Cells: Basic Unit of Life Overview
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Questions and Answers

What is the primary function of the nucleus in a cell?

The nucleus acts as the control center of the cell, housing DNA and coordinating cellular activities.

How do plant cells differ from animal cells?

Plant cells have a cell wall, chloroplasts, and a large vacuole, whereas animal cells do not have these structures.

What role do mitochondria play in a cell?

Mitochondria are known as the powerhouse of the cell, responsible for producing energy through aerobic respiration.

What is the significance of plasmids in bacterial cells?

<p>Plasmids are small, circular DNA molecules that allow bacteria to share genetic information, contributing to genetic diversity.</p> Signup and view all the answers

Describe the function of ribosomes in a cell.

<p>Ribosomes are the sites of protein synthesis, producing proteins that are essential for various cell functions.</p> Signup and view all the answers

What is the process of cell division?

<p>Cell division is a process where a single cell divides into two cells, which can further divide, leading to exponential growth.</p> Signup and view all the answers

What makes specialized cells different from regular cells?

<p>Specialized cells have unique structures and functions tailored to specific tasks, such as ciliated cells aiding in mucus movement.</p> Signup and view all the answers

What are the basic levels of organization in a multicellular organism?

<p>The basic levels of organization are cells, tissues, organs, and organ systems, culminating in a multicellular organism.</p> Signup and view all the answers

Flashcards

What is the function of the nucleus in a cell?

The control center of a cell, containing DNA and coordinating cell activities.

What is the role of mitochondria in a cell?

The powerhouse of the cell, responsible for producing energy through aerobic respiration.

What is the function of the cell membrane?

It regulates the movement of substances in and out of the cell, acting as the outer boundary.

What is cytoplasm and what happens in it?

A jelly-like substance that fills the cell and houses organelles. Chemical reactions take place here.

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What is the role of ribosomes in a cell?

They are sites of protein synthesis, producing proteins essential for cell function.

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What is the cell wall and what is it made of?

A strong, rigid outer layer made of cellulose that provides structural support, strength, and protection.

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What is the role of chloroplasts in a plant cell?

They contain chlorophyll, which is responsible for photosynthesis, converting light energy into food.

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What are ciliated cells and their function?

Specialised cells that line the trachea and bronchi, moving mucus to clear the airways.

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Study Notes

Cells: The Basic Unit of Life

  • A cell is the fundamental building block of life.
  • Cells are the basic components of complex organisms.

Animal Cell Structure

  • Nucleus: Control center, contains DNA, coordinates cell activities
  • Mitochondria: Powerhouse, responsible for aerobic respiration (energy production)
  • Cell Membrane: Regulates substance passage, acts as an outer boundary
  • Cytoplasm: Jelly-like substance, houses organelles, site of chemical reactions
  • Ribosomes: Synthesize proteins, essential for cell function

Plant Cell Structure

  • All animal cell structures are present in plant cells.
  • Unique plant cell structures:
    • Cell Wall: Cellulose, structural support, strength, and protection
    • Chloroplasts: Contain chlorophyll, perform photosynthesis (light energy to food)
    • Vacuole: Filled with cell sap, storage, supports cell shape

Bacterial Cell Structure

  • Similarities to Animal Cells: Contains cytoplasm, cell membrane, ribosomes
  • Differences from Animal and Plant Cells:
    • Circular DNA: Single, circular chromosome
    • Plasmids: Small, circular DNA molecules, exchanged between bacteria, allowing for genetic information sharing

Cell Division

  • New cells are created by existing cells dividing.
  • Process: A single cell divides into two, the two into four, and so on.

Organization of a Multicellular Organism

  • Cells: The most basic unit.
  • Tissues: Groups of similar cells working together.
  • Organs: Composed of different tissues working together for a specific task.
  • Organ Systems: Groups of organs working together for major body functions.
  • Multicellular Organisms: Formed by combination of all these levels.

Specialized Cells

  • Ciliated cells: Cilia (hair-like structures) move mucus in trachea and bronchi, clearing airways.
  • Root hair cells: Found in plant roots, increase water and mineral absorption.
  • Palisade mesophyll cells: Located in plant leaves, chloroplasts for photosynthesis.
  • Neurons: Nerve cells, transmit electrical impulses throughout the body.
  • Red blood cells: Hemoglobin, transport oxygen throughout the body.
  • Sperm and egg cells (gametes): Reproductive cells, combine to form an embryo.

Magnification

  • Magnification: Ratio of image size to actual object size.
  • Formula: Magnification = Image size / Actual size
  • Units: Must be consistent, typically millimeters.
  • Unit Conversions:
    • mm to µm: multiply by 1000
    • µm to mm: divide by 1000

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Description

Explore the fundamental structures of animal and plant cells in this quiz. Learn about the roles of the nucleus, mitochondria, chloroplasts, and more. Test your knowledge on cell components and their functions.

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