Carbs Worksheet Answers | PDF - Free Printable
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Step-by-step solution for: Carbs Worksheet Answers | PDF
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Step-by-step solution for: Carbs Worksheet Answers | PDF
It looks like you've uploaded a scanned image of a Carbohydrates Worksheet that includes several questions about carbohydrates, their structure, and classification. The worksheet appears to be partially completed with handwritten answers. Let's go through the problems step by step, solve any unanswered or unclear parts, and explain the solutions.
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#### 1. Fill in the blank:
> A molecule composed of many monosaccharide units is called a ________.
> - Answer: *Polysaccharide*
✔ Correct. Polysaccharides are long chains of monosaccharide units linked together via glycosidic bonds.
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#### 2. True or False Questions:
> 1. True or False: Carbohydrates are made up of carbon, hydrogen, and oxygen.
> - ✔ True – General formula for carbohydrates is (CH₂O)ₙ.
> 2. True or False: Glucose is an example of a polysaccharide.
> - ✘ False – Glucose is a monosaccharide, not a polysaccharide.
> 3. True or False: Monosaccharides are made of monomers.
> - ✘ False – Monosaccharides are monomers themselves; they are not made of smaller monomers.
> 4. True or False: Polysaccharides are made of monomers.
> - ✔ True – Polysaccharides are polymers made of repeating monosaccharide monomers.
> 5. True or False: Polysaccharides are the simplest type of carbohydrate.
> - ✘ False – Monosaccharides are the simplest type.
✔ All these answers are correctly marked as true/false in your scan.
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#### 6. Give an example of a type of polysaccharide:
> - Answer: *Starch*
> - Where is it found? *In plants*
> - What is its function? *Energy storage*
✔ Correct. Starch is a storage polysaccharide in plants. Other examples include glycogen (in animals), cellulose, and chitin.
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#### 7. Label the monosaccharides in the picture:
The diagram shows two glucose molecules forming a disaccharide (maltose) via a condensation reaction.
- Left molecule: Glucose
- Right molecule: Glucose
> What chemical bond is formed between them?
> - Glycosidic bond – Specifically, an α-1,4-glycosidic bond in maltose.
> What chemical reaction occurs?
> - Condensation (dehydration synthesis) – Water is removed when the bond forms.
✔ Your answer "Glucose" and "Glycosidic bond" is correct.
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#### 8. Identify the structures below:
There are three diagrams:
1. First structure:
- It has a six-membered ring with a CH₂OH group and OH groups arranged in a specific way.
- This is Glucose (specifically α-glucose).
2. Second structure:
- Also a six-membered ring, but the hydroxyl group on the anomeric carbon is pointing down (β configuration).
- This is Galactose.
3. Third structure:
- Five-membered ring (furanose form) with a CH₂OH group and other substituents.
- This is Fructose (specifically β-fructofuranose).
✔ Your answers:
- First: Glucose
- Second: Galactose
- Third: Fructose → All correct!
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#### 9. The chemical combination of two monosaccharides to form a disaccharide is called:
> - Condensation (or dehydration synthesis)
✔ Correct.
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#### 10. Examples of disaccharides:
> - Maltose (glucose + glucose)
> - Sucrose (glucose + fructose)
> - Lactose (galactose + glucose)
Your answer: “Maltose” is correct.
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#### 11. Which of the following is a disaccharide?
> - Choices: Glucose, Fructose, Galactose, Maltose
> - ✔ Maltose is the only disaccharide listed.
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#### 12. What is the difference between starch and cellulose?
> - Both are polysaccharides made of glucose.
> - Starch: α-1,4-glycosidic bonds → helical structure → digestible by humans.
> - Cellulose: β-1,4-glycosidic bonds → straight chains → indigestible by humans (but important for fiber).
✔ You wrote: “Starch is digestible, cellulose is not.” That’s accurate.
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#### 13. What is the function of cellulose in plants?
> - Structural support – Cellulose fibers provide strength to cell walls.
✔ Your answer: “Structural support” is correct.
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#### 14. Why can’t humans digest cellulose?
> - Humans lack the enzyme cellulase, which breaks β-1,4-glycosidic bonds.
> - Ruminants (like cows) have symbiotic bacteria that produce cellulase.
✔ Your answer: “We don’t have the enzyme to break it down.” → Good explanation.
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#### 15. What is the role of glycogen in animals?
> - Energy storage in liver and muscle cells.
✔ Correct.
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#### 16. What is the name of the process that breaks down a disaccharide into monosaccharides?
> - Hydrolysis – Water is added to break the glycosidic bond.
✔ You wrote: “Hydrolysis” → Correct.
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Your answers on the worksheet are mostly correct and well-understood. Here’s a quick recap of key concepts:
| Concept | Explanation |
|--------|-------------|
| Monosaccharides | Simple sugars (e.g., glucose, fructose, galactose) |
| Disaccharides | Two monosaccharides joined (e.g., maltose, sucrose, lactose) |
| Polysaccharides | Long chains (e.g., starch, glycogen, cellulose) |
| Glycosidic bond | Covalent bond linking sugar units |
| Condensation | Forms bonds (removes water) |
| Hydrolysis | Breaks bonds (adds water) |
---
Let me know if you’d like this worksheet turned into a clean, printable version or need help with any additional biology topics!
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Worksheet Analysis & Solutions
#### 1. Fill in the blank:
> A molecule composed of many monosaccharide units is called a ________.
> - Answer: *Polysaccharide*
✔ Correct. Polysaccharides are long chains of monosaccharide units linked together via glycosidic bonds.
---
#### 2. True or False Questions:
> 1. True or False: Carbohydrates are made up of carbon, hydrogen, and oxygen.
> - ✔ True – General formula for carbohydrates is (CH₂O)ₙ.
> 2. True or False: Glucose is an example of a polysaccharide.
> - ✘ False – Glucose is a monosaccharide, not a polysaccharide.
> 3. True or False: Monosaccharides are made of monomers.
> - ✘ False – Monosaccharides are monomers themselves; they are not made of smaller monomers.
> 4. True or False: Polysaccharides are made of monomers.
> - ✔ True – Polysaccharides are polymers made of repeating monosaccharide monomers.
> 5. True or False: Polysaccharides are the simplest type of carbohydrate.
> - ✘ False – Monosaccharides are the simplest type.
✔ All these answers are correctly marked as true/false in your scan.
---
#### 6. Give an example of a type of polysaccharide:
> - Answer: *Starch*
> - Where is it found? *In plants*
> - What is its function? *Energy storage*
✔ Correct. Starch is a storage polysaccharide in plants. Other examples include glycogen (in animals), cellulose, and chitin.
---
#### 7. Label the monosaccharides in the picture:
The diagram shows two glucose molecules forming a disaccharide (maltose) via a condensation reaction.
- Left molecule: Glucose
- Right molecule: Glucose
> What chemical bond is formed between them?
> - Glycosidic bond – Specifically, an α-1,4-glycosidic bond in maltose.
> What chemical reaction occurs?
> - Condensation (dehydration synthesis) – Water is removed when the bond forms.
✔ Your answer "Glucose" and "Glycosidic bond" is correct.
---
#### 8. Identify the structures below:
There are three diagrams:
1. First structure:
- It has a six-membered ring with a CH₂OH group and OH groups arranged in a specific way.
- This is Glucose (specifically α-glucose).
2. Second structure:
- Also a six-membered ring, but the hydroxyl group on the anomeric carbon is pointing down (β configuration).
- This is Galactose.
3. Third structure:
- Five-membered ring (furanose form) with a CH₂OH group and other substituents.
- This is Fructose (specifically β-fructofuranose).
✔ Your answers:
- First: Glucose
- Second: Galactose
- Third: Fructose → All correct!
---
#### 9. The chemical combination of two monosaccharides to form a disaccharide is called:
> - Condensation (or dehydration synthesis)
✔ Correct.
---
#### 10. Examples of disaccharides:
> - Maltose (glucose + glucose)
> - Sucrose (glucose + fructose)
> - Lactose (galactose + glucose)
Your answer: “Maltose” is correct.
---
#### 11. Which of the following is a disaccharide?
> - Choices: Glucose, Fructose, Galactose, Maltose
> - ✔ Maltose is the only disaccharide listed.
---
#### 12. What is the difference between starch and cellulose?
> - Both are polysaccharides made of glucose.
> - Starch: α-1,4-glycosidic bonds → helical structure → digestible by humans.
> - Cellulose: β-1,4-glycosidic bonds → straight chains → indigestible by humans (but important for fiber).
✔ You wrote: “Starch is digestible, cellulose is not.” That’s accurate.
---
#### 13. What is the function of cellulose in plants?
> - Structural support – Cellulose fibers provide strength to cell walls.
✔ Your answer: “Structural support” is correct.
---
#### 14. Why can’t humans digest cellulose?
> - Humans lack the enzyme cellulase, which breaks β-1,4-glycosidic bonds.
> - Ruminants (like cows) have symbiotic bacteria that produce cellulase.
✔ Your answer: “We don’t have the enzyme to break it down.” → Good explanation.
---
#### 15. What is the role of glycogen in animals?
> - Energy storage in liver and muscle cells.
✔ Correct.
---
#### 16. What is the name of the process that breaks down a disaccharide into monosaccharides?
> - Hydrolysis – Water is added to break the glycosidic bond.
✔ You wrote: “Hydrolysis” → Correct.
---
✔ Final Summary:
Your answers on the worksheet are mostly correct and well-understood. Here’s a quick recap of key concepts:
| Concept | Explanation |
|--------|-------------|
| Monosaccharides | Simple sugars (e.g., glucose, fructose, galactose) |
| Disaccharides | Two monosaccharides joined (e.g., maltose, sucrose, lactose) |
| Polysaccharides | Long chains (e.g., starch, glycogen, cellulose) |
| Glycosidic bond | Covalent bond linking sugar units |
| Condensation | Forms bonds (removes water) |
| Hydrolysis | Breaks bonds (adds water) |
---
Let me know if you’d like this worksheet turned into a clean, printable version or need help with any additional biology topics!
Parent Tip: Review the logic above to help your child master the concept of chemistry of carbohydrates worksheet.
