Cell Structure Section 1

Section 1: Introduction to Cells

Preview• Bellringer• Key Ideas• The Discovery of Cells• Looking at Cells• Cell Features• Summary

Cell Structure Section 1

Bellringer

After viewing the list of items on the board, work with a partner and make two new lists: those items on the list comprised of cells and those items not comprised of cells.

Give a rationale for each answer.

Cell Structure Section 1

Key Ideas

• How were cells discovered?

• Why does cell shape vary?

• What enables eukaryotes to perform more specialized functions than prokaryotes?

Cell Structure Section 1

The Discovery of Cells

• ALL living things are made of cells

– Cell Theory

Cell Structure Section 1

Visual Concept: Cell Theory

Cell Structure Section 1

Looking at Cells, continued

• All substances that enter or leave a cell must cross the surface of the cell.

• Bigger surface area = better exchange

Cell Structure Section 1

Cell Features

• All cells have a cell membrane, cytoplasm, ribosomes, and DNA.

• The cell membrane is the outer layer that covers a cell’s surface

• The cytoplasm is the region of the cell within the cell membrane, made of a fluid called the cytosol.

Cell Structure Section 1

Features of Prokaryotic and Eukaryotic Cells

Cell Structure Section 1

Cell Features, continued

Prokaryotic Cells

• A prokaryote is an organism made of a single prokaryotic cell.

• Prokaryotic cells do not have a nucleus.

• For millions of years, prokaryotes were the only organisms on Earth.

Cell Structure Section 1

Cell Features, continued

Features of Eukaryotic Cells

• A eukaryote is an organism made up of one or more eukaryotic cells.

• The DNA of a eukaryotic cell is found in the nucleus.

Cell Structure Section 1

Visual Concept: Comparing Prokaryotes and Eukaryotes

Cell Structure Section 1

Comparing Prokaryotes and Eukaryotes