Chemistry Macromolecules / Biochemistry MDCAT 2011
PMDC Verified Question 45 of 47
A polymer in which the number of amino acid residue is greater than 100 or the molecular mass is greater than 10,000 is called
A
Polypeptide
B
Tripeptide
C
Dipeptide
D
Protein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Protein
Concept:

Amino acids polymerize via peptide bonds. The nomenclature (peptide vs. protein) depends on the length of the chain and molecular weight.

Formula:

$$N/A$$

Solution:

  • A dipeptide has 2 amino acids, a tripeptide has 3, and a polypeptide typically has up to 100 amino acids.
  • By biochemical definition, a macromolecule with more than 100 amino acid residues or a molecular mass exceeding 10,000 Daltons (10 kDa) is officially termed a protein.


Why other options are incorrect:

A polypeptide refers to chains shorter than 100 amino acids. Dipeptides and tripeptides consist of only 2 and 3 amino acids, respectively.

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