Science Chapter 1 Section 4
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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| compound light microscope | Consists of a tube with lenses, a stage, and a light source- it magnifies the image, common in science classrooms. Range of magnification @ 40x -400x. Review parts and functions.
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| electron microscope | Tiny particles of matter are used to magnify images. NEVER LIVE SPECIMENS
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| transmission electron microscope (TEM) | Electrons pass through the specimen and produce a flat image-can magnify up to 200,000 times the actual size. (No live specimens)
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| scanning electron microscope (SEM) | Electrons bounce off the surface of the specimen and a three-dimensional (3-D) image is produced-can magnify up to 100,000 times the actual size. (No live specimens)
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| X-rays | Used for almost a century to see internal structures of organisms (bones, heart, lungs) and the structures of proteins (DNA).
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| CT scans(computerized tomography) | Low dosage x-ray beams are passed through the body at different angles, and often a dye is injected to help highlight tissues-provides a clearer, more detailed image than x-rays-useful for studying brain and spinal tissue. Fast results less expensive.
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| MRI(magnetic resonance imaging) | Provides a clearer image than x-rays by using short bursts of magnetic field -useful for studying brain and spinal tissue. Takes 25-60 minutes to get results. Uses a computer to display
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| Computers | Can collect, store, organize, and analyze information-can create graphs, solve math problems, and analyze data. With the help computers, life scientists are able to solve problems that they were not able to solve in the past.
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| Be sure to review | your class notes.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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