2.1 What is Life?.

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Presentation transcript:

2.1 What is Life?

POINT > Identify 6 characteristics of living things POINT > Identify the elements that are found in living organisms POINT > Describe 5 types of molecules in living organisms POINT > Identify 4 things all organisms need POINT > Define autotroph and heterotroph

POINT > Identify 6 characteristics of living things All living things: 1. Can reproduce 2. Grow and develop

POINT > Identify 6 characteristics of living things 3. Respond to the environment 4. Use energy

POINT > Identify 6 characteristics of living things 5. Use “chemicals of life” especially DNA 6. Are made of cells

CHECK: Identify 2 characteristics of living things

POINT > Identify the elements that are found in living organisms Living things are mostly composed of 4 elements:

POINT > Identify the elements that are found in living organisms Living things are mostly composed of 4 elements: Carbon, hydrogen, oxygen, and nitrogen Other elements are in living things in smaller amounts: P, Na, Cl, S, Fe, Ca, K, etc

POINT > Describe 5 types of molecules in living organisms Water: H2O is required for the chemical reactions that happen inside cells Proteins do most of the work in the cell. We get protein from animal meat and some vegetables Carbohydrates (sugars) are used for cell energy. We get most carbohydrates from plants

POINT > Describe 5 types of molecules in living organisms 4. Lipids (fats) are important for energy storage. Lipids also make up cell membranes 5. Nucleic acids (DNA and RNA) carry the genetic information in living organisms

CHECK: Identify the 4 main elements in living things. What type of molecule is very important in cell membranes? What type of molecule stores genetic information?

CHECK: What molecule helps chemical reactions happen inside of cells? What type of molecule is used to store energy? What type of molecule does most of the work inside the cell?

POINT > Identify 4 things all organisms need All living things need: Water Energy (from the sun or from eating food) Nutrients: vitamins and minerals that cells need A place to live

POINT > Define autotroph and heterotroph All living things need energy. Autotrophs are organisms that get energy directly from the sun* Autotrophs include plants, algae, and some bacteria *Some autotrophs get energy from chemicals

POINT > Define autotroph and heterotroph Heterotrophs are organisms that get energy from other organisms Heterotrophs include animals, fungi, protists and some bacteria

CHECK: What are 4 things all living things need? What is an autotroph? What kinds of organisms are autotrophs? What is a heterotroph? What kinds of organisms are heterotrophs?

Homework: Read pages 34-40 Finish the Study Guide. Find the answers in the textbook! GRAS pages 23-26