Amino Acid Single Letter Code Quiz
Questions: 16 · 10 minutes
1. A sequence annotation changes an isoleucine residue to valine. Which replacement is correct in one-letter notation?
L→V
I→V
V→I
A→V
2. In a protein sequence, what amino acid does N represent?
Aspartate
Glutamine
Arginine
Asparagine
3. At one position, a variant replaces aspartate with glutamate. How should the one-letter code at that position change?
D to E
N to Q
E to Q
D to N
4. Which symbol completes the conversion tyrosine–glycine → _G?
W
T
F
Y
5. A substitution is written as K→R. Which amino acid change does this describe?
Glutamine to arginine
Lysine to arginine
Lysine to asparagine
Glutamate to arginine
6. Which one-letter code represents glutamine?
Q
E
N
G
7. A peptide is abbreviated APG. Which full amino acid sequence does it specify?
Alanine–phenylalanine–glycine
Arginine–proline–glutamate
Alanine–proline–glycine
Asparagine–proline–glutamine
8. How should the two-residue sequence asparagine–glutamine be written in one-letter notation?
DE
EQ
NQ
DQ
9. Which amino acid sequence is encoded by FVI?
Tyrosine–valine–leucine
Tryptophan–valine–isoleucine
Phenylalanine–tyrosine–leucine
Phenylalanine–valine–isoleucine
10. A sequence contains glycine, leucine, and tyrosine in that order. How is it written in one-letter notation?
ALY
GIT
GLY
GLF
11. What is the standard one-letter code for alanine?
L
A
N
I
12. A short segment is histidine–isoleucine–leucine. Which one-letter sequence is correct?
HLI
HIF
HIL
HVL
13. A protein sequence has W at a residue position. Which amino acid occurs there?
Threonine
Tryptophan
Phenylalanine
Proline
14. Which amino acid is represented by the one-letter code R?
Asparagine
Glutamine
Aspartate
Arginine
15. Which three-residue sequence is represented by MKT?
Methionine–lysine–threonine
Methionine–glutamine–threonine
Methionine–lysine–tryptophan
Methionine–glutamate–tyrosine
16. A peptide segment contains cysteine–proline–serine. Which one-letter sequence matches it?
CPS
CPT
GPS
CRS