91Ó°ÊÓ

Amino acids usually exist in the form of Zwitter ions. This means that it consists of \(:\) |KCET 2000\\} (a) the basic group \(-\mathrm{NH}_{2}\) and the acidic group \(-\mathrm{COOH}\) (b) the basic group \(-\mathrm{NH}_{3}^{+}\)and the acidic group \(-\mathrm{CO}_{2}^{-}\) (c) the basic group \(-\mathrm{CO}_{2}^{-}\)and the acidic group \(-\mathrm{NH}_{3}^{*}\) (d) no acidic or basic group-

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution; it is : |KCET 2000| (a) an amino acid (b) a monosaccharide (c) a lipid (d) a protein

The base present in \(\mathrm{DNA}_{;}\)but not in RNA is : (a) guanine (b) adenine (c) uracil (d) thymine

The test used for identifying peptide linkage in proteins is : [KCET 2001] (a) Borsche's test (b) Molisch's test (c) Ninhydrin test (d) Biuret test

A sugar that is not a disaccharide among the following is : [KCET 2002] (a) galactose (b) lactose (c) maltose (d) sucrose

Vitamin \(\mathrm{B}_{6}\) is known as: (a) riboflavin (b) thiamine (c) lactose (d) pyridoxin

Heterocyclic amino acid among these compounds is: [KCET 2002] (a) lysine (b) tyrosine (c) proline (d) serine

Purine derivative among the following bases is : (a) cytosine (b) guanine (c) uracil (d) thymine

The process by which synthesis of protein takes place based on the genetic information present in \(m\)-RNA is called : \(\quad\) |KCET 2003| (a) translation (b) transcription (c) replication (d) messenger hypothesis

The tripeptide hormone present in most living cells is: |KCET 2003] (a) glutathione (b) glutamine (c) oxytocin (d) ptyalin