Tristearin and Triolein are --------- lipids

Options

A. saturated, unsaturated
B. unsaturated, unsaturated
C. saturated, saturated
D. unsaturated, saturated

Answer

To answer the question regarding Tristearin and Triolein, we need to analyze the structures and properties of these two lipids. Here’s a step-by-step solution:

### Step 1: Understand the Definitions
- **Saturated Lipids**: These are lipids that have no double bonds between the carbon atoms in their fatty acid chains. They are typically solid at room temperature.
- **Unsaturated Lipids**: These contain one or more double bonds in their fatty acid chains. They are usually liquid at room temperature.

**Hint**: Remember that the presence of double bonds in fatty acids indicates unsaturation.

### Step 2: Analyze the Structure of Tristearin
- Tristearin is a triglyceride formed from glycerol and three saturated fatty acids, specifically stearic acid (C18H36O2).
- Its chemical structure can be represented as:
\[ \text{CH}_2\text{(OCOC}_{15}\text{H}_{31})_3 \]
- Since it is composed of saturated fatty acids, Tristearin is classified as a saturated lipid.

**Hint**: Look for the types of fatty acids that make up the triglyceride to determine if it is saturated or unsaturated.

### Step 3: Analyze the Structure of Triolein
- Triolein is also a triglyceride but is formed from glycerol and three unsaturated fatty acids, specifically oleic acid (C18H34O2).
- Its chemical structure can be represented as:
\[ \text{CH}_2\text{(OCOC}_{15}\text{H}_{33})_3 \]
- The presence of double bonds in oleic acid indicates that Triolein is an unsaturated lipid.

**Hint**: Identify the fatty acids in the triglyceride and check for double bonds to classify it correctly.

### Step 4: Conclusion
- Based on the analysis:
- **Tristearin** is a **saturated lipid**.
- **Triolein** is an **unsaturated lipid**.

Thus, the answer to the question is that Tristearin and Triolein are **saturated and unsaturated lipids**, respectively.

**Final Answer**: Tristearin is a saturated lipid, and Triolein is an unsaturated lipid.