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Proteins

Proteins are ...

Question

Proteins are polymers of amino acids. Which of the following is not a protein?

A

wool

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B

nails

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C

hair

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D

DNA

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Solution

The correct option is B DNA
DNA is not a protein but is a nucleic acid. DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a polynucleotide. Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group.

Thus, the correct answer is option D.

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Similar questions

Q. Which one of the following amino acids is not found in proteins?

Q. Read the given paragraph and write answers of the following questions.
Protein is very essential for the growth, development and maintenance of living systems. Proteins are natural polymer of

α -

amino acids. A definite sequence of amino acids form a specific protein. Two or more than two amino acids bind to give peptide bond. Proteins are polypeptide, which loses its biological activity by physical or chemical changes.
(A) Explain essential and non-essential amino acid with example.
(B) Explain denaturation of protein.

STATEMENT-1 : All naturally occurring amino acids are not constituents of proteins.
STATEMENT-2 : Proline and hydroxyproline are imino acids, not amino acids.

Q. Proteins are digested into amino acids and fats into fatty acids. Which one of the following organs is responsible for absorption of fatty acids and amino acids?

Q. Which of the following enzyme(s) is/are responsible for the hydrolysis of proteins to amino acids?

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