Biology 102A Characteristics of life notes

Warm Up # ___ A group of 100 Hispanic women age 20 with curly hair, who used Pert on a daily basis, enrolled in a study. A new shampoo is being tested on these women to see if it will help straighten hair. For 10 weeks group A washed their hair with this new shampoo instead of their original one. Group B was given the placebo, which was the exact shampoo they had been using. They documented how curly their hair was on a scale of 1-10 daily. One was straight and ten was curly. At the end of the experiment the averages were documented and recorded. Part one: List the control variables, dependent and independent variables. Part two: identify the control group and experimental group

What is Biology?  The study of living things (organisms)  bio-life  ology- the study of

8 Characteristics of LIFE 1.Living Things are made up of Cells. a.) CELL: Collection of living material enclosed within a barrier b.) cells are basic unit of life c.) Unicellular: made up of one cell d.) Multicellular: made up of many cells Unicellular Multicellular

2. Living Things Reproduce: a.) produce offspring which resemble parents b.)asexual reproduction: has only one parent c.) sexual reproduction: requires two parents Asexual Sexual

3. Living Things are based on a genetic code. a.) inheritance of traits is carried on DNA

4. Living things Grow and Develop a.) GROWTH: increase in size & shape b.) DEVELOPMENT: mature over time c.) living things have a lifespan Growth Development

5. Living Things Use & Need Energy a.) energy comes from food, used to maintain body b.) AUTOTROPH: produce own food c.) HETEROTROPH: must consume food d.) DECOMPOSER: breaks down dead material for food

6. Living things respond to their surroundings a.) they react to a stimulus b.) an action causes a reaction c. ) reaction is called a response d.) this involves one individual

7. Living things maintain a stable internal environment a.) HOMEOSTASIS: internal balance b.) examples: sweating, panting, shivering, etc.

8. Living things Evolve a.) adapt to long-range changes in environment b.) change to better survive in environment c.) these changes take place over a long period of time & involve the entire species

Reinforcement The following are all examples of the characteristics of life. Identify each one. A.Adapt D. genetic code G. Respond to stimulus B.Made of cells E. Grow and develop H. Homeostasis C.Reproduce F. Use/need energy 1.You eat a hamburger for lunch. 2.A baby gains 3 pounds in one week and begins to recognize voices. 3.A polar bear has white fur to blend in with the snow. 4.Your start to cry whenever you get a shot at the doctor’s office. 5.You begin to shiver because it is cold outside. 6.Red and white particles make up part of your blood. 7.A chick breaks out of an egg.