FAD is a coenzyme derived from

(1) riboflavin

(2) vitamin-B12

(3) thiamine

(4) niacin

Subtopic:  Enzyme Cofactors |
 53%
AIIMS - 2009
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Proteins are

(1) homopolymer

(2)heteropolymer

(3)homogenous mixture of amino acids

(4)heterogenous mixture of amino acids

 75%
From NCERT
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Amino acid is a:

(1) Substituted methane                   

(2) Substituted ethane

(3) Any acid having amino group       

(4) Derivative of indol acetic acid

Subtopic:  Introduction to Proteins |
 75%
From NCERT
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A. 

B.  

C. 

Which of the above is Zwitterionic form?

(1) B                    

(2) C                  

(3) A                  

(4) All are correct

Subtopic:  Zwitter ion & Peptide Bond |
 65%
From NCERT
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The quaternary structure of a protein:

(1) Consists of 4 subunits - hence the name quaternary

(2) Is unrelated to the function of the protein

(3) Both (a) and (b)

(4) Depends on the 1° structure of subunits

Subtopic:  Structural Organisation of Proteins |
From NCERT
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Adult human haemoglobin consists of:

(1) 2 subunits (β, β)                           

(2) 2 subunits (α, α)

(3) 4 subunits (2α, 2β)                      

(4) 3 subunits (2α, 1β)

Subtopic:  Structural Organisation of Proteins |
 91%
From NCERT
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Lecithin is:

(1) Phospholipid   

(2) Carbohydrate  

(3) Protein            

(4) Amino acid

Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
 93%
From NCERT
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The above diagram represent the nitrogenous bases. Identify the correct combination:

(1) A = Adenine; B = Thymine          

(2) A = Guanine; B = Thymine

(3) A = Adenine; B = Uracil               

(4) A = Guanine; B = Uracil

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 76%
From NCERT
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Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 84%
From NCERT
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Go through the following statements-
A. Primary metabolites are biochemicals formed as intermediates and products of normal vital metabolic pathways of organisms
B. Plant tissues produce only secondary metabolites
C. Secondary metabolites have restricted distribution in the plant kingdoms only.
D. Secondary metabolites are derivatives of primary metabolites.
E. Many plants, fungi and microbes synthesise secondary metabolites.
F. No secondary metabolite has ecological importance.
G. We understand the role of all secondary metabolites in the host organisms.
H. Many secondary metabolites are of economic importance to us.
Which of the above statement are wrong?
(1) A, B, C are wrong                               

(2) D, E, F are wrong

(3) A, D, E are wrong                               

(4) B, C, F, G are wrong

Subtopic:  Primary & Secondary Metabolites |
 72%
From NCERT
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