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39 Cards in this Set
- Front
- Back
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organism
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living thing
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cell
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basic unit of structure and function in the organism
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unicellular
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made up of one cell ( bacteria)
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Multicellular
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made up of many cells (animals, plants)
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in multicellular organizms, what do cells do?
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cells have specific jobs
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Can human cells duplicate?
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all human cells can duplicate, except for brain cells
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All living things ________, ______,________,_______,_,_,
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have cellular organization
contain similar chemicals use energy respond to surroundings grow and develope can reproduce |
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what do you need to see cells?
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a microscope
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the cells of living things are composed of
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chemicals:
water, carbohydrates, protiens lipids, nucleic acid |
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carbohydrates
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are a cell's main energy source
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protiens and lipids
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are the building blocks of cells
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nucleic acid
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genetic material or chemical instructions
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Energy Use
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cells in multicellular and unicellular organizims are always working to keep the organism alive
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response to surroundings
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organisms react to change in their enviornment
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stimulus
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changes in temperature, light, sound, and other factors that make an organism react
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response
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an action or change in behavior (how an organism reacts to a stimulus)
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Growth
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the process of becoming larger
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Developement
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process of change that occurs in an organism's life that produces a more complex organism
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what do organisms do to grow and develope
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use energy to create new cells
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reproduce
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produce offspring that are similar to the parents
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What do living things come from?
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living things
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spontaneous generation
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beleif (400 years ago) that life can arise from non living matter
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controlled experiment
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an experiment in which a scientist carries out two tests that are identical exept for one variable
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manipulated variable
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the one factor the scientist changes
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Redi's experiment
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meat in jars, one covered, one not, flies came, layed eggs on meat (uncovered) and maggots arose, but couldn't get into covered meat, so there were no maggots
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When was Redi's experiment?
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1600s, in Italy
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What did his experiment prove?
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it disproved spontaneous generation
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Did Redi's experiment convince?
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no
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Pasteur's experiment
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put broth in containers where bacteria couldn't get in, boiled one broth so no bacteria, didn't boil other, three days unbloiled cloudy w/bacteria, boiled not cloudy for year until container opened
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When was Pasteur's experiment?
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mid-1800s, france
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What did Pasteur's experiment prove?
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It disproved spontaneous generation-life comes from life
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Did Pasteur's experiment convince?
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Yes
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needs of living things
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food, water,living space, stable internal conditions
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autotrophs
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orgainsms that can make their own food ( plants)
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heterotrophs
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organisms that feed on other organisms (t-rex)
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what do organisms need most of all?
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Water
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why do they need water?
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dissolves chemicals, food that cells need disolves, watery enviornment for dissolving
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What is living space?
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a place for an organism to get food, water, and find shelter
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homeostasis
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the mantienence of stable internal conditions
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