Question

#30,31,32,33,34 please

ADDITIONAL PROBLEMS 18.3 AMINO ACIDS 18.30 The amino acids in most biological systems are said to be a-L-acids. What does the prefix "a" mean? 18.31 What does the prefix "L" in a-L-acid mean? 18.38 18.32 What amino acids do the following abbreviations stand for? Draw the structure of each. (a) Ala (b) Cys (c) Asp 18.33 What amino acids do the following abbreviations stand for? Draw the structure of each. (a) Leu (b) Tyr (c) Asn 18.34 Name and draw the structures of the amino acids that fit these descriptions: (a) Contains a thiol group (b) Contains a phenol group 10.35 Name and draw the structures of the amino acids that fit these descriptions: (a) Contains an isopropyl group 18.39 Which (b) Contains a secondary alcohol group to pre At neutral pH, which of the following amino acids has a net positive charge, which has a net negative charge, and which is neutral? (a) NI La) Glutamine (b) Histidine 10 Methionine

Answer 1

mino acids in most biological system are said to d-lacios 1. The amino acids in mos What does the prefix ŕ mean? → The amino acids that makes up acides that makes up prolieins are all a-amino carlas. the carbon next to functional group ŕ called a-ca I-NH-R group's are attached to that carbon. > x- prefix is for the amine the amine group attach group attached to x-carbon. →-NHL OY - NH-R group's are 2. What does the prefix L in a - The Lamino acid → The amin el amino acid are normaly found in protien's . → There is a d & l nomenaclature which re nomenaclature which relext to direction plane polarised light rotated. e amine group of ' Ľ amino acid occures in Left hand side when drawn in fisher projection keeping carbazyne Acid group on top of carbon chain at bottom. e.g - COOH ç-H = L-amino acid. praw the structre of chy-OH 11 Ala - symbol of Alanine which is x-amino Acid 3 Hoe oH - alanine NH2 2) Cys- symbol of eysteine which is protinogenic amino acid 0 HS Үтон T NHh 3) Asp - symbol of Aspartic acid which is a amino acid Leu - Leucine i esential amino Acid noH NH Tyrosine noneesential Nth Ho Tyr r OH amino acid ETT HO Nth EUR7