Multiple Choice
In a standard amino acid (the building block of proteins), which set of functional groups is always present in the backbone structure?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
In standard genetically encoded proteins, how many different amino acids (protein monomers) are commonly used to build polypeptides?
A
10
B
4
C
64
D
20
Verified step by step guidance1
Understand that proteins are polymers made up of monomer units called amino acids.
Recall that the genetic code in standard organisms encodes for a specific set of amino acids used to build proteins.
Recognize that although there are many amino acids in nature, the standard genetic code specifies 20 different amino acids as the building blocks of proteins.
Note that the number 64 refers to the total number of codons (triplets of nucleotides) in the genetic code, not the number of amino acids.
Conclude that the commonly used number of amino acids in genetically encoded proteins is 20.
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