851. Cell was discovered by

A Robert Brown
B Mendel
C Robert Hooke
D Jagdish Chandra Bose
Answer :   Robert Hooke
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852. " Protoplasm is physical basis of life" was said by

A Huxley
B Purkinje
C Lamarck
D Hooke
Answer :   Huxley
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853. Variatiions in proteins are due to

A Sequence of amino acids
B Number of amino acids
C R-group
D None of the above
Answer :   Sequence of amino acids
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854. Which one of the following hydrolyses internal phosphodiester bonds in a polynucleotide chain

A Lipase
B Protease
C Exonuclease
D Endonuclease
Answer :   Endonuclease
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855. Oxysomes of F0-F1 particles occur on

A thylakoids
B mitochondrial surface
C inner mitochondrial membrane
D chloroplast surface
Answer :   inner mitochondrial membrane
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856. If the centromere is sub-median the two arms are unequal then the chromosome is called as

A Metacentric
B Submetacentric
C Acrocentric
D Telocentric
Answer :   Submetacentric
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857. Which of the following is not a mechanical cell organelle

A Glyoxysomes
B Centriole
C Diplosome
D Blepheroplast
Answer :   Glyoxysomes
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858. Ribosome attacherd with rough E.R. by the help of

A Protein
B Carbohydrate
C Glycoprotein (Ribbophorin)
D Phosphoprotein
Answer :   Glycoprotein (Ribbophorin)
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859. CDNA probes are copied from the messenger RNA molecules with the help of

A Restriction enzymes
B Reverse transcriptase
C DNA polymerase
D Adenosine deaminase
Answer :   Reverse transcriptase
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860. Which one is hexose sugar

A Mannose
B Galactose
C A and B both
D Cellulose
Answer :   A and B both
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