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Cellular Respiration: Releasing Energy

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: sciencereadingela
Standards: MS-LS1-7
Languages: English, Spanish

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Reading passage

Reading comprehension

Audio narration

With word word highlighting

Comprehension quiz

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Writing activity

Open-ended response

Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

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About this reader

This middle school science reading passage introduces students to the process of cellular respiration, the mechanism by which cells release energy from glucose. Aligned with NGSS MS-LS1-7, the passage explains the three main stages—glycolysis, Krebs cycle, and electron transport chain—and highlights the difference between cellular respiration and breathing. It also explores both aerobic and anaerobic pathways, using clear examples and real-world applications to help students understand the importance of this process in both plants and animals. The passage includes a glossary, multiple-choice questions, writing prompts, and graphic organizers to support comprehension. Audio integration is available to ensure accessibility for diverse learners.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

cellular1 — Cellular Respiration: Releasing Energy

Cellular respiration is a vital process that allows all living organisms to release energy from food molecules like glucose. This process powers every activity in a cell, from dividing to moving substances in and out. Cellular respiration is not the same as breathing; instead, it is a series of chemical reactions inside cells that break down glucose and produce energy. This energy is used to make ATP (adenosine triphosphate), the molecule that stores and delivers energy for all cellular work. Without cellular respiration, life as we know it could not exist.

How Cellular Respiration Works

Cellular respiration takes place mainly in the mitochondria, often called the "powerhouse" of the cell. The overall chemical equation for cellular respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP. This means one molecule of glucose and six molecules of oxygen are converted into six molecules of carbon dioxide, six molecules of water, and energy (ATP). Cellular respiration occurs in three main stages: glycolysis, the Krebs cycle, and the electron transport chain. In glycolysis, glucose is broken down into smaller molecules, releasing a small amount of ATP. The Krebs cycle further breaks down these molecules, releasing carbon dioxide and more energy. Finally, the electron transport chain uses oxygen to produce most of the ATP. Each step is crucial for extracting the maximum amount of energy from glucose.

Aerobic and Anaerobic Respiration: Differences and Examples

Most of the time, cellular respiration is aerobic, which means it requires oxygen. Aerobic respiration produces up to 38 molecules of ATP from one molecule of glucose, making it highly efficient. However, cells can also perform anaerobic respiration (also known as fermentation) when oxygen is not available. Anaerobic respiration is less efficient, creating only 2 ATP per glucose molecule, but it allows cells to keep working in low-oxygen conditions. For example, muscle cells perform anaerobic respiration during intense exercise, leading to the production of lactic acid. Yeast cells use anaerobic respiration to produce alcohol and carbon dioxide, which is important in baking and brewing industries.

Respiration vs. Breathing: Understanding the Difference

It is important to distinguish cellular respiration from breathing. Breathing is the physical act of inhaling oxygen and exhaling carbon dioxide, which supplies the oxygen needed for cellular respiration. Cellular respiration, on the other hand, is the internal process that actually converts glucose and oxygen into ATP energy. Both processes are connected, but they are not the same. This distinction helps scientists understand how the body takes in vital gases and how cells use them to release energy for life functions.

Every living thing, from plants to animals to single-celled organisms, depends on cellular respiration. Even plants, which make glucose through photosynthesis, must break it down for energy. Understanding cellular respiration helps scientists develop new medical treatments, improve athletic performance, and even design better biofuels. Cellular respiration connects to the core idea that all life relies on the transformation and flow of energy.

Interesting Fact: Mitochondria, the site of cellular respiration, are believed to have originated from ancient bacteria that started living inside other cells billions of years ago!

What is the main purpose of cellular respiration?

To release energy from glucose for cellsTo help plants make food from sunlightTo transport oxygen in the bloodTo protect cells from diseases

Where does most cellular respiration take place inside the cell?

NucleusMitochondriaCell membraneRibosomes

Which of the following is NOT a stage of cellular respiration?

GlycolysisKrebs cycleElectron transport chainPhotosynthesis

What is the main difference between aerobic and anaerobic respiration?

Aerobic uses oxygen; anaerobic does notAerobic occurs only in plantsAnaerobic makes more ATPAnaerobic needs sunlight

In the passage, what does ATP stand for?

Adenosine triphosphateAmino acid transfer proteinActive transport processAutomatic temperature protection

The word 'mitochondria' in the passage means:

A type of energy moleculeThe cell's powerhouse organelleA stage of cellular respirationA protein in the bloodstream

What can be inferred about why muscle cells use anaerobic respiration during hard exercise?

Because there is not enough oxygen for aerobic respirationBecause they do not need energyBecause they only use glucoseBecause mitochondria stop working

How are breathing and cellular respiration connected?

Breathing brings in oxygen needed for cellular respirationThey are the exact same processBoth happen in the lungsCellular respiration helps us breathe

Cellular respiration occurs in both plants and animals. (True/False)

TrueFalse

Anaerobic respiration produces more ATP per glucose molecule than aerobic respiration. (True/False)

TrueFalse