Multiple Choice
To what does the term "polypeptide" refer?
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1. Introduction to Biochemistry
Proteins
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following statements best describes proteins?
A
Proteins are hydrophobic molecules that store genetic information.
B
Proteins are simple sugars that provide immediate energy to cells.
C
Proteins are inorganic molecules that function as cell membrane components.
D
Proteins are polymers composed of amino acid monomers linked by peptide bonds.
Verified step by step guidance1
Understand the definition of proteins: Proteins are macromolecules composed of amino acids, which are organic compounds containing both an amino group (-NH₂) and a carboxyl group (-COOH). These amino acids are linked together by peptide bonds to form polypeptide chains.
Recognize the role of proteins: Proteins perform a wide variety of functions in living organisms, including acting as enzymes, structural components, signaling molecules, and transporters. They are not hydrophobic molecules that store genetic information, nor are they simple sugars or inorganic molecules.
Clarify the incorrect options: Hydrophobic molecules that store genetic information refer to lipids or nucleic acids, not proteins. Simple sugars like glucose provide immediate energy, but they are carbohydrates, not proteins. Inorganic molecules are typically minerals or ions, not proteins.
Focus on the correct description: Proteins are polymers, meaning they are large molecules made up of repeating subunits (amino acids). These amino acids are linked by peptide bonds, which are formed through a dehydration reaction between the amino group of one amino acid and the carboxyl group of another.
Conclude with the correct statement: Proteins are polymers composed of amino acid monomers linked by peptide bonds, which is the accurate description of their structure and composition.
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