| A | B |
|---|
| species | a group of organisms that have the same characteristics and are able to produce offspring that can reproduce |
| compound microscope | microscope having more than one lens |
| Hans Janssen and his son Zacharias | invented the first compound microscope |
| Robert Hooke | Looked at a slice of cork and saw "boxes" he called "cells" |
| cell theory | theory stating that the cell is the basic unit of all living organisms, and only living cells can produce new living cells |
| nucleus | part of the cell that controls activities of other cell parts |
| chromosome | stringlike structure in a cell nucleus that carries information controlling all the cell's activities |
| cell membrane | thin outer covering that holds a cell together |
| cytoplasm | clear, jellylike material that fills the space between the cell membrane and the nucleus |
| organelle | tiny structure in the cytoplasm of a cell that performs a special job |
| mitochondria | organelles where food and oxygen react to release energy |
| vacuole | saclike organelle used for storing materials |
| endoplasmic reticulum | organelle that transports materials inside the cell |
| ribosome | organelle that puts together proteins for the cell |
| chloroplast | organelle that makes sugars, using carbon dioxide, water, and the energy from sunlight |
| chlorophyll | green substance in the chloroplasts that traps energy from sunlight |
| cell wall | tough, nonliving material that acts like an outside skeleton for each plant cell |
| photosynthesis | process of a plant using sunlight, carbon dioxide, and water to make its own food |
