Biology Flashcards
Simplified notes (38 cards)
What is biology?
Biology is the study of life and living things.
Define: Biologist
A scientist who studies biology.
Define: Organism
A living thing.
What is the life cycle?
The series of changes that an organism can go through. For many organisms, this involves growing, changing, reproducing, and dying.
What is biology called?
Biology is called a life science, or natural science, because it’s the study of life-forms in nature.
What do all organisms have in common?
All living things share the same characteristics of life:
-They are made up of One or more cells
-They need energy to live
-They respond to stimuli (they react to their environment)
Define: Cell
The basic unit of life.
Define: Stimulus
Anything that causes a response.
What is the Modern Cell Theory?
- The cell is the smallest living unit in all organisms.
- All living things are made of cells.
- All cells come from other pre-existing cells
What are unicellular organisms?
Organisms made up of just one cell.
What are multicellular organisms?
Complex organisms made up of many cells. They can usually be arranged into tissues, which can make up organs, which can make up organ systems.
Define: Unicellular
Made up of one cell.
Define: Multicellular
Made up of more than one cell.
What are life functions?
Processes that an organism takes on to help it survive. It includes: growth, reproduction, nutrition, respiration, transport, synthesis, excretion, and regulation.
Define: Offspring
A new organism created from parent organisms.
Define: Asexual reproduction
When one parent organism reproduces by itself.
Define: Sexual reproduction
When two parent organisms reproduce.
Define: Nutrients
Substances that provide nourishment essential for growth and the maintenance of life.
Define: Metabolism
The set of chemical reactions that maintain the life of an organism.
Define: Circulation
The movement of something through the body of an organism.
Define: Homeostasis
A state of steady internal physical and chemical conditions set by the body. It keeps an organism alive despite a changing environment.
Define: Adaption
A behavior or physical characteristic that allows an organism to survive or reproduce in its environment.
What is Classification Hierarchy?
Categories developed to organize every discovered organism.
What is Biological classification?
The process of organizing living things by their structure and how closely related they are.