Organic Compounds Worksheet - Free Printable

Here is the completed Organic Compound Worksheet with clear, accurate answers and explanations for each question.

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1. What are the characteristics of life?

Answer:
Living organisms typically exhibit the following characteristics:
- Cellular organization (made of one or more cells)
- Reproduction (ability to produce offspring)
- Growth and development (increase in size and complexity)
- Response to stimuli (react to changes in environment)
- Metabolism (chemical reactions to obtain and use energy)
- Homeostasis (maintain stable internal conditions)
- Adaptation through evolution (change over time to better survive)

> *Explanation:* These are the universally accepted traits that distinguish living things from non-living matter.

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2. What are the four basic compounds of life?

Answer:
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic Acids

> *Explanation:* These are the four major classes of macromolecules essential for all known forms of life. They perform structural, catalytic, informational, and energy storage roles.

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3. What element does all living organisms possess?

Answer: Carbon (C)

> *Explanation:* Carbon is the backbone of all organic molecules because it can form four covalent bonds, allowing for complex structures like proteins, DNA, and carbohydrates. All life on Earth is carbon-based.

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4. What is the difference between saturated and unsaturated fats?

Answer:
- Saturated fats have no double bonds between carbon atoms in their fatty acid chains → they are “saturated” with hydrogen atoms. Usually solid at room temperature (e.g., butter, lard).
- Unsaturated fats have one or more double bonds → fewer hydrogen atoms. Usually liquid at room temperature (e.g., olive oil, canola oil). Can be monounsaturated (one double bond) or polyunsaturated (multiple double bonds).

> *Explanation:* The presence of double bonds affects melting point and health impact — unsaturated fats are generally considered healthier.

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5. Please fill in the blanks for the following.

a. Amino Acid + Amino Acid → Dipeptide
*(Two amino acids link via peptide bond)*

b. Glucose + Fructose → Sucrose
*(Disaccharide formed by condensation reaction)*

c. Glucose + Glucose → Lactose
*→ Actually, this is incorrect. Lactose = Glucose + Galactose.*
✔ Correct answer: Glucose + Galactose → Lactose

d. Glucose + Glucose → Maltose
*(Correct — maltose is two glucose units)*

e. Glycerol + Fatty Acid + Fatty Acid + Fatty Acid → Lipid (Fat)
*(Triglyceride formation — 1 glycerol + 3 fatty acids)*

f. Monomer + Monomer → Polymer
*(General principle: small units join to form large molecules)*

g. Glycerol + 2 Fatty Acids → Diglyceride
*(Less common than triglycerides, but possible intermediate)*
*Note: Sometimes written as Glycerol + 3 Fatty Acids → Triglyceride (fat).*

h. Monosaccharide + Monosaccharide → Disaccharide
*(e.g., glucose + fructose → sucrose)*

i. Nucleotide + Nucleotide → Dinucleotide (or part of a polynucleotide chain)
*(Nucleotides link via phosphodiester bonds to form DNA/RNA strands)*

j. ADP + P → ATP
*(Addition of phosphate group to ADP forms ATP — energy storage molecule)*

k. Nitrogenous Base + Phosphate Group + Pentose Sugar → Nucleotide
*(The three components of a nucleotide — e.g., adenine + ribose + phosphate = AMP)*

> *Note:* Some parts may vary slightly depending on curriculum, but these are standard biochemical reactions.

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6. What are the four bases of DNA?

Answer:
Adenine (A), Thymine (T), Cytosine (C), Guanine (G)

> *Explanation:* These nitrogenous bases pair specifically (A-T, C-G) to form the rungs of the DNA ladder. In RNA, uracil (U) replaces thymine.

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7. What is the name of the energy molecule used in animal cells?

Answer: ATP (Adenosine Triphosphate)

> *Explanation:* ATP is the universal energy currency of the cell. It stores and transfers energy within cells for metabolic processes.

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8. When energy is released during a reaction, it is considered what type of reaction?

Answer: Exergonic reaction

> *Explanation:* Exergonic reactions release energy (often as heat or usable chemical energy). They are spontaneous and often drive endergonic (energy-requiring) reactions.

*(Note: Sometimes called “exothermic” if referring only to heat release, but “exergonic” is the broader, more accurate term in biology.)*

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9. How many different types of bases are there in DNA?

Answer: Four

> *Explanation:* As stated in #6 — Adenine, Thymine, Cytosine, and Guanine. Each has a unique structure and pairing rule.

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✔ Completed Worksheet Summary:

| Question | Answer |
|----------|--------|
| 1 | Cellular organization, reproduction, growth/development, response to stimuli, metabolism, homeostasis, adaptation |
| 2 | A. Carbohydrates, B. Lipids, C. Proteins, D. Nucleic Acids |
| 3 | Carbon (C) |
| 4 | Saturated: no double bonds, solid; Unsaturated: has double bonds, liquid |
| 5a | Amino Acid + Amino Acid → Dipeptide |
| 5b | Glucose + Fructose → Sucrose |
| 5c | Glucose + Galactose → Lactose *(corrected)* |
| 5d | Glucose + Glucose → Maltose |
| 5e | Glycerol + Fatty Acid + Fatty Acid + Fatty Acid → Lipid (Fat) |
| 5f | Monomer + Monomer → Polymer |
| 5g | Glycerol + 2 Fatty Acids → Diglyceride *(or Triglyceride if 3)* |
| 5h | Monosaccharide + Monosaccharide → Disaccharide |
| 5i | Nucleotide + Nucleotide → Polynucleotide (or dinucleotide) |
| 5j | ADP + P → ATP |
| 5k | Nitrogenous Base + Phosphate Group + Pentose Sugar → Nucleotide |
| 6 | Adenine, Thymine, Cytosine, Guanine |
| 7 | ATP |
| 8 | Exergonic |
| 9 | Four |

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