Cytochrome is                          [2001]

(a) Metallo flavoproteins

(b) Fe containing porphyrin pigment

(c) Glycoprotein

(d) Lipid 

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The most abundant element present in plants is                               [2004]

(a) Carbon

(b) Nitrogen

(c) Manganese

(d) Iron

Concept Questions :-

Element Analysis
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Transition state structure of the substrate formed during an enzymatic reaction is                                                                                                                                                                [2013]

(a) Transient but stable

(b) Permanent but unstable

(c) Transient but unstable

(d) Permanent and stable

Concept Questions :-

Enzyme Catalysis
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Which one of the following is a non-reducing carbohydrate?                                [2014]

(a) Maltose

(b) Sucrose

(c) Lactose

(d) Ribose-5-phosphate

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Antiparallel strands of a DNA molecule means that                      [2006]

(a) The phosphate groups of two DNA strands, at their ends, share the same position

(b) The phosphate groups at the start of two DNA strands are in opposite position (pole)

(c) One strand turns clockwise

(d) One strand turns anti-clockwise 

Concept Questions :-

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In the DNA molecule                 [2008]

(a) The total amount of purine nucleotides and pyrimidine nucleotides is not always equal

(b) There are two strands which run parallel in 5'3' direction

(c) The proportion of adenine in relation to thymine varies with the organism

(d) There are two strands which run antiparallel one in 5'3' direction and other in 3'5' direction 

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The major portion of the dry weight of plants comprises of                  [2003]

(a) Carbon, nitrogen and sulphur

(b) Carbon, nitrogen and oxygen

(c) Nitrogen, phosphorous and potassium

(d) Calcium, magnesium and sulphur

Concept Questions :-

Element Analysis
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Select the option which is not correct with respect to enzyme action.                             [2014]

(a) Substrate binds with enzyme as its active site

(b) Addition of lot of succinate does not reverse the inhibition of succinic dehydogenase by malonate.

(c) A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate

(d) Malonate is a competitive inhibitor of succinic dehydrogenase

Concept Questions :-

Factors Affecting Enzyme Catalysis Reaction
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Two free ribonuleotide units are interlinked with                                [1995]

(a) Peptide bond

(b) Covalent bond

(c) Hydrogen bond

(d) Phosphodiester bond

Concept Questions :-

Please attempt this question first.

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Genes are packaged into a bacterial chromosome by                           [1997]

(a) Histones

(b) Basic proteins

(c) Acidic proteins

(d) Actin

Concept Questions :-

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