Which two amino acids differ from each other by only the identity of one atom? A

Question

Which two amino acids differ from each other by only the identity of one atom? Ala and Ser Asp and Asn Leu and lie Ser and Cys Ser and Thr The peptide alanyl-glutamyl-glycol-alanyl-leucine: has a disulfide bridge, has four peptide bonds, is encoded by 12 bp of DNA. no free amino groups, one free carboxyl group. Which functional group is characteristic of the last amino acid in a peptide chain, and which AA side chain shares this group. amino - arginine. amino - lysine. carboxyl - glutamic acid. hydroxyl - serine. thiol - cysteine.

Explanation / Answer

1.D

OH group of serine replaced with SH group group in cysteine.

2. B

Has four peptide bonds, amino acid linked togeather by peptide bond. other statement are not correct. like disulphide bond can not present in primary structure, it have Free N and C terminal and encoded by 15bp not 12.

3. C

Corboxyl of glutamic acid which will make the last amino acid in c-terminal.

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