Biology Quarter 1: Homeostasis and Cell Theory
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Questions and Answers

What is homeostasis?

Maintenance of an internal balance needed for survival

What is an example of homeostasis?

Cells are the Basic Unit of Life

What are the three principles of the cell theory?

All organisms are made of cells, all existing cells are produced by other living cells, and the cell is the most basic unit of life.

Which of the following are characteristics all cells share?

<p>Are filled with cytoplasm</p> Signup and view all the answers

Eukaryotic cells do not have a nucleus.

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

What organelle supplies energy to the cell?

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

What is the function of lysosomes?

<p>Contain enzymes to digest material</p> Signup and view all the answers

The ____ is the rigid structure outside the plasma membrane in plant cells.

<p>cell wall</p> Signup and view all the answers

Match the following organelles with their primary functions:

<p>Ribosomes = Create proteins Golgi Body = Process and package materials Mitochondria = Break down sugar to release energy Lysosomes = Detoxify waste material</p> Signup and view all the answers

Study Notes

Homeostasis

  • Homeostasis refers to the maintenance of an internal balance essential for survival.
  • An example of homeostasis is the regulation of cellular conditions.

Cell Theory

  • The cell theory was developed from the contributions of many scientists and advancements in microscopy.
  • It includes three main principles:
    • All organisms are composed of cells.
    • All existing cells arise from pre-existing living cells.
    • The cell is the most fundamental unit of life.

Characteristics of Cells

  • All cells share certain characteristics:
    • Contain DNA.
    • Enclosed by a cell membrane.
    • Filled with cytoplasm.

Types of Cells

  • Two main types of cells exist: eukaryotic and prokaryotic.
    • Eukaryotic Cells:
      • Have a nucleus.
      • Contain membrane-bound organelles.
    • Prokaryotic Cells:
      • Lack a nucleus.
      • Do not have membrane-bound organelles.

Eukaryotic Cell Structure

  • Eukaryotic cells possess an internal structure, including:
    • Nucleus: Stores genetic information.
    • Endoplasmic Reticulum (ER): Involved in various processes; consists of:
      • Rough ER: Studded with ribosomes, synthesizes proteins.
      • Smooth ER: Lacks ribosomes, involved in lipid synthesis.
    • Ribosomes: Link amino acids to form proteins.
    • Mitochondria: Generate energy by breaking down sugars and producing ATP.
    • Vacuoles: Fluid-filled sacs for storage of materials.
    • Lysosomes: Contain enzymes to digest and detoxify waste material.

Organelles Functions

  • Golgi Body: Processes and packages materials into vesicles for transport.
  • Cytoplasm: Gel-like substance where cellular processes occur.
  • Cell Membrane: Regulates what enters and leaves the cell.
  • Cell Wall (in plants): Rigid structure providing support and protection.

Importance of Microscopy

  • Improvements in microscopy allowed for the discovery and understanding of cell structures and functions.

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Description

Explore the crucial concepts of homeostasis and the foundational principles of cell theory in this quarter 1 quiz. Understand how these concepts contribute to the maintenance of life and the understanding of biological organisms. Perfect for students looking to review key topics in biology.

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