741. Mitochondrial cristae are sites of

A breakdown of macromolecules
B protein synthesis
C phosphorylation of flavoproteins
D oxidation-reduction reactions
Answer :   oxidation-reduction reactions
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742. The direction of D.N.A. replications is

A From 5’ end towards 3’ end
B From 3’ end towards 5’ end
C Amino terminus to carboxy terminus
D Carboxy terminus to amino terminus
Answer :   From 5’ end towards 3’ end
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743. Which of the following diasaccharide gives two molecules of glucose on hydrolysis

A Maltose
B Lactose
C A and B both
D Sucrose
Answer :   Maltose
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744. In DNA purine nitrogen bases are

A Uracil and Guanine
B Guanine and Adenine
C Adenine and cytosine
D None of the above
Answer :   Guanine and Adenine
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745. Knife of DNA is

A DNA ligase
B Restriction endonuclease
C Exonuclease
D Peptidase
Answer :   Restriction endonuclease
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746. Long chain molecuels of fattey acids are formed

A Polymerisation of 2 carbon compounds
B Decoposition of fats
C Polymeristaion of glycogen
D Conversion of glycogen
Answer :   Polymerisation of 2 carbon compounds
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747. 64Codons contitute gentic code because

A There was 64 types of amino acid
B 64 types of t-RNA
C Genetic code is triplet
D There are 64 enzymes
Answer :   Genetic code is triplet
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748. Light compound microscope with 15 x eye piece lense and 45 x objective lense will have a magnification of

A 2000
B 675
C 1000
D 500
Answer :   675
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749. Cellular organelles with membranes are :

A chormosomes, ribosomes and endoplasmic reticulum
B endoplasmic reticulum, ribosomes and nuclei
C lysosomes, Golgi apparatus and mitochondria
D nuclei, ribosomes and mitochondria
Answer :   lysosomes, Golgi apparatus and mitochondria
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750. During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called

A CAAT box
B CGTT box
C AAAT box
D TATA box
Answer :   TATA box
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