9.1 Quick Check

Cell theory is a fundamental concept in biology that states: 1) All living things are made of cells, 2) Cells are the basic unit of life, and 3) All cells come from pre-existing cells.

All cells come from pre-existing cells.

One function of cells related to energy is nutrition.

Anton van Leeuwenhoek improved microscope technology and was the first to observe living cells.

Matthias Schleiden discovered that plants are made of cells.

Theodor Schwann found that all animals are made of cells.

The basic unit of life is the cell.

The two main types of cells are prokaryotic cells and eukaryotic cells.

A prokaryotic cell is a simple, single-celled organism that lacks a nucleus and membrane-bound organelles.

A eukaryotic cell is a complex cell that has a nucleus and membrane-bound organelles.