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cells/ cell theory
7th grade science
| Question | Answer |
|---|---|
| what is the cell theory? | all organisms are made of cells. |
| in the 1830's MATTHIAS SCHLEIDEN studied plants what did he conclude? | all plants are made of cells. |
| around the same time a man named THEODOR SCHWANN did the same with animals what did he conclude? | all animals are made up of cells. |
| several years later, a man named RUDOLF VIRCHOW studied cells what did he conclude? | that cells divide to form new cells. |
| in the late 1500's the first microscope was created by putting 2 eye glass lenses in a tube. who was this? | a dutchman |
| in the mid-1600's the first real microscope was created. who created it and what was the magnification? | ANTONIE VAN LEEUWENHOOKE, 270x |
| how many lenses does a simple microscope have? | 1 |
| how many lenses does a compound microscope have? | multiple |
| how does a electron microscopes work? | no lenses but a magnetic field in a vacuum. can magnify up to 1,000,000x. |
| what is magnification? | the product of the eye piece and the objective lens. |
| in 1665 ROBERT HOOKE sliced a piece of cork and saw it was full of little, empty boxes. what did he name it? | "cells" |
| what is the cell membrane? | the outer covering made up of 1 or more layers of several linked molecules. |
| what is cytoplasm? | inside every cell is a gelatin like substance. |
| what are prokaryotic cells? | cells without a cellular bound structure (no cell membrane). |
| what are eukaryotic cells? | cells with a cellular bound structure (cell membrane). |
| what is the cell wall? | the ridged outer covering of a plant cell. |
| what is in the cell wall? | pectin, cellulose, lignin. |
| what are organelles? | cellular structures. |
| what is the cytoskeleton? | protein fibers that allow the cell to move and keep its shape. |
| what is the nucleus? | the brain of the cell. |
| what is deoxyribonucleic acid? | long threadlike material that contains instructions for everything the cell does. |
| what are chromosomes? | tight coils of hereditary material around proteins. |
| what is the nucleolus? | structure in the nucleus where proteins are assembled. |
| what are chloroplasts? | green organelles. |
| what is chlorophyll? | a green pigment found in chloroplasts that creates sugar from sunlight. |
| what is glucose? | the sugar made from sunlight. |
| what is the mitochondria? | the power house of the cell. |
| what are manufacturing organelles? | proteins that are used in almost all cellular activity. |
| what are the endoplasmic reticulum's? | a series of folded membranes. s.e.r.: no attached ribosomes. R.E.R.: have attached ribosomes. |
| what are ribosomes? | small structures that are made in the nucleus and move to the cytoplasm. |
| what are Golgi bodies? | stacked flat membranes that sort proteins and other substances. |
| what are vacuoles? | storage place for the cell. |
| what are lysosomes? | produce chemicals that break down food molecules, waste, and worn out cell parts. |
| what is tissue? | a group of cells that do one job. |
| what is an organ? | a group of tissues that work together. |
| what is an organ system? | a group of organs working together. |
Created by:
abbyhowe1234
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