alleryStart learning →How many types of amino acid are found in proteins?
ASixty four different types
BTwenty different types
CFour different types
DTen different types
Answer & Solution
Correct answer: B. Twenty different types
1. Every protein is a polymer built from amino acid monomers.
2. All proteins are made from different arrangements of the same 20 types of amino acid.
3. Ten of those 20 are essential in humans, which is a different count and a common confusion.
4. Four is the number of nitrogenous bases in DNA, and sixty four would point at codon combinations rather than amino acids.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.4 Proteins_
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