The letter ‘D’ in carbohydrates signifies
  • dextrorotatory
  • configuration
  • diamagnetic nature
  • mode of synthesis
A diabetic person carries a packet of glucose with him always, because
  • glucose increases the blood sugar level slowly
  • glucose reduces the blood sugar level
  • glucose increases the blood sugar level almost instantaneously
  • glucose reduces the blood sugar level slowly
Among the naturally occurring carbohydrates, furanose ring is found in the
  • Glucose unit of cane sugar
  • Glucose unit of cellulose
  • Fructose unit of cane sugar
  • Galactose unit of lactose
Globular proteins are present in
  • blood
  • eggs
  • milk
  • all of these
Which one of the amino acids can be synthesised in the body?
  • Alanine
  • Lysine
  • Valine
  • Histidine
Which of the following is not true about amino acids?
  • They are constituents of all proteins
  • Alanine having one amino and one carboxylic group
  • Most naturally occurring amino acids have D-configuration
  • Glycine is the only naturally occuring amino acid which is optically inactive.
A compound which contains both ………… and ………… is called amino acid. The amino acids is polypeptide chain are joined by ………/ bonds.
  • amino, carboxylic group, ester
  • amino, carboxylic group, peptide
  • nitrogen, carbon, glycosidic
  • hydroxy, carboxylic group, peptide
Denaturation of protein leads to loss of its biological activity by
  • formation of amino acids
  • loss of primary structure
  • loss of both primary and secondary structure
  • loss of both secondary and tertiary structures
Proteins are condensation polymers of
  • α-amino acids
  • β-amino acids
  • α-hydroxy acids
  • β-hydroxy acids
Mark the wrong statement about denaturation of proteins
  • The primary structure of the protein does not change
  • Globular proteins are converted into fibrous proteins
  • Fibrous proteins are converted into globular proteins
  • The biological activity of the protein is destroyed
In fibrous proteins, polypeptide chains are held together
  • van der waals forces
  • electrostatic forces of attraction
  • hydrogen bonds
  • covalent bonds
Which type of interactions are responsible for making the a-helix structure stable?
  • Peptide bonds between -NH
  • Hydrogen bonds between -NH of amino acid in the one turn with -CO of amino acid to adjacent turn
  • -OH group of one amino acid with -CO group of other amino acid on the turn
  • Hydrogen bonds between adjacent amino acids
Which of the following is an acidic amino acid?
  • Glycine
  • Valine
  • Leucine
  • Glutamic acid
The melting points of amino acids are higher than the corresponding hal-acids because
  • amino acids exist as zwitter ions resulting in strong dipole-dipole attraction
  • amino acids are optically active
  • due to higher molecular mass of-NH
  • they interact with water more than halo-acids and have salt like structure
Most common types of secondary structures of proteins are
  • a-helix and P-helix structures
  • a-helix and P-pleated sheet structures
  • right and left hand twisted structures
  • globular and fibrous structures
Mark the incorrect example
  • Keratin and myosin-fibrous proteins
  • Insulin and albumines-Globular proteins
  • Glycylalanine-Djpeptide
  • Enzymes and haemoglobin-Derived proteins
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