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HMS Science Mid-Term

HMS 6th grade Science Mid-term key terms January 2011

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