CellsCellsSection 1 – Cell Section 1 – Cell

StructureStructureA.A. Common cell structures – outer covering Common cell structures – outer covering

called cell membrane and internal called cell membrane and internal gelatin like cytoplasm.gelatin like cytoplasm.

A.A. Comparing cells – size and shape relate to Comparing cells – size and shape relate to functionfunction

B.B. Two cell typesTwo cell typesA.A. Prokaryotic cells lack membrane – bound internal Prokaryotic cells lack membrane – bound internal

structures structures A.A. Only found in one-celled organisms such as bacteriaOnly found in one-celled organisms such as bacteria

B.B. Eukaryotic cells contain membrane – bound Eukaryotic cells contain membrane – bound internal structures. internal structures.

Cell organizationCell organization

B.B. Cell organizationCell organization

A.A. Composes of cellulose, a cell wall grows, Composes of cellulose, a cell wall grows, gives shape to, and protects the cells of gives shape to, and protects the cells of plants, algae, fungi, and most bacteria.plants, algae, fungi, and most bacteria.

B.B. Cell membrane – protective layer around Cell membrane – protective layer around the cells the cells

A.A. For cells with cell walls, the cell For cells with cell walls, the cell membrane is inside the cell wall.membrane is inside the cell wall.

B.B. A cell membrane allows food and oxygen A cell membrane allows food and oxygen into the cell and waste products out of into the cell and waste products out of the cellthe cell

Cytoplasm – gelatin like substance Cytoplasm – gelatin like substance inside cell membrane inside cell membrane Cytoskeleton – scaffolding – like Cytoskeleton – scaffolding – like

structure in cytoplasm which helps cell structure in cytoplasm which helps cell keep its shapekeep its shape

In the cytoplasm, eukaryotic cells have In the cytoplasm, eukaryotic cells have organelles which help cell life organelles which help cell life processes.processes.

Nucleus – contains instructions for Nucleus – contains instructions for everything cell does; includes DNAeverything cell does; includes DNA