NEET Zoology Proteins MCQ Question
Which combination of statements about protein structure is correct?
Proteins are linear chains of amino acids that do not exhibit any folding. The secondary structure can form multiple types of helices. Tertiary structure provides a 3-dimensional view of the protein. Right-handed helices are the only form observed in proteins.
The N-terminal amino acid is always at the end of the protein chain. The tertiary structure is essential for protein function. Proteins can exist as rigid rods. Secondary structures can include both left and right-handed helices.
Proteins exhibit various structural levels including primary, secondary, and tertiary. The secondary structure is characterized by the formation of helices. Tertiary structure involves the overall 3-dimensional folding of proteins. Only right-handed helices are found in proteins.
The C-terminal amino acid is the first amino acid in the protein chain. Proteins have a secondary structure that can be entirely helical. Tertiary structure is unimportant for protein functionality. Proteins always remain in a linear form.
Correct Answer
Detailed Explanation
Option C correctly identifies that proteins have multiple structural levels, including primary, secondary, and tertiary. It accurately states that the secondary structure can form helices, and highlights that only right-handed helices are observed in proteins, consistent with the NCERT context.
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