Cells

The smallest structural and functional unit of living things is a(n)

• atom
• organelle
• nucleus
• cell

Where do cells come from?

• organelles
• other cells
• animacules
• blood

The protective barrier surrounding the cell, which protects its contents from the cell's environment, is the

• cytoskeleton
• cell wall
• cell membrane
• central vacuole

Where is DNA stored in a eukaryotic cell?

• in the cytoplasm
• in the nucleus
• in the ribosome
• in the lysosome

The fluid inside every cell, and almost all of the cell's contents, is called the

• nucleus
• membrane
• organelles
• cytoplasm

According to cell theory,

• most organisms are made of cells.
• some cells are not in organisms.
• all organisms are made of one or more cells.
• only animals are made of cells.

A cell with a membrane-bound nucleus is

• unicellular
• multicellular
• prokaryotic
• eukaryotic

Organisms with DNA in a long, circular molecule are

• yeasts.
• ribosomes.
• eukaryotes.
• prokaryotes.