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Studying Life
What is Biology?
bios means…“Life”
-logy means…“study of”
Biology is the
study of living
things.
• 1. Made of cells
Unicellular organisms:
A living thing made of only ONE celluni- means “one”
Some are composed of many cells Multicellular organisms
multi- means “many”
•2. Reproduce
Two types of reproductionAsexual Reproduction
No egg and sperm involvedA piece of an organism becomes
a new organism
Sexual ReproductionEgg and sperm unite
•3. Genetic code
Living things contain genetic codesDNA or RNA
Codes are passed from parent
to offspring
Can be used to
solve crimes.
4. Growth and Development
All living things grow during at least part of their lives
Unicellular increase in size
Multicellular grow in size and change or develop
5. Need Materials and Energy
METABOLISMall of the chemical reactions within the body Materials are broken down or built up
Energy is a requirement (used) and must be obtained (available)
6. Respond to the Environment
7. Homeostasis
organisms keep internal conditions, constant.Example: Temperature
8. Evolution
Organisms show relationship to other organisms
A group of organisms
change over time due to
survival of the fittest
QUICK PRACTICE
The following are all examples of the characteristics of life. Identify each one by matching a word from the top to a word phrase from the bottom.
A. Evolution D. genetic code G. Respond to stimulus
B. Made of cells E. Grow and develop H. Homeostasis C. Reproduce F. Use/need energy 1. A person looks like their mother.2. You eat a hamburger for lunch. 3. A baby gains 3 pounds in one week and begins to recognize
voices. 4. A polar bear has white fur to blend in with the snow. 5. Your start to cry whenever you get a shot at the doctor’s office. 6. You begin to shiver because it is cold outside. 7. Red and white particles make up part of your blood. 8. A chick breaks out of an egg.