SCS 7th Grade Science-Section 1 What is Life?
|organisms||Any living thing|
|cell||The smallest/basic unit of structure and function within an organism.|
|microscope||A tool that uses lenses to magnify small objects|
|Unicellular|| "uni" means one or single. |
A single-celled organism
|Multicellular|| "Multi" means many.|
Organisms composed of many different cells.
Example - A human body
|water||The most abundant chemical in cells|
|carbohydrates||A cell's main source of energy|
|proteins and lipids||The building materials of cells|
|nucleic acids||Genetic material that gives chemical instructions about how each cell should function.|
|stimulus (stimuli)|| A change in an organism's surroundings that cause it to react. Something that causes a cell to react|
Example- loud noise, light, explosion, roller coasters.
|response||An action or change in behavior based on a stimulus. Example- You experience fear and scream when someone jumps out at you.|
|development||The process of change that occurs during an organism's life to produce a more complex organism.|
|reproduction||The ability to produce offspring that are similar to the parents|
|spontaneous generation||The incorrect idea that living things can be produced from nonliving sources.|
|controlled experiment||an experiment in which a scientist carries out tests changing only one variable at a time|
|autotroph|| "auto"-means self "troph"-means feeder|
organisms that make their own food in orderto cary out their cell's functions. Example- plants
|heterotroph|| "hetero" -means other "troph"- means feeder|
organisms that get their energy from eating food produced by other sources. Example humans and animals.
|living space||a place/space where an organism gets food water and shelter in order to survive.|
|homeostasis||maintaining or keeping a stable internal condition within a cell so that it can survive and be healthy|
|Louis Pasteur||Scientist of the 1800's that proved that proved spontaneous generation was false. He experimented with mold growing on beef broth.|
|Francesco Redi||Scientist of the 1600's that proved spontaneous generation was false. He experimented with maggots growing on raw meat.|