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21 Cards in this Set
- Front
- Back
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What is the major water pollution problem that has been of concern in the eastern United States?
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The major concern is nonpoint source nitrogen in rivers. Numerous
rivers and major bodies of water have been plagued by high amounts of nitrogen. |
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Where does some of the nitrogen polluting the waterways come from?
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Crop fields and grazing lands.
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Why does nitrogen pollution in water occur?
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Rainfall dissolves and leaches nitrogen and other nutrients from soil into nearby streams and rivers that eventually feed coastal bodies of water.
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Why do important fish and shellfish die?
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Nitrogen causes flora and microbes to grow. This lowers the amount of dissolved oxygen in water. Since there's not much oxygen, fish die.
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What is denitrification?
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Denitrification is the process of nitrate being changed by bacteria to gaseous nitrogen.
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Why are wetlands important?
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They are a good complement to water quality improvement practices. They are pretty inexpensive to build. They're simple to operate, pleasing, and are home for a lot of wildlife.
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Who was the Dutch man who worked with small lenses and fashioned a small microscope?
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Anton Von Leeuwenhoek
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Anton Von Leeuwenhoek is known as the father of....
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Microbiology
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Who was the British scientist who used a compound microscope, and observed a thin slice of cork? He coined the term "cell".
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Robert Hooke
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Who were the two scientists who together concluded that all living things are made of cells?
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Mathias Schleiden and Teodor Schwann
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Who was the German pathologist who said that cells come from other cells?
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Rudoph Virchow
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What does acellular mean?
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A cell has a lot of the properties of a living thing, but it's not a cell.
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What does the modern cell theory state? (3 statements)
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The cell is:
-the unit of structure -the unit of function -cells come from other cells |
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Define a prokaryotic cell.
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A prokaryotic cell is one that:
-is typical of bacteria -has no membrane bound nucleus(nucloid) |
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Define a eukaryotic cell.
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A eukaryotic cell is one that:
-has a normal nucleus in the center -consists of organelles in the cytoplasm -has a cell/plasma membrane -between nuclear and plasma membranes |
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A cell/plasma membrane is(4 statements):
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-bilayered
-semipermeable -made up of phospholipids -fluid mosaic |
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What is chromatin?
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The form that DNA is stored in except for when the cell is dividing. It's a chromosome with a different packing structure.
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The cell membrane is different from the nuclear membrane in that....
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The cell membrane only has 1 2-ply bilayer, whereas the nuclear membrane has a 4-ply layer.
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What is the organelle that is the site of protein building?
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The ribosome.
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What is the role of the nucleolus?
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To build ribosomes, and process RNA messages off of DNA. The nucleolus creates a copy of DNA and revises it.
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What are the properties of the nucleolus?
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-composed of ribosomal RNA
-forms subunits of ribosomes |
