What type of lipid is the major component in a lipid bilayer structure in a membrane? A) sphingolipid B) steroid C) phospholipid D) prostaglandin E) high density lipoprotein

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### Lipid Components in a Lipid Bilayer Structure

**Question 5 of 19**

What type of lipid is the major component in a lipid bilayer structure in a membrane?

- A) Sphingolipid
- B) Steroid
- C) Phospholipid
- D) Prostaglandin
- E) High density lipoprotein

---

**Explanation:**

Lipid bilayers, which make up the fundamental structure of cell membranes, consist primarily of **phospholipids**. These molecules have a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails," allowing them to form the characteristic bilayer with heads facing outwards towards the water on both sides and tails tucked inwards, away from the water.

**Options:**

- **A) Sphingolipid:** Though important in membrane structure, especially in nerve cells, sphingolipids are not the primary lipid in the bilayer.
- **B) Steroid:** Steroids, such as cholesterol, are present in membranes but do not make up the bilayer's main fabric.
- **C) Phospholipid:** The correct answer. Phospholipids are the chief component of cell membrane bilayers.
- **D) Prostaglandin:** These are signaling molecules and not major structural components of membranes.
- **E) High density lipoprotein:** Important for lipid transport in the bloodstream but not a constituent of the bilayer structure.

---

The question is sourced from an interactive educational module. The image also includes a partial view of a keyboard from a MacBook Air underneath the question text. The specific structure in the image centers around selecting the correct type of lipid, emphasizing the importance of phospholipids in cell membranes.
Transcribed Image Text:### Lipid Components in a Lipid Bilayer Structure **Question 5 of 19** What type of lipid is the major component in a lipid bilayer structure in a membrane? - A) Sphingolipid - B) Steroid - C) Phospholipid - D) Prostaglandin - E) High density lipoprotein --- **Explanation:** Lipid bilayers, which make up the fundamental structure of cell membranes, consist primarily of **phospholipids**. These molecules have a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails," allowing them to form the characteristic bilayer with heads facing outwards towards the water on both sides and tails tucked inwards, away from the water. **Options:** - **A) Sphingolipid:** Though important in membrane structure, especially in nerve cells, sphingolipids are not the primary lipid in the bilayer. - **B) Steroid:** Steroids, such as cholesterol, are present in membranes but do not make up the bilayer's main fabric. - **C) Phospholipid:** The correct answer. Phospholipids are the chief component of cell membrane bilayers. - **D) Prostaglandin:** These are signaling molecules and not major structural components of membranes. - **E) High density lipoprotein:** Important for lipid transport in the bloodstream but not a constituent of the bilayer structure. --- The question is sourced from an interactive educational module. The image also includes a partial view of a keyboard from a MacBook Air underneath the question text. The specific structure in the image centers around selecting the correct type of lipid, emphasizing the importance of phospholipids in cell membranes.
---

### Classify the Bonds in the Unsaturated Fatty Acid

#### Question 4 of 19

**Classify the bonds labeled 1 and 2 in the following unsaturated fatty acid:**

![Molecular structure](https://via.placeholder.com/150)

#### Options:
- **A) cis, cis**
- **B) cis, trans**
- **C) trans, cis**
- **D) trans, trans**

#### Graph and Diagram Explanation:

The diagram provided in the question is a two-dimensional structural representation of an unsaturated fatty acid. The structure includes two double bonds, each labeled as bond 1 and bond 2. 

1. **Bond 1**: To the left in the structure, the double bond here should be analyzed for its geometric configuration (cis or trans).
2. **Bond 2**: To the right, this double bond should also be analyzed for its geometric configuration (cis or trans).

In a **cis** configuration, the hydrogen atoms attached to the carbons of the double bond are on the same side, whereas in a **trans** configuration, they are on opposite sides.

To correctly classify the bonds, one must observe the spatial arrangement of the atoms around each double bond.

---

This transcription helps explain the given problem, providing context and details that might be useful for a student learning about unsaturated fatty acids and their geometric configurations.
Transcribed Image Text:--- ### Classify the Bonds in the Unsaturated Fatty Acid #### Question 4 of 19 **Classify the bonds labeled 1 and 2 in the following unsaturated fatty acid:** ![Molecular structure](https://via.placeholder.com/150) #### Options: - **A) cis, cis** - **B) cis, trans** - **C) trans, cis** - **D) trans, trans** #### Graph and Diagram Explanation: The diagram provided in the question is a two-dimensional structural representation of an unsaturated fatty acid. The structure includes two double bonds, each labeled as bond 1 and bond 2. 1. **Bond 1**: To the left in the structure, the double bond here should be analyzed for its geometric configuration (cis or trans). 2. **Bond 2**: To the right, this double bond should also be analyzed for its geometric configuration (cis or trans). In a **cis** configuration, the hydrogen atoms attached to the carbons of the double bond are on the same side, whereas in a **trans** configuration, they are on opposite sides. To correctly classify the bonds, one must observe the spatial arrangement of the atoms around each double bond. --- This transcription helps explain the given problem, providing context and details that might be useful for a student learning about unsaturated fatty acids and their geometric configurations.
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