Multiple Choice
Which functional group(s) are present in all standard amino acids?
20
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3. Amino Acids
Amino Acid Groups
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How many different amino acids are commonly found in proteins?
A
16
B
20
C
22
D
12
Verified step by step guidance1
Understand the question: The problem is asking about the number of different amino acids that are commonly found in proteins. These are the building blocks of proteins and are encoded by the genetic code.
Recall the concept: Proteins are made up of amino acids linked together in a specific sequence. There are 20 standard amino acids that are commonly found in proteins, which are encoded by the universal genetic code.
Note the exceptions: While there are 20 standard amino acids, two additional amino acids, selenocysteine and pyrrolysine, are sometimes considered as the 21st and 22nd amino acids. However, these are not as commonly found in proteins as the standard 20.
Eliminate incorrect options: From the given choices (16, 20, 22, 12), eliminate the numbers that do not correspond to the standard number of amino acids commonly found in proteins.
Select the correct answer: Based on the above reasoning, the correct answer is 20, as it represents the standard number of amino acids commonly found in proteins.
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