Semester Exam Flashcards
Homeostasis
Maintaining a stable internal environment.
The work of scientists begins with…
careful observations
Controlled Experiment
One variable is changed at a time.
How does science differ from other disciplines?
Can be tested and proved. Science relies strictly on facts.
When is a hypothesis useful?
When it is testable.
Where may a hypothesis come from?
Prior knowledge, observations, etc.
Spontaneous Generation
The idea that life could arise from nonliving matter.
What is not a goal of science or how science works?
Something that can’t be proven.
Inference
Logical interpretation of data based on prior knowledge.
Why do scientists need to publish the details of important work?
So their work can be replicated and further tested.
What is a tissue composed of?
individual or similar cells
Theory
well-supported hypothesis
Osmosis
Diffusion of water through a selectively-permeable membrane like the cell membrane.
Biology
study of life
Ribosomes
Small particles of RNA and protein found throughout the cytoplasm. Proteins are assembled here.
Chromosomes
Thread-like structures contain the genetic information that is passed from one generation of the cells to the next. Characteristics of the cell. Found in the nucleus.
Cell Wall
Strong layer around the cell membrane that protects the cell.
Cell Membrane
The gatekeeper to the cell. Thin, flexible membrane that surrounds the cell.
Characteristics of living things are?
Made of cells, grow and develop, based on universal genetic code, obtain materials and energy, reproduce, respond to their environment, and maintain a stable internal environment.