Multiple Choice
How many kilocalories are provided by 1 gram of fat?
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1. Introduction to Biochemistry
Lipids
Multiple Choice
Which two types of macromolecules are the main components of the myelin sheath?
A
Lipids and carbohydrates
B
Proteins and nucleic acids
C
Carbohydrates and nucleic acids
D
Lipids and proteins
Verified step by step guidance1
Step 1: Understand the structure and function of the myelin sheath. The myelin sheath is a protective layer that surrounds the axons of neurons, facilitating the rapid transmission of electrical signals in the nervous system.
Step 2: Recall the main components of the myelin sheath. The myelin sheath is primarily composed of lipids, which provide insulation, and proteins, which contribute to its structural integrity and function.
Step 3: Eliminate incorrect options based on the known composition of the myelin sheath. Carbohydrates and nucleic acids are not major components of the myelin sheath.
Step 4: Confirm that lipids and proteins are the correct answer. Lipids, such as phospholipids and cholesterol, form the bulk of the sheath, while proteins like myelin basic protein (MBP) play a role in its structure and stability.
Step 5: Conclude that the correct answer is 'Lipids and proteins,' as these are the two macromolecules that make up the myelin sheath.
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