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HMS Science Mid-Term
HMS 6th grade Science Mid-term key terms January 2011
| Question | Answer |
|---|---|
| Dust Bowl | the name given to the U.S. plains in the 1930s during a severe drought, caused by many conditions including poor farming practices |
| properties | the characteristics of an element, such as the physical qualities (color, hardness, crystal shape) |
| Mohs Hardness Scale | • rates hardness • talc (1) to diamond (10) • objects with higher rating can scratch objects with lower ratings |
| minerals | naturally occurring, crystalline, non-living solid material with specific properties |
| transparent | the ability to transmit light clearly so that an object can be seen through it |
| quantitative | measured by the quantity of something |
| Milliliters (mL) | common unit for measuring volume |
| control | none of the objects in the experiment are changed – used to compare |
| cell theory | the idea that cells are the building blocks that make up all living things |
| white blood cell | Cells in the immune system that fight foreign substances and disease |
| red blood cell | Cells that transport oxygen and carbon dioxide; Does not have a nucleus |
| tradeoff | getting rid of one thing in place for another, for balance |
| immune system | The system that defends the body against foreign substances from the outside |
| germ theory of disease | the idea that microbes (“germs”) can cause infectious disease and are easily spread by people |
| quarantine | to keep a sick person away from others in order to prevent the spreading of a disease |
| antibiotic | medicine (such as penicillin) that prevents the growth of or destroys certain microbes (anti-life) |
| cell membrane | • Acts as a barrier • controls what enters and leaves the cell |
| Alexander Fleming | discovered that penicillin could destroy the cell wall of bacteria, without damaging human blood cells |
| vector | an organism (not a person) that spreads disease-causing germs usually without getting sick itself |
| epidemiologist | scientists who trace the spread of a disease through a population |
| protist | a one-celled microbe that HAS a nucleus |
| virus | a non-living particle that causes a disease; does NOT have a nucleus |
| bacteria | A type of single cell organism that has a cell wall but does NOT have a nucleus or organelles |
| cytoplasm | material inside the cell that breaks down food |
| nucleus | central part of a cell that directs cell's activity and holds genetic information |
| nuclear membrane | separates the nucleus from the rest of the cell |
Created by:
reneewrob
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