amino acids

Identify the amino acids containing nonpolar, aliphatic R groups.

• Phenylalanine, tyrosine, and tryptophan

• glycine, alanine, leucine

• lysine, histidine and arginine

• aspartate, glutamate

If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is?

• 6,0

• 5.96

• 5.97

• 6.02

Which of the following is a true statement?

• Aspartate is an essential amino acid

• Lysine is a non-essential amino acid

• Leucine is commonly used as an ingredient in the buffers of SDS page

• Tryptophan and tyrosine are significantly more polar than phenylalanine

The single letter symbol of aspartic acid is

• A

• C

• D

• E

Number of chiral centers in isoleucine is?

• 1

• 2

• 3

• 4

Which among the following is both glucogenic and ketogenic?

• leucine

• lysine

• histidine

• isoleucine

The amino acid commonly used as an ingredient in the buffer of SDS PAGE

• aspartic acid

• glycine

• glutamic acid

• histidine

Total number of protein building amino acids is

• 20

• 21

• 22

• 23

amino acids with aromatic side chains are

• proline, alanine , leucine

• tryptophan, proline, aspartate

• tryptophan, phenyl alanine, tyrosine

• tryptophan. tyrosine, alanine

The difference between amino acid and imino acid is

• bonding of carbonyl group with amide group

• bonding of nitrogen in the amide group

• bonding of nitrogen in the carboxyl group

• presence of covalent bond between amide and carbonyl group