Cell Structure October 23, 2012. Common Cell Structures Outer covering called cell membrane and internal gelatinlike cytoplasm 1. comparing cells- size.

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Presentation transcript:

Cell Structure October 23, 2012

Common Cell Structures Outer covering called cell membrane and internal gelatinlike cytoplasm 1. comparing cells- size and shape relate to function 2. Two cell types – Prokaryotic cells lack membrane-bound internal structures – Eukaryotic cells contain membrane-bound internal structures

Prokaryotic Cell vs. Eukaryotic Cell

Cell Organization 1. Composed of cellulose, a cell wall grows, gives shape to, and protects the cells of plants, algae, fungi, and most bacteria 2. Cell membrane-protective layer around all cells – A. For cells with cell walls, the cell membrane is inside the cell wall – B. A cell membrane allows food and oxygen into the cell and waste products out of the cell

Cell wall and cell membrane

Cell Organization 3. Cytoplasm-gelatinlike substance inside cell membrane – A. Cytoskeleton- scaffolding-like structure in cytoplasm which helps cell keep its shape – B. In the cytoplasm, eukaryotic cells have organelles which help with cell life processes. 4. Nucleus-contains instructions for everything cell does; includes DNA

Nucleus

Cell Organization 5. Energy-processing organelles-help cells do their work – A. Green organelles in plant cells contain chloroplasts to make food. – B. Organelles which release energy from food are called mitochondria

Chloroplast and Mitochondria

Cell Organization 6. Manufacturing Organelles – A. Ribosomes make proteins for cell activities – B. Some ribosomes attach to the rough part of the endoplasmic reticulum, a series of smooth or rough membranes that move materials around in a cell

Endoplasmic Reticulum

Cell Organization 7. Transporting and storing organelles – A. Golgi bodies move substances out of a cell or to other parts of a cell – B. Vacuoles-membrane-bound temporary storage spaces

Golgi Apparatus and Vacuoles

Cell Organization 8. Recycling organelles- lysosomes break down food molecules and cell wastes

From cell to organism 1. Tissue- group of similar cells working together on one job 2. Different types of tissues working together make up an organ 3. A group of organs working together on a particular function form a(n) organ system

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