The correct answer is D. Cells don’t disassemble and then reassemble themselves to move, but they do employ all of the other methods.

The correct answer is A. Humans are made up of trillions of cells, but there are only about 200 major cell types.

The correct answer is C. An egg cell has a larger diameter than any other type of human cell, about 80 micrometers. That’s roughly the same diameter as a strand of hair. However, nerve cells are our longest cells; some extend over 3 feet!

The correct answer is A. Every animal and plant cell has a nucleus, a membrane-bound chamber that holds its DNA. Cells that have a nucleus are called eukaryotes. Those that don’t, such as bacterial cells, are known as prokaryotes.

The correct answer is B, ribosomes. Mitochondria produce energy. The ER processes newly made proteins and produces fatty substances called lipids. And the Golgi complex receives products from the ER and packages them for delivery to other parts of the cell or body.

The correct answer is C. Most cells are colorless and see-through. However, iron-rich cells, which include some of our blood cells, are red. Since most cells are see-through, scientists use fluorescent tags and other chemicals to visualize structures inside those cells.