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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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Most popular questions from this chapter

Could the primitive atmosphere illustrated by the Urey and Miller experiment be reproduced on today's Earth? Why or why not? a. The primitive atmosphere cannot be created due to the oxidizing atmosphere and lack of hydrogen. b. The primitive atmosphere can be created as the atmosphere is reducing and the Earth has sufficient hydrogen to reproduce the conditions. c. The primitive atmosphere cannot be created due to the presence of abundant water and hydrogen in the atmosphere. d. The primitive atmosphere can be created as the atmosphere is oxidizing and has less of hydrogen.

Urey and Miller proposed that a series of reactions occurred, which ultimately resulted in amino acid formation. Which of the following is true based upon their theory? a. Hydrogen and nitrogen combined to create amino acids. b. Hydrogen and oxygen combined to create macromolecules. c. Nitrogenous bases combined to form monomers then RNA. d. Periodic elements combined to create molecules then DNA.

What role do electrons play in dehydration synthesis and hydrolysis? a. Electrons are added to \(\mathrm{OH}\) and \(\mathrm{H}\) ion in the dehydration synthesis. They are removed from \(\mathrm{OH}\) and \(\mathrm{H}\) in hydrolysis. b. Electrons are transferred from OH and H ions to the monomers in dehydration synthesis. They are taken up by the H and OH ions from the monomers in hydrolysis. c. Electrons are removed from \(\mathrm{OH}\) and \(\mathrm{H}\) in the dehydration synthesis. They are added to OH and \(\mathrm{H}\) in hydrolysis. d. Electrons are transferred from monomers to \(\mathrm{H}\) and \(\mathrm{OH}\) ions in hydrolysis and from \(\mathrm{OH}\) and \(\mathrm{H}\) to monomers in dehydration synthesis.

What are the four types and functions of RNA? a. \(\mathrm{mRNA}\) is a single stranded transcript of DNA. rRNA is found in ribosomes. tRNA transfers specific amino acids to a developing protein strand. miRNA regulates the expression of mRNA strands. b. \(\mathrm{mRNA}\) is a single stranded transcript of rRNA. rRNA is translated in ribosomes to make proteins. tRNA transfers specific amino acids to a developing protein strand. microRNA (miRNA) regulates the expression of the mRNA strand. c. \(\mathrm{mRN}\) A regulates the expression of the miRNA strand. \(\mathrm{RNA}\) are found in ribosomes. tRNA transfers specific amino acids to a developing d. \(\mathrm{mRNA}\) is a single stranded transcript of DNA. rRNA transfers specific amino acids to a developing protein strand. tRNA is found in ribosomes. miRNA regulates the expression of the mRNA strand.

Which statement most accurately describes the importance of the condensation stage during Urey and Miller's experiment? a. Condensed water enabled the formation of monomers. b. Condensation and evaporation simulated lightning storms. c. Condensation and evaporation simulated the water cycle. d. Condensed water enabled the formation of polymers.
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