Regarding various levels of protein structure, which of the following is not true?
 
1. The positional information of amino acids in a protein is called the primary structure.
2. Alpha helix is a secondary structure and beta pleated sheet is a tertiary structure of a protein.
3. Tertiary structure is absolutely necessary for the many biological activities of proteins.
4. Quaternary structures are seen in proteins made of more than one polypeptide chain.
Subtopic:  Proteins |
 87%
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In a typical cell, which of the following constitutes least % of the total cellular mass?

1. Proteins 2. Nucleic acids
3. Carbohydrates 4. Lipids
Subtopic:  Primary & Secondary Metabolites |
 72%

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Regarding RuBisCO:

I:  It is the most abundant protein in the whole of the biosphere.
II:  Mg2+ is its activator
 
1. Only I is correct
2.  Only II is correct
3. Both I and II are correct
4.  Both I and II are incorrect
Subtopic:  Proteins |
 78%
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The unique properties of each amino acid is determined by its particular:
1. R group
2. amino group
3. kinds of peptide bond
4. number of bonds to other amino acids

Subtopic:  Amino Acids |
 88%

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Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?

1. Ester bonds 2. Hydrogen bonds
3. Electrostatic interaction 4. Hydrophobic interaction
Subtopic:  Proteins |

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The essential chemical components of many coenzymes are:

1. Nucleic acid 2. Carbohydrates
3. Vitamins 4. Proteins

Subtopic:  Enzyme Cofactors |
 85%
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Regarding factors affecting enzyme activity:
 
I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity.
II: With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first.
 
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 87%
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Even in the presence of malonate, the velocity of the reaction catalyzed by the enzyme succinic dehydrogenase can be increased by:
1. increasing the temperature beyond 400C
2. decreasing the pH
3. increasing the concentration of succinate
4. decreasing the production of ATP by chemiosmosis

Subtopic:  Mechanism of Enzymes |
 86%

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Identify the incorrectly matched pair:

1. Lecithin Phospholipid
2. Aromatic amino acid Threonine
3. Cytidine Nucleoside
4. Trihydroxy propane Glycerol
Subtopic:  Amino Acids |
 82%

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
Assertion (A): Lipids are macromolecules
Reason (R): They have a molecular weight range of ten thousand Daltons and above.
In the light of the above statements choose the correct answer from the options given below:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Element Analysis |
From NCERT
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