Advertisement Upgrade to remove ads

selective permeability

a property of biological membranes that allow some substances to pass through while keeping others out

phospholipid bilayer

a double layer of phospholipids that makes up plasma and organelle membranes

transport protein

a protein located in the cell membrane that helps move specific substances in and out of the cell

fluid mosaic model

structural model of the plasma membrane where molecules are free to move sideways within a lipid bilayer


a jellylike fluid inside the cell in which the organelles are suspended


a network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement


An organelle that functions in the synthesis of proteins


structure inside the nucleus, where ribosomes are made

endoplasmic reticulum

a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids

Golgi apparatus

stack of membranes in the cell that modifies, sorts, and packages proteins from the endoplasmic reticulum into sacs called vesicles


storage structures for food, water, minerals, waste


the organelle that digests food particles, wastes, cell parts, and foreign invaders


specialized organelle that directs cell division in animal cells


An organelle that carries out cellular respiration, which produces the energy a cell needs to carry out its activities


organelle found in cells of plants and some other organisms that carries out photosynthesis, which captures the energy from sunlight and converts it into chemical energy

cell wall

a rigid layer of nonliving material that surrounds the cells of plants and some other organisms and gives them support


a short, hairlike projection from the surface of a cell


a long, hairlike structure that grows out of a cell and enables the cell to move

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording