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Chapter 3: Problem 45

What are the four classes of lipids and what is an example of each? a. 1\. lipids like margarine 2\. wax like the coating on feathers 3\. phospholipids like cell membrane constituents 4\. steroid like cholesterol b. 1\. lipids like phosphatidylserine 2\. wax like phosphatidic acid 3\. phospholipids like oleic acid 4\. steroid like epinephrine c. 1\. lipids like phosphatidic acid 2\. waxes like margarine 3\. phospholipids like phosphatidylcholine 4\. steroids like testosterone d. 1\. lipids like cholesterol 2\. waxes like the coating on feathers 3\. phospholipids like phosphatidylserine 4\. steroids like margarine

Short Answer

Expert verified
Option (a) is the correct answer.

Step by step solution

01

Identify the Four Classes of Lipids

The four classes of lipids are: lipids, wax, phospholipids, and steroids.
02

Define Each Class and Example

For each class of lipids, identify the correct example from the provided options. The correct examples are typically found in biological contexts.
03

Analyze Option (a)

1. Lipids: Margarine is a type of lipid.2. Wax: The coating on feathers is a type of wax.3. Phospholipids: Cell membrane constituents are phospholipids.4. Steroid: Cholesterol is a type of steroid.
04

Analyze Option (b)

1. Lipids: Phosphatidylserine is actually a phospholipid, not a general lipid.2. Wax: Phosphatidic acid is not a wax.3. Phospholipids: Oleic acid is a lipid but not a phospholipid.4. Steroid: Epinephrine is a hormone but not a steroid.
05

Analyze Option (c)

1. Lipids: Phosphatidic acid is a phospholipid, not a general lipid.2. Waxes: Margarine is a lipid, not a wax.3. Phospholipids: Phosphatidylcholine is correctly identified as a phospholipid.4. Steroids: Testosterone is correctly identified as a steroid.
06

Analyze Option (d)

1. Lipids: Cholesterol is actually a steroid.2. Waxes: The coating on feathers is correctly identified as a wax.3. Phospholipids: Phosphatidylserine is correctly identified as a phospholipid.4. Steroids: Margarine is a lipid, not a steroid.
07

Determine the Correct Answer

Based on the analysis, option (a) contains the correct examples for each class of lipids.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

lipids
Lipids are organic compounds that are fatty acids or their derivatives. They are insoluble in water but soluble in organic solvents. Lipids play a crucial role in the structure and function of cell membranes, energy storage, and signaling. They can be found in both plants and animals. Common examples include fats, oils, and some vitamins. One well-known example of a lipid is margarine, which is often used as a spread or for cooking.
wax
Waxes are a type of lipid that are typically long-chain fatty acids esterified to long-chain alcohols. They are known for their water-repellant properties. Waxes serve several functions in nature, such as providing a protective coating to plants and animals. For instance, the coating on feathers is a type of wax that helps birds to stay dry. Waxes are also used commercially in products like candles, polishes, and cosmetics.
phospholipids
Phospholipids are a class of lipids that are a major component of all cell membranes. They consist of two fatty acids bonded to a phosphate group. Phospholipids are amphipathic, meaning they have both hydrophobic (water-repelling) and hydrophilic (water-attracting) regions. This unique structure allows them to form bilayers that are fundamental to cell membranes. An example of a phospholipid is phosphatidylcholine, which is essential for constructing cell membranes and maintaining their fluidity.
steroids
Steroids are a type of lipid characterized by a carbon skeleton consisting of four fused rings. Unlike other lipids, steroids do not contain fatty acids. They have a variety of functions in the body, including as hormones and components of cell membranes. Cholesterol is a well-known steroid; it is essential for the structural integrity and fluidity of cell membranes. Steroids also regulate metabolism, immune function, and reproductive processes.

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