Biology Flashcards
Homeostasis
When an organism maintains a stable internal condition
The work of scientists begins with
Careful observations
Controlled experiment
The experiment when one variable is changed at a time
How does science differ from other disciplines
Relies strictly on facts
When is a hypothesis useful
It is useful if it’s testable
Where may a hypothesis come from
Observations, prior knowledge & inferences
Spontaneous generation
The idea that life can arise from nonliving things
What is not a goal of science or how science works
Something that can’t be proven
Inference
Logical interpretation based on prior knowledge
Why do scientists need to publish the details of important work
So other scientists can replicate there work
A tissue is composed of what
Similar cells
Theory
A well tested or supported hypothesis
Osmosis
Diffusion of water between a selectively permeable membrane
Biology
The study of life
Ribosomes
Small particles in the cell where proteins are assembled
Chromosomes
Thread like structure in the nucleus that contains genetic information that is passed on through generations
Cell wall
Strong, supportive layer around the cell that protects the cell
Cell membrane
Thin,flexible barrier around the cell that controls what enter & leaves the cell
Characteristics of living things
- made up of cells
- reproduce
- based on universal genetic code
- grow & develop
- obtain & use materials & energy
- respond to their environment
- maintain stable environment
- change overtime
Nucleus
Center of cell, brain of cell
Metabolism
Builds up or break down materials as it carries out its life function
Microscope
A tool that magnifies things that the human eye can’t see without help
Compound light microscope
When light passes through the specimen uses to lenses to form an image
Mitochondria
Powerhouse, gives cell energy
