Chasing for energy and life guide answer key epub download do you really need this file of energy and life guide answer key epub download it takes me 27. Start studying Section 8-1, 8-2, 8-3 Energy and Life. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

• Anatomy And Physiology Study Guide Answer Key

Energy and Life Organisms use sugar as a source of energy to do work. All living things require energy to do the work necessary for survival and reproduction. This is true for bacteria, plants, and animals.

But what is energy? Energy is simply the ability to do work, where work is done when a force moves an object.

Let's consider your own needs for a moment. You need energy to turn on and turn off your computer.

You need energy to get out of bed in the morning. You even need energy to listen to this lesson and think about what it says. And, yes, you need energy to reproduce. So where does energy come from and how do we use it? On Earth, energy ultimately comes from the sun.

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Plants use the sun's energy to make sugar. Organisms, in turn, use sugar as a source of energy to do work. In this lesson, we will explore how living organisms utilize energy.

We will first consider how plants use energy from the sun to make sugar. Then we will explore how organisms use energy from the sugar to do work. How Plants Transform Energy from the Sun Plants use energy from sunlight to make sugar and oxygen from carbon dioxide and water.

The process by which carbon dioxide and water are converted to sugar and oxygen using sunlight is referred to as. This is an, meaning energy is required by the reaction. Specifically, energy is required to put the carbon dioxide and the water molecules together to form sugar. Sun provides the energy needed to drive photosynthesis, and some of the energy used to make the sugar is stored in the sugar molecule. The sun provides the energy needed to drive photosynthesis. How Organisms Use Energy from Sugar Now that we know how plants synthesize sugar, let's explore how organisms use the sugar as a source of energy.

In short, organisms break down the sugar to release its stored energy. The energy released from the breakdown of sugar is used by the cells to make another chemical that we call adenosine triphosphate, or simply abbreviated ATP. The synthesis of ATP by cells is referred to as cellular respiration. This is an as energy is released as a result of the reaction.

Energy is released when the sugar is broken down into smaller parts: carbon dioxide and water. As you can see on the screen, sugar and oxygen are the reactants, and carbon dioxide and water are the products of cellular respiration. Does that reaction look familiar?

Well it should, because cellular respiration is simply the reverse of photosynthesis. Photosynthesis and cellular respiration are related as the products of one become the reactants for the other.

In fact, cellular respiration and photosynthesis are dependent on one another. Why does the cell have to convert energy stored in sugar into energy stored in ATP?

Why can't the cell just use sugar in the first place, as a source of energy, to do the work it needs to do? In other words, why is cellular respiration necessary for life?

Anatomy And Physiology Study Guide Answer Key

To answer that question, let's think of energy as being analogous to money. We all like money. While the Japanese yen is indeed real money, you can't use it to buy goods in an American store. Therefore, you have to first exchange the yen for dollars and then you can buy stuff in an American store.

Likewise, sugar is a good source of energy. Sugar is a good source of energy but cells can't directly use it to do work. Therefore, the sugar must first be converted into a more usable form, and that usable form is ATP.

Let's look at an example: our muscle cells need and use ATP to do the work of contraction. The muscles break down the sugar to get the energy they need to make ATP. Cellular respiration is the reverse of photosynthesis.

Lesson Summary In summary, all living organisms require energy for both survival and reproduction. Energy is the ability to do work, where work is done when a force moves an object.

While the sun provides energy for our entire planet, the sun's energy must be transformed into more usable forms for living organisms. Plants utilize photosynthesis for the production of sugar and oxygen from carbon dioxide and water.

Photosynthesis is endergonic as energy is required by the reaction. The sun provides the energy for photosynthesis. Cells, in turn, utilize sugar as a source of energy. Cellular respiration is the synthesis of ATP using energy released by the breakdown of sugar to carbon dioxide and water.

As energy is released by the reaction, the breakdown of sugar is exergonic. The products of cellular respiration are carbon dioxide and water.

These products are used by plants to make sugar and oxygen through photosynthesis. The energy released from the breakdown of sugar is used by cells to make ATP, which is the most usable form of energy by cells. Cells then break down the ATP to provide energy necessary to perform work - for example, contraction of our muscles. Learning Outcomes Completing this lesson should enable you to:. Define energy and work.

Differentiate between an endergonic and exergonic reaction. Summarize photosynthesis and cellular respiration as well as identify the products of each. Understand why photosynthesis and cellular respiration are dependent on each other.

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