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 

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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

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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

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Two free ribonuleotide units are interlinked with                                [1995]

(a) Peptide bond

(b) Covalent bond

(c) Hydrogen bond

(d) Phosphodiester bond

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Genes are packaged into a bacterial chromosome by                           [1997]

(a) Histones

(b) Basic proteins

(c) Acidic proteins

(d) Actin

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Lactose is composed of                      [1998]

(a) Glucose+Glucose

(b) Glucose+Fructose

(c) Fructose+Galactose

(d) Glucose+Galactose

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In which of the following groups, all the three are examples of polysaccharides?                        [1996]

(a) Starch, glycogen, cellulose

(b) Sucrose, maltose, glucose

(c) Glucose, fructose, lactose

(d) Galactose, starch, sucrose 

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Km value is dependent upon

(a) Temperature

(b) Substrate concentration

(c) Enzyme concentration

(d) All of the above

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Most abundant organic compound on earth is                     [2001,2004]

(a) Protein

(b) Cellulose

(c) Lipids

(d) Steroids

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