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