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Class 12 Chemistry
Biomolecules
Quiz 2
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The letter ‘D’ in carbohydrates signifies
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dextrorotatory
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configuration
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diamagnetic nature
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mode of synthesis
Explanation
configuration
A diabetic person carries a packet of glucose with him always, because
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glucose increases the blood sugar level slowly
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glucose reduces the blood sugar level
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glucose increases the blood sugar level almost instantaneously
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glucose reduces the blood sugar level slowly
Explanation
glucose increases the blood sugar level almost instantaneously
Among the naturally occurring carbohydrates, furanose ring is found in the
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Glucose unit of cane sugar
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Glucose unit of cellulose
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Fructose unit of cane sugar
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Galactose unit of lactose
Explanation
Fructose unit of cane sugar
Globular proteins are present in
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blood
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eggs
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milk
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all of these
Explanation
all of these
Which one of the amino acids can be synthesised in the body?
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Alanine
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Lysine
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Valine
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Histidine
Explanation
Alanine
Which of the following is not true about amino acids?
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They are constituents of all proteins
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Alanine having one amino and one carboxylic group
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Most naturally occurring amino acids have D-configuration
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Glycine is the only naturally occuring amino acid which is optically inactive.
Explanation
Most naturally occurring amino acids have D-configuration
A compound which contains both ………… and ………… is called amino acid. The amino acids is polypeptide chain are joined by ………/ bonds.
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amino, carboxylic group, ester
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amino, carboxylic group, peptide
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nitrogen, carbon, glycosidic
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hydroxy, carboxylic group, peptide
Explanation
amino, carboxylic group, peptide
Denaturation of protein leads to loss of its biological activity by
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formation of amino acids
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loss of primary structure
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loss of both primary and secondary structure
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loss of both secondary and tertiary structures
Explanation
loss of both secondary and tertiary structures
Proteins are condensation polymers of
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α-amino acids
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β-amino acids
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α-hydroxy acids
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β-hydroxy acids
Explanation
α-amino acids
Mark the wrong statement about denaturation of proteins
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The primary structure of the protein does not change
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Globular proteins are converted into fibrous proteins
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Fibrous proteins are converted into globular proteins
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The biological activity of the protein is destroyed
Explanation
Fibrous proteins are converted into globular proteins
In fibrous proteins, polypeptide chains are held together
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van der waals forces
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electrostatic forces of attraction
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hydrogen bonds
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covalent bonds
Explanation
hydrogen bonds
Which type of interactions are responsible for making the a-helix structure stable?
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Peptide bonds between -NH
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Hydrogen bonds between -NH of amino acid in the one turn with -CO of amino acid to adjacent turn
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-OH group of one amino acid with -CO group of other amino acid on the turn
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Hydrogen bonds between adjacent amino acids
Explanation
Hydrogen bonds between -NH of amino acid in the one turn with -CO of amino acid to adjacent turn
Which of the following is an acidic amino acid?
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Glycine
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Valine
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Leucine
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Glutamic acid
Explanation
Glutamic acid
The melting points of amino acids are higher than the corresponding hal-acids because
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amino acids exist as zwitter ions resulting in strong dipole-dipole attraction
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amino acids are optically active
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due to higher molecular mass of-NH
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they interact with water more than halo-acids and have salt like structure
Explanation
amino acids exist as zwitter ions resulting in strong dipole-dipole attraction
Most common types of secondary structures of proteins are
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a-helix and P-helix structures
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a-helix and P-pleated sheet structures
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right and left hand twisted structures
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globular and fibrous structures
Explanation
a-helix and P-pleated sheet structures
Mark the incorrect example
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Keratin and myosin-fibrous proteins
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Insulin and albumines-Globular proteins
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Glycylalanine-Djpeptide
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Enzymes and haemoglobin-Derived proteins
Explanation
Enzymes and haemoglobin-Derived proteins
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