Multiple Choice
What determines the order of amino acids in the primary structure of a protein?
20
views
3. Amino Acids
Amino Acid Groups
Struggling with Biochemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following functional groups is found in all standard amino acids?
A
Amino group (\(-NH_2\))
B
Methyl group (\(-CH_3\))
C
Sulfhydryl group (\(-SH\))
D
Phosphate group (\(-PO_4^{2-}\))
Verified step by step guidance1
Step 1: Understand the structure of standard amino acids. All standard amino acids share a common backbone structure consisting of a central carbon atom (the alpha carbon) bonded to four groups: an amino group (
), a carboxyl group (
), a hydrogen atom, and a variable side chain (R group).
Step 2: Analyze the functional groups listed in the question. The amino group (
) is part of the backbone structure of all standard amino acids. The other groups listed (methyl group, sulfhydryl group, and phosphate group) are not universally present in all amino acids.
Step 3: Recall that the methyl group (
) is found in specific amino acids like alanine, but not in all amino acids. Similarly, the sulfhydryl group (
) is unique to cysteine, and the phosphate group (
) is not a component of standard amino acids.
Step 4: Confirm that the amino group (
) is universally present in all standard amino acids, as it is essential for forming peptide bonds during protein synthesis.
Step 5: Conclude that the correct answer is the amino group (
), as it is the functional group found in all standard amino acids.
Related Videos
Related Practice
Amino Acid Groups practice set
Problem sets built by lead tutorsExpert video explanations