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How many peptide linkages does a hexapeptide have?

Correct Answer: 5
A hexapeptide is a compound formed by the combination of six same or different amino acids with the help of the amino and carboxyl groups. The six amino acids are connected by five peptide bonds.

Analysis of a hexapeptide using enzymatic cleavage reveals the following result:
• Amino acid composition of the peptide is: 2R, A, V, S, Y
• Trypsin digestion yields two fragments and the compositions are: (R, A, V) and (R, S, Y)
• Chymotrypsin digestion yields two fragments and the compositions are: (A, R, V, Y) and (R, S)
• Digestion with carboxypeptidase A yields no cleavage product.
Given: Trypsin cleaves at carboxyl side of R. Chymotrypsin cleaves at carboxyl side of Y. Carboxypeptidase A cleaves at amino side of the C-terminal amino acid (except R and K) of the peptide.
The correct amino acid sequence of the peptide is:

More complex carbohydrates occur in nature when 2 or more simple sugars are linked altogether. In nature, the linkages are _________ linkages, that’s, acetal or ketal bonds involving the anomeric carbon of just one of the monosaccharides involved. These bonds are called _________ linkages.

Which is the correct order of activities showcased by exogenous pathway? i) Generation of MHC class II molecules ii) MHC-peptide transport iii) Class II MHC peptide loading iv) Generation of Peptide from proteolysis

The percentage SIMILARITIES and IDENTITIES, respectively, between the two peptide sequences given below will be . . . . . . . . % and . . . . . . . . %.
Peptide I: Ala-Ala-Arg-Arg-Gln-Trp-Leu-Thr-Phe-Thr-Lys-Ile-Met-Ser-Glu
Peptide II: Ala-Ala-Arg-Glu-Gln-Tyr-Ile-Ser-Phe-Thr-Lys-Ile-Met-Arg-Asp

The reaction given by two or more peptide linkages is?

A, B, C, D and E play a game of cards. A says to B, "If you give me 3 cards, you will have as many as I have at this moment while if D takes 5 cards from you, he will have as many as E has." A and C together have twice as many cards as E has. B and D together also have the same number of cards as A and C taken together. If together they have 150 cards, how many cards has C got ?

The peptide group in a protein has a rigid, planar structure. Which interactions give the peptide bond its partial double bond character?

The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of which among the following residue?

A coiled peptide chain held in place by hydrogen bonding between peptide bonds in the same chain is?

Which is the correct order of activities showcased by endogenous antigens? i) Peptide binding to MHC Class I ii) Transport to Endoplasmic Reticulum iii) Generation of Peptide from proteolysis