, sorts, and packages proteins and lipids for secretion Lysosomes = Digests waste materials and cellular debris Ribosomes = Site of protein synthesis Cytoplasm = Gel-like substance where organelles are suspended and many cellular processes occur</p> Signup and view all the answers

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Study Notes

The Cell Theory

  • All living organisms, from unicellular bacteria to multicellular organisms, are composed of cells, which are the basic structural and functional units of life.
  • Cells are the smallest units of life, exhibiting characteristics such as metabolism, growth, reproduction, and response to stimuli.

Hierarchy of Cells to Organism

  • The hierarchy of cells to organism is: cells -> tissues -> organs -> organ systems -> organism.

Cell Organelles and Their Functions

  • Nucleus: contains genetic material (DNA) and controls cell activities.
  • Mitochondria: produces ATP through cellular respiration, serving as the powerhouse of the cell.
  • Endoplasmic Reticulum (ER): rough ER synthesizes proteins, while smooth ER synthesizes lipids.
  • Golgi Apparatus: modifies, sorts, and packages proteins and lipids for secretion.
  • Lysosomes: digests waste materials and cellular debris.
  • Ribosomes: site of protein synthesis.
  • Cytoplasm: a gel-like substance where organelles are suspended and many cellular processes occur.

Key Concept

  • Cells arise from pre-existing cells, refuting the earlier idea of spontaneous generation.

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