Energy and Life

Think About It! What powers the activities of organisms and where does that power come from?

Energy Is the ability to do work. Almost every activity in modern society depends upon energy. Comes in many forms, including heat, light, and electricity.

Energy Can be stored in chemical compounds Adenosine triphosphate (ATP) and adenosine diphosphate (ADP) are the chemical compounds that cells use to store and release energy.

Energy ATP Consist of adenine, a 5 – carbon ribose sugar and three phosphate groups. Releases and stores energy by breaking and re-forming the bonds between the phosphate groups.

Energy ADP Consists of adenine, a 5 – carbon ribose sugar, and two phosphate groups. Stores small amounts of energy when a phosphate group is added to form ATP.

Energy

Cells and Energy Cells use the energy of ATP to carry out active transport. Membrane protein pumps move ions out of and into cells.

Cells and Energy ATP energy powers the important events in the cell These include protein synthesis and cell reproduction.

Cells and Energy Cells keep a small supply of ATP on hand ATP is not a good molecule for storing large amounts of energy. Glucose stores 90 times more energy than ATP.

Photosynthesis Is the process that autotrophs use to convert the energy of sunlight into high energy carbohydrates (sugars and starches) that can be used as food.

Assignment (Yippieeee!!!) Answer questions 1 & 2 of Assessment 8.1 on page 228 with complete sentences. Write the questions and answers in your science notebooks.