Can you help me understand the problems I got wrong on my midterms The peptide L

Question

Can you help me understand the problems I got wrong on my midterms




The peptide Leu-Enkephaline is shown below. Use its structure to answer the following questions. 3. HH O CH CH, ol to ) How many amino acid residues make up the peptide? 2 pts) three b) How many chirality centers are present in leu-enkephalin? (2pts) one c) Draw a star next to the N-terminus of the peptide. (2 pts) / d) Draw the condensed structure of the side chain associated with the amino acid residue on the far to one v right of the peptide. (2 pts) 1.5 e) What is the biological role associated with Enkephalins? (2 pts)t n bone Stength

Explanation / Answer

3. For the given peptide structure,

a) Count the number of peptide bonds (-CO-NH-) linkages. We have a total of 4-linkage, that means we have

5 amino acid residues

b) Chiral center will have carbon connected to four different groups. In the given peptide we have,

3 chiral centers

c) N-terminus part of peptide is on far left.

2. For Melibiose

a. Monosaccaride are : Galactose and glucose

4. a. This is an deoxyribose nucleic acid structure.

b. Number of pyrimidines present = 2

5. For the given biological moelcule shown

b. hydrophilic part is oxygen rich and polar in nature. Thus the -CO-O is nudrophilic part. The carbon chain is non-polar and hydrophobic in nature.

c. Unsaturation in the chain leads to lower melting point. Thus the given moelcule will be low melting and exist as liquid.

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