Cellular Basics

Prokaryotic and Eukaryotic Cells

How big are animal cells?

Most animal cells are very small, and most cannot be seen without a microscope; in fact, most cells are smaller than the period at the end of this sentence. Two exceptions are bird and frog egg cells—both are larger cells readily observable with the unaided eye. For example, the chicken egg is actually one single cell—the nucleus, cytoplasm, and cellular membrane, which contains an abundance of yolk and albumin—the nutrients needed for the developing chick (embryo)—making this cell much larger than the normally functioning cells within the chicken.


This is a web preview of the "The Handy Biology Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App