Multiple Choice
What type of covalent bond is formed when amino acids condense to form proteins?
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4. Protein Structure
Peptide Bond
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Which of the following best describes the function of a peptide bond in proteins?
A
It links amino acids together by forming a covalent bond between the carboxyl group of one amino acid and the amino group of another.
B
It transports oxygen within red blood cells.
C
It stores genetic information in the form of nucleotide sequences.
D
It catalyzes the hydrolysis of proteins into amino acids.
Verified step by step guidance1
Understand the structure of a peptide bond: A peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid through a condensation reaction, releasing a molecule of water (H2O).
Recognize the role of peptide bonds in proteins: Peptide bonds are responsible for linking amino acids together to form polypeptide chains, which fold into functional proteins.
Eliminate incorrect options: The peptide bond does not transport oxygen (this is the role of hemoglobin), store genetic information (this is the role of DNA/RNA), or catalyze hydrolysis (this is the role of enzymes like proteases).
Identify the correct function: The peptide bond's primary function is to link amino acids together in a protein by forming a covalent bond between the carboxyl group of one amino acid and the amino group of another.
Conclude that the correct answer is: 'It links amino acids together by forming a covalent bond between the carboxyl group of one amino acid and the amino group of another.'
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