Exams Flashcards
homeostasis
makes internal conditions stable
the work of scientists begins with
careful observations
controlled experiment
an experiment in which one variable is changed
how does science differ from other subjects?
it relies strictly on facts
when is a hypothesis useful?
when it’s testable
where may a hypothesis come from?
observations, inferences, or prior, knowledge
spontaneous generation
the idea that life could arise from nonliving matter
what isn’t a goal of science?
something that cannot be proven
inference
a logical interpretation based on prior knowledge or experience
why do scientist need to publish the details of important work?
so that their work can be replicated by other scientist
a tissue is composed of what
similar and individual cells
theory
well tested explanation that unifies a broad range of observations
biology
study of life
osmosis
diffusion of water across a semipermeable membrane like the cell membrane
ribosomes
small particles in cell where proteins are assembled
chromosomes
thread like structures in nucleus that contain genetic information that is passed from generation to generation
cell wall
strong supportive layer around the cell that protects the cell
cell membrane
a thin flexible barrier around cell that regulates what enters and leaves
characteristics of living things
- made up of cells
- reproduce
- based on a universal genetic code
- grow and develop
- respond to environment
- maintain stable environment
- change over time
nucleus
control center of cell
brain of cell
Goal of science?
investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions.
