📚 Topic Summary
Carbohydrates are essential biomolecules that serve as a primary source of energy for living organisms. They are composed of carbon, hydrogen, and oxygen atoms, typically in a ratio of 1:2:1. Carbohydrates can be classified into three main groups based on their structure and complexity: monosaccharides, disaccharides, and polysaccharides. Monosaccharides are the simplest sugars, disaccharides are formed by two monosaccharides joined together, and polysaccharides are complex carbohydrates made up of many monosaccharides linked together.
🧪 Part A: Vocabulary
Match the terms with their correct definitions:
| Term |
Definition |
| 1. Monosaccharide |
A. A complex carbohydrate made of many sugar molecules. |
| 2. Disaccharide |
B. A simple sugar, like glucose or fructose. |
| 3. Polysaccharide |
C. A sugar formed when two monosaccharides are joined together. |
| 4. Glucose |
D. A common monosaccharide used as the primary energy source by cells. |
| 5. Starch |
E. A polysaccharide used for energy storage in plants. |
(Answers: 1-B, 2-C, 3-A, 4-D, 5-E)
📝 Part B: Fill in the Blanks
Complete the following paragraph using the words provided: glucose, energy, polysaccharides, disaccharides, monosaccharides.
Carbohydrates are vital sources of ________ for living organisms. The simplest carbohydrates are called ________, such as ________. When two of these simple sugars combine, they form ________. Complex carbohydrates made up of many sugar units are known as ________.
(Answers: energy, monosaccharides, glucose, disaccharides, polysaccharides)
🤔 Part C: Critical Thinking
Explain how the structure of polysaccharides like starch and cellulose relates to their different functions in living organisms. Be specific!