Identify the incorrect statement regarding the structure of proteins:

1. They are heteropolymers containing strings of amino acids.

2. The first amino acid in the primary structure is the N-terminus amino acid

3. Only left helices are observed in proteins

4. Tertiary structure is absolutely essential for many biologic functions of the proteins

Subtopic:  Structural Organisation of Proteins |
 87%
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At each step of its ascent, the DNA strand turns:

1. 3.4°

2. 34°

4. 3.6°

4. 36°

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 59%
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The blood concentration [in mM] of glucose in a normal healthy individual is:

1.  4.5-5.0

2.  5.0-5.5

3.  5.5-6.0

4.  6.0-6.5

 74%
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The substrate has to go through a much higher energy state or transition state in case of:

1. Exothermic reactions only

2. Endothermic reactions only

3. Both exothermic and endothermic reactions

4. Neither exothermic nor endothermic reactions

Subtopic:  Mechanism of Enzymes |
 64%
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When the co-factor is removed from the enzyme, the catalytic activity:

1. is lost.

2. is reduced.

3. is increased.

4. is unaffected.

Subtopic:  Enzyme Cofactors |
 78%
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Subtopic:  Primary & Secondary Metabolites |
 69%
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The tail of the phospholipid molecule:

1. is hydrophilic and composed of phosphate

2. is hydrophilic and composed of saturated hydrocarbons

3. is hydrophobic and composed of saturated hydrocarbons

4. is hydrophobic and composed of unsaturated hydrocarbons

Subtopic:  Cell Membrane |
 65%
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In animal cells, lipid-like steroidal hormones are synthesized in the:

1. Nucleus

2. Rough endoplasmic reticulum

3. Smooth endoplasmic reticulum

4. Golgi apparatus

Subtopic:  Endomembrane System (Endoplasmic Reticulum) |
 90%
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Lignin is a component of the secondary walls of:-

1. Epidermis

2. Collenchyma

3. Sclerenchyma

4. Parenchyma

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
 84%
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Given below is the graph showing the effect of substrate concentration on enzyme activity. In the presence of a competitive inhibitor, when the concentration of the substrate is progressively increased :

1. The Km value is increased but the reaction will not achieve Vmax

2. The Km value is increased but the reaction can ultimately achieve Vmax

3. The Km value is decreased but the reaction will not achieve Vmax

4. The Km value is decreased but the reaction can ultimately achieve Vmax

Subtopic:  Enzyme Inhibition |
 64%
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