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CHARACTERISTICS OF CELLS

Javier Martelo

Created on September 2, 2021

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CHARACTERISTICS OF CELLS

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Mr. Javier Martelo

1. What is a Cell?

2. Why are most cells small?

3. The Cell Theory

index

4. What parts do all cells have in common?

5. Types of Cells

A. Prokaryotic Cells

B. Eukaryotic Cells

WHAT IS A CELL?

Like all living things, you are made of cells!!!

A CELL is the smallest functional and structural unit of all living organisms. An ORGANISM is any living thing. All organisms are made up of CELLS. Some organisms are just ONE CELL. Others, like humans, contain TRILLIONS OF CELLS.

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WHY ARE MOST CELL ARE SMALL?

Cells are small because their size is limited by their outer surface area.

The ratio of the cell's outer surface area to the cell's volume is called the SURFACE AREA-TO-VOLUME RATIO.

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index

the cell theory

The cell is the basic unit of all organisms

All organisms are made up of one or more cells

All cells come from existing cells

The Cell Theory is fundamental to the study of organisms, medicine, heredity, evolution, and all other aspects of life science.

the cell theory

1665

1673

1838

1839

1858

Robert Hooke sees tiny, box-like spaces when using a Microscope to observe thin slices of cork. He call these spaces CELLS.

Anton van Leeuwenhoek made careful drawings of the organisms he observed.

Matthias Schleiden concluded that plants are made of CELLS.

Theodor Schwann determined that all animal tissues are made of CELLS. He concluded that all organisms are made up of one or more CELLS.

Rudolf Virchow proposed that cells could form only from the division of other cells.

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TYPES OF CELLS

PROKARYOTIC (proh.KAIR.ee.oht)

EUKARYOTIC (yoo.KAIR.ee.oht)

Is a single-celled organism that does not have a nucleus or membrane-bounded-organelles. Its DNA is located in the Cytoplasm. Bacteria and Archaea are Prokaryotes (smaller that Eukaryotes).

Is an organism made up of cells that contain their DNA in a nucleus. Eukaryotic cells contain membrane-bounded organelles, as well as ribosomes. Most are multicellular but there are some unicellular organisms.