Determine whether each of the following statements describes the primary, second
ID: 70831 • Letter: D
Question
Determine whether each of the following statements describes the primary, secondary, tertiary, or quaternary structure of a protein.
A. Peptide bonds join amino acids in a polypeptide chain.
Check all that apply.
primary protein structure
secondary protein structure
tetriary protein structure
quaternary protein structure
B. Two polypeptide chains are held together by hydrogen bonds.
Check all that apply.
primary protein structure
secondary protein structure
tetriary protein structure
quaternary protein structure
C. Hydrogen bonding between amino acids in the same polypeptide gives a coiled shape to the protein.
Check all that apply.
primary protein structure
secondary protein structure
tetriary protein structure
quaternary protein structure
Explanation / Answer
Answer A: Primary structure.
It comprises of the chain of amino acids linked together with the help of peptide bond. This bond is formed between -COOH group of one amino acid and -NH2 group of the other, followed by removal of water molecules.
Answer B: Quaternary protein structure
When there are more than one polypeptide chain, it makes the 4th level of protein structure. That's why its quaternary structure.
Answer C: Secondary protein structure
When amino acids of same chain form bonds they make the structures like beta chains or alpha helices. And these are all secondary structures.
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