characteristics of life
DESCRIPTION
Introduction to Biology NotesTRANSCRIPT
BIOLOGY
What is Biology?•“bio-” means life•“-ology” means the study of
So…•Biology is the study of life
What does it mean to be “living”?
Characteristics of Life
1.Cellular Organization2.Metabolism3.Homeostasis4.Growth & Reproduction5.Heredity
Atom
Molecule
Macromolecule
Organelle Cell
Tissue
Organ
Organ System
OrganismCellular Organization
Cellular Organization
•Did you know?•Your body contains about 100 trillion cells•That’s how many centimeters long a string would be wrapped around the world 1,600times!
Metabolism
•The transfer of energy from one form to another in cells
•Examples•Moving•Growing•Thinking•Digesting
•Sunlight Plants Animals Eat Energy to grow, move, etc.
Homeostasis
•The body’s ability to maintain relatively stable internal conditions even though the outside world is continuously changing.•Literal translation “unchanging”
•Homeo = the same•Stasis = standing still
Homeostasis
• Variable Components1. Receptor
• Monitors and responds to changes then sends information to control center
2. Control center• Determines level of variable to be maintained,
analyzes information, and determines appropriate response
3. Effector• The result of response then feedback to influence
stimulus by
Growth & Reproduction
•Bacteria increase in size and simply split in two, as often as every 15 minutes
•Other more complex organisms•Grow by increasing the number of cells•Reproduce sexually
Heredity
•All organisms possess a genetic system that is based on replication and duplication of DNA