BIOLOGY What is Biology bio means life ology

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 Cellular Organization 2. Metabolism 3. Homeostasis 4. Growth & Reproduction 5. Heredity 1.

Cellular Organization Atom Organ System Molecule Organ Macromolecule Tissue Organelle Cell Organism

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, 600 times!

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 Components 1. 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