Comparing Plant and Animal Cells Mrs. Hennessey

What is a cell? definition: a small compartment that holds all of the biological equipment necessary to keep an organism alive Basically, cells are the building blocks of life. They come in many different shapes and sizes and perform a variety of functions.

Basically, cells are the building blocks of life. They come in many different shapes and sizes They perform a variety of functions.

About cells… Their main purpose is to organize. They make up all living things. Some organisms are unicellular, such as the amoeba, while others are multicellular, such as humans. Although cells appear to be very different, they actually have a lot in common. Cells are alive!

Animal Cell What is it? makes up many tissues in animals many types (cheek, nerve, muscle)

Plant Cell What is it? a structural and functional unit of a plant different plant cells have different roles

Plant Cells vs Animal Cells: Similarities Both animal and plant cells have cell membranes that enclose the cell. Both are filled with cytoplasm, a gel-like substance containing chemicals needed by the cell. Both have a nucleus where DNA is stored. Both have ribosomes, protein builders of cells.

Similarities Continued Both plant and animal cells have mitochondria that use oxygen to break down food and release energy. Both kinds of cells have vacuoles that contain food, water, or waste products. (Animal cells usually have many more vacuoles than plant cells do.)

A Few More Similarities Both have endoplasmic reticulum, where a system of tubes transports proteins. Both have Golgi bodies to distribute proteins outside of the cell.

Plant and Animal Cells: Differences Plant cells have cell walls that provide structure. Animal cells do not have cell walls. A few large animal cells have more than one nucleus, but plant cells ALWAYS have just one. Plant cells have chloroplasts for photosynthesis. Animal cells do not.

More Differences: Animal cells use mitochondria for energy production. Plants primarily use chloroplasts to produce energy. Animal cells tend to have many small vacuoles. Mature plant cells may have only one large vacuole. Animals cells have lysosomes, but plant cells do not.

Activity Use a Venn Diagram to compare the animal cell to the plant cell.

rough and smooth endoplasmic reticulum flagella only in gametes Compare and Contrast Both Plant Animal mitochondria cell wall no cell wall Golgi apparatus large vacuole small or no vacuole rough and smooth endoplasmic reticulum Plant and animal cells contain nearly all the same structural components. chloroplasts no chloroplasts nucleus flagella only in gametes cytoplasm flagella ribosomes

Cells & Energy Cells get energy originally from the sun. In plant cells, chloroplasts trap light energy and change it into chemical energy.

Cells & Energy (continued!) Chemical bonds hold two or more atoms together to form molecules of sugar. Both plant and animal cells break down these molecules by breaking the chemical bond. When the bonds are broken, energy is released. Cells can either use the energy or store it. Mitochondria in plant and animal cells use oxygen to release this energy.

Cells Using Information The nucleus is the control center of plant and animal cells. The nucleus contains DNA. DNA and RNA molecules work together to make proteins. Cells require thousands of protein molecules in order to work well.

More DNA DNA in a cell’s nucleus determines what kind of cell it it. DNA has instructions for all of the cell’s activities. DNA doubles when a cell divides.