Science unit cells review

What are the three postulates of the cell theory?

1) All living organisms are composed of one or more cells. 2) The cell is the basic unit of life. 3) All cells arise from pre-existing cells.

What is a cell?

A cell is the smallest unit of life that can function independently and perform all necessary life processes.

What are the structures and organelles found in a plant cell?

1) Cell wall - provides structure and support. 2) Chloroplasts - conduct photosynthesis. 3) Vacuole - stores nutrients and waste products. 4) Nucleus - contains genetic material. 5) Mitochondria - produces energy.

What are the structures and organelles found in an animal cell?

1) Cell membrane - protects the cell and controls what enters/exits. 2) Nucleus - contains genetic material. 3) Mitochondria - produces energy. 4) Ribosomes - synthesize proteins. 5) Endoplasmic reticulum - processes and transports proteins.

How are plant and animal cells different?

Plant cells have a cell wall and chloroplasts

What do permeable

impermeable

What is the process of diffusion?

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. It plays a role in cells by allowing substances like oxygen and carbon dioxide to move in and out.

What is the process of osmosis?

Osmosis is the diffusion of water across a selectively permeable membrane. It helps maintain cell turgor and balance solute concentrations.

What are the five classifications of organisms?

1) Animals - multicellular and heterotrophic. 2) Plants - multicellular and autotrophic. 3) Fungi - decomposers and have cell walls. 4) Protists - mostly unicellular and diverse. 5) Bacteria - unicellular and prokaryotic.

What are the parts of a microscope and their functions?

1) Eyepiece - magnifies the image. 2) Objective lenses - provide different magnifications. 3) Stage - holds the slide. 4) Light source - illuminates the specimen. 5) Coarse adjustment knob - focuses the image.