Multiple Choice
Which of the following correctly lists the three main types of carbohydrates?
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1. Introduction to Biochemistry
Carbohydrates
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Which of the following best describes the structures of carbohydrates?
A
They are composed of glycerol and fatty acids forming ester linkages.
B
They are polymers of nucleotides joined by phosphodiester bonds.
C
They are long chains of amino acids linked by peptide bonds.
D
They are polyhydroxy aldehydes or ketones, or compounds that yield such structures upon hydrolysis.
Verified step by step guidance1
Understand the definition of carbohydrates: Carbohydrates are organic molecules composed of carbon, hydrogen, and oxygen, typically in a ratio of 1:2:1. They are classified as polyhydroxy aldehydes or ketones, or compounds that yield such structures upon hydrolysis.
Compare the given options to the definition of carbohydrates: Analyze each option to determine if it matches the structural characteristics of carbohydrates.
Option 1: 'They are composed of glycerol and fatty acids forming ester linkages.' This describes lipids, not carbohydrates. Lipids are formed by esterification of glycerol and fatty acids.
Option 2: 'They are polymers of nucleotides joined by phosphodiester bonds.' This describes nucleic acids, such as DNA and RNA, not carbohydrates.
Option 3: 'They are long chains of amino acids linked by peptide bonds.' This describes proteins, not carbohydrates. Proteins are formed by peptide bonds between amino acids.
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