| A | B |
|---|
| Cells are | basic units of structure and function in living things |
| The invention of the microscope | enabled people to discover to learn about cells |
| The cell theory states that the following: | All living things are composed of cells. |
| All cells are produced from | other cells. |
| The lenses in the microscope magnify an object bys | bending the light that passes through them |
| Electron microscopes use a | beam of electrons instead of light to produce a magnified image |
| A plant's cell wall | protects and supports the cell |
| The cell membrane | controls what substances come into and out of a cell |
| The nucleus | directs the cell activities - is the brain |
| Mitochondria | convert energy in food molecules to energy the cell can use |
| The endoplasmic reticulum | carries materials throughout the cell |
| Ribosomes | produce proteins |
| The Golgi bodies | receive materials, package them and distribute them |
| Chloroplasts | capture energy from sunlight and use it to produce food for the cell |
| Vacuoles are | the storage areas of cells |
| Lysosomes contain | chemicals that break down certain materials in the cell |
| In many-celled organisms | cells are often organized into tissues, organs, and organ systems |
| A bacterial cell has | a cell wall and cell membrane, but no nucleus |
| Genetic material is found in the | cytoplasm |
| An element is | any substance that cannot be broken down into simpler substances |
| When two or more elements combine chemically | they form a compound |
| Important groups of organic compounds found in living things are | carbohydrates, proteins, lipids, and nucleic acids |
| Without water | most chemical reactions within cells could not take place |
| Diffusion is the | main method by which small molecules move across the cell membrane |
| Osmosis is important to cells because | cells cannot function properly without adequate water |
| Active transport | requires the cells to use energy |
| Passive transport | does not require energy |
