The chitinous exoskeleton of arthropods is formed by the polymerization of?

1. Keratine sulphate and chondroitin sulphate

2. D-glucosamine

3. N-acetyl glucosamine

4. Lipoglycans

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
 85%
NEET - 2015
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Which of the following biomolecules have a phosphodiester bond?

1. Fatty acids in a diglyceride

2. Monosaccharides in a polysaccharide

3. Amino acids in a polypeptide

4. Nucleic acids in a nucleotide

Subtopic:  Nucleic Acid |
 78%
From NCERT
NEET - 2015
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Which one of the following statements is incorrect?

1. A competitive inhibitor reacts reversibly with the enzyme to
form an enzyme inhibitor.
2. In competitive inhibition, the inhibitor molecule is not chemically
changed by the enzyme.
3. The competitive inhibitor does not affect the rate of breakdown
of the enzyme-substrate complex.
4. The presence of the competitive inhibitor decreases the km of
the enzyme for the substrate.

Subtopic:  Enzyme Inhibition: Introduction | Enzyme Inhibition |
NEET - 2015
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Select the option which is not correct with respect to enzyme action:
 

1. Substrate binds with the enzyme at its active site.
2. Addition of a lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate
3. A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate 
4. Malonate is a competitive inhibitor of succinic dehydrogenase

Subtopic:  Enzyme Inhibition: Introduction |
 74%
From NCERT
AIPMT - 2014
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Which one of the following is a non-reducing carbohydrate?

1. Maltose

2. Sucrose

3. Lactose

4. Ribose 5-phosphate

Subtopic:  Carbohydrates |
 82%
AIPMT - 2014
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A phosphoglyceride is always made up of:
1. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
2. a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
3. a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.
4. only a saturated fatty acid is esterified to a glycerol molecule to which a phosphate group is also attached.
Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
 63%
From NCERT
AIPMT - 2013
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The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins

Subtopic:  Enzyme Cofactors |
 70%
From NCERT
AIPMT - 2013
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Transition state structure of the substrate formed during an enzymatic reaction is:
1. permanent but unstable
2. transient and unstable
3. permanent and stable
4. transient but stable

Subtopic:  Mechanism of Enzymes |
 83%
From NCERT
AIPMT - 2013
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Macro molecule chitin is:

1. Phosphorus containing saccharide

2. Sulphur containing polysaccharide

3. Simple polysaccharide

4. Nitrogen-containing polysaccharide

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
 78%
AIPMT - 2013
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Uridine, present only in RNA is:
1. nucleoside
2. nucleotide
3. purine
4. pyrimidine
Subtopic:  Nucleic Acid: Nucleotides |
 58%
From NCERT
NEET - 2013
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