Multiple Choice
Which of the following amino acids would most likely be found on the surface of a protein?
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3. Amino Acids
Amino Acid Groups
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How many different standard amino acids are found in proteins?
A
12
B
20
C
22
D
16
Verified step by step guidance1
Understand the question: The problem is asking for the number of standard amino acids found in proteins. These are the building blocks of proteins and are encoded by the genetic code.
Recall the concept: Standard amino acids are the 20 amino acids that are universally used in protein synthesis across most organisms. These amino acids are encoded by codons in the genetic code.
Clarify the options: The options provided include 12, 20, 22, and 16. Among these, the correct number of standard amino acids is 20.
Note exceptions: While there are 20 standard amino acids, there are also two rare amino acids (selenocysteine and pyrrolysine) that are incorporated into proteins in specific cases, bringing the total to 22 in rare instances. However, these are not considered standard amino acids.
Conclude: The correct answer to the question is 20, as this is the universally accepted number of standard amino acids found in proteins.
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