GOB Chemistry
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Cysteine and methionine are both sulfur-containing amino acids. However, the side chain of cysteine is polar, while the side chain of methionine is nonpolar. Write the structures of the two dipeptides produced using these two amino acids and indicate the peptide bond in each.
Oxytocin is a neuropeptide hormone that has nine amino acids. Determine the number of peptide bonds present in oxytocin.
Provide two dipeptides, using structural formulas, that contain proline and serine.
Which of the following dipeptides and tripeptides are correctly paired with their corresponding 1-letter abbreviations?
I. Arg-Ser: R-S
II. Glu-Asn-Gly: Q-N-G
III. Pro-Asp-Tyr: P-D-Y
IV. Met-Lys: M-L
V. Leu-Cys-Val: L-C-V
i. Draw the line-angle structure for glycylserine.
ii. Give its three-letter abbreviation.
iii. Give its one-letter abbreviation.
(Ignore stereochemistry)
i. Provide the line-angle structure for valylglycylserine.
i. Draw the line-angle structure for isoleucylglutamine.
ii. Provide its three-letter abbreviation.
iii. Provide its one-letter abbreviation.
i. Show the line-angle structure for isoleucylthreonylserinylphenylalanine.
ii. Provide its three-letter abbreviation
Draw the structure for the peptide Lys–Phe–Asp and write the one-letter abbreviation. (Ignore stereochemistry)
Draw the structure for the peptide Gln–Ser–Leu–Lys–Thr and write the one-letter abbreviation. (Ignore stereochemistry)
Given the amino acids valine (Val), isoleucine (Ile), and leucine (Leu), which of the following is NOT a valid tripeptide sequence using the three-letter abbreviations for the amino acids?
Provide the skeletal structure for the peptide Lys—Met—Phe. (Ignore stereochemistry)
Provide the skeletal formula for the peptide Thr—Asp. (Ignore stereochemistry)
Give the skeletal structure for the peptide IYQ. (Ignore stereochemistry)