Lesson Overview Lesson Overview Energy and Life Lesson Overview 8.1 Energy and Life

 All organisms require energy for  Active transport  Cell division  Movement  Production of proteins

 ATP: adenosine triphosphate  Made up of adenosine + 3 phosphate groups Adenosine Phosphate High-energy bond: Stores much energy *This energy is released when the bond is broken* Adenosine Phosphate Energy ATP ADP ADP: Adenosine diphosphate Cells recycle the ADP to make new ATP to store more energy for future use Many proteins have spots where ATP attaches to provide energy for the protein to do its job, then the ADP is released for recycling

Lesson Overview Lesson Overview Energy and Life THINK ABOUT IT Homeostasis is hard work. Organisms and the cells within them have to grow and develop, move materials around, build new molecules, and respond to environmental changes. What powers so much activity, and where does that power come from?

Lesson Overview Lesson Overview Energy and Life Chemical Energy and ATP Why is ATP useful to cells?

Lesson Overview Lesson Overview Energy and Life Chemical Energy and ATP Why is ATP useful to cells? ATP can easily release and store energy by breaking and re-forming the bonds between its phosphate groups. This characteristic of ATP makes it exceptionally useful as a basic energy source for all cells.

Lesson Overview Lesson Overview Energy and Life Chemical Energy and ATP Energy is the ability to do work. Your cells are busy using energy to build new molecules, contract muscles, and carry out active transport. Without the ability to obtain and use energy, life would cease to exist.

Lesson Overview Lesson Overview Energy and Life Chemical Energy and ATP One of the most important compounds that cells use to store and release energy is adenosine triphosphate (ATP). ATP consists of adenine, a 5-carbon sugar called ribose, and three phosphate groups.

Lesson Overview Lesson Overview Energy and Life Storing Energy Adenosine diphosphate (ADP) looks almost like ATP, except that it has two phosphate groups instead of three. ADP contains some energy, but not as much as ATP. When a cell has energy available, it can store small amounts of it by adding phosphate groups to ADP, producing ATP. ADP is like a rechargeable battery that powers the machinery of the cell.

Lesson Overview Lesson Overview Energy and Life Releasing Energy Cells can release the energy stored in ATP by breaking the bonds between the second and third phosphate groups. Because a cell can add or subtract these phosphate groups, it has an efficient way of storing and releasing energy as needed.

What is ATP? ATP = Adenosine TriPhosphate Adenine + Ribose + 3 Phosphates Adenine Ribose ADENOSINE Phosphate Triphosphate

Why ATP? Phosphates have a large amount of chemical energy. Whenever a bond holding a phosphate is broken, a large amount of usable cellular energy is released. ADENOSINE PP P PPP ENERGY

ATP CYCLE Occurs continuously in cells About 10 million new ATP molecules are made in every cell every second!!! ADP 1.Stored Energy Energy stored in chemical bonds. 2. Releasing Energy Energy released by breaking bonds – used to power cells 3. Energy Depleted ADP has less chemical energy than ATP 4. Making ATP Energy released by other chemical reactions and processes can be used to bond a phosphate to ADP to make ATP + P

Lesson Overview Lesson Overview Energy and Life Using Biochemical Energy One way cells use the energy provided by ATP is to carry out active transport. Many cell membranes contain sodium-potassium pumps. ATP provides the energy that keeps these pumps working, maintaining a balance of ions on both sides of the cell membrane.

Lesson Overview Lesson Overview Energy and Life Using Biochemical Energy ATP powers movement, providing the energy for motor proteins that contract muscle and power the movement of cilia and flagella.

Lesson Overview Lesson Overview Energy and Life Using Biochemical Energy Energy from ATP powers the synthesis of proteins and responses to chemical signals at the cell surface.

Lesson Overview Lesson Overview Energy and Life Using Biochemical Energy ATP is not a good molecule for storing large amounts of energy over the long term. It is more efficient for cells to keep only a small supply of ATP on hand. Cells can regenerate ATP from ADP as needed by using the energy in foods like glucose.

Lesson Overview Lesson Overview Energy and Life Heterotrophs and Autotrophs What happens during the process of photosynthesis?

Lesson Overview Lesson Overview Energy and Life Heterotrophs and Autotrophs What happens during the process of photosynthesis? In the process of photosynthesis, plants convert the energy of sunlight into chemical energy stored in the bonds of carbohydrates.

Lesson Overview Lesson Overview Energy and Life Heterotrophs and Autotrophs Organisms that obtain food by consuming other living things are known as heterotrophs. Some heterotrophs get their food by eating plants. Other heterotrophs, such as this cheetah, obtain food from plants indirectly by feeding on plant-eating animals. Still other heterotrophs, such as mushrooms, obtain food by decomposing other organisms.

Heterotrophs/consumers: Organisms that get energy directly or indirectly from plants Kim Brown

Types of heterotrophs: 1.Herbivore: organisms which feed only on autotrophs (plants). Examples: deer, rabbits, horses Kim Brown

2. Carnivores Organisms which feed only on other heterotrophs (animals). Examples: wolves, hawks, anteaters Kim Brown

3. Omnivores Organisms which feed on both plants and animals Examples: humans, bears, robins, raccoons Black rats are omnivores. They will eat grain, fruit, corn, insects and eggs. Kim Brown

4. Decomposers Animals which feed on decaying organic matter (rotting plants and animals). Examples: earthworms, fungus, some bacteria Mushrooms (right) and earthworms are decomposers Kim Brown

5. Scavengers Animals which feed on other animals which are already dead (scavengers don’t kill their own prey). Examples: hyena, crows, vultures, ants. Kim Brown

Lesson Overview Lesson Overview Energy and Life Heterotrophs and Autotrophs Organisms that make their own food are called autotrophs. Plants, algae, and some bacteria are able to use light energy from the sun to produce food. The process by which autotrophs use the energy of sunlight to produce high-energy carbohydrates that can be used for food is known as photosynthesis.

Autotroph/producer: An organism that makes its own food. Plants and some other organisms make food from sunlight energy (photosynthesis) Kim Brown