Outcome B Flashcards
DNA
Genetic code that stores the complex information organisms need to live, grow, and reproduce
Biology
Study of life
Stimulus
Signal to which an organism responds
Sexual reproduction
Cells from two parents unite to form the first cell of a new organism
Asexual reproduction
A single organism produces off springs identical to itself
Homeostasis
When organisms keep their internal environment relatively stable
Metabolism
When chemical reactions through which an organism builds up or breaks down materials
Biosphere
The connection of all forms of life on Earth
Cells
Basic units of life
What is the cell theory?
- all living organisms are made up of one or more cells
- cells are the basic units of structure and function in living things
- new cells are produced from existing cells
Cell membrane
A thin, flexible barrier of a cell
Nucleus
A large membrane-enclosed structure that contains genetic material and controls many of the cells activities
Eukaryotes
Cells that enclose their DNA in nuclei
Prokaryotes
Cells that do not enclose DNA in nuclei
Tissue
Group of similar cells that perform a particular function
Organ
Group of tissues that work together
Organ system
Group of organs that work together to perform a particular function
Receptor
Responds to chemical signals
What are the characteristics of living things?
- made up of cells
- based on DNA
- obtain and use materials and energy
- grow and develop
- reproduce
- respond to the environment
- homeostasis
- evolve
Electron Microscope
- uses electron beams to focus and magnify a non-living image
- better magnification
Scanning Electron Microscope
- magnifies up to 500,000 times
- can show things in 3D
Transmission Electron Microscope
- magnifies up to 1,000,000 times
- makes small, 2D pictures
Compound Light Microscope
- allows light to pas through the specimen
- uses 2 lenses to form an image
- limited by the nature of light
