251. Cell organelles can be separated by method of

A Autoradiography
B Microtomy
C Differential centrifugation
D X-ray differaction
Answer :   Differential centrifugation
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252. Which substance is not carbohyddrate

A Starch
B Glycogen
C Wax
D Glucose
Answer :   Wax
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253. Which structure is present in Chromosomes

A Nucleus
B Centromere
C Chromomer
D Centromere
Answer :   Centromere
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254. One turn of the helix in a B-form DNA is approximately

A 20 nm
B 0.34 nm
C 3.4 nm
D 2 nm
Answer :   3.4 nm
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255. According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

A Proteins in cell membranes can travel within the lipid bilayer
B Proteins can also undergo flip-flop movements in the lipid bilayer
C Proteins can remain confined within certain domains of the membrane
D Many proteins remain completely embedded within the lipid bilayer
Answer :   Proteins can also undergo flip-flop movements in the lipid bilayer
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256. Quantity of nucleic acids in animal cells is

A 2 %
B 5%
C 10
D 15%
Answer :   2 %
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257. DNA acts as a template for synthesis of

A RNA
B DNA
C A and B both
D Protein
Answer :   A and B both
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258. Carriers of genetic information are

A T-RNA
B DNA
C M-RNA
D Nucleoproteins
Answer :   DNA
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259. Who first proved that heredity is controlled by nucleus

A Strasburger
B Hammerlilng
C Mendel
D Hugo de veries
Answer :   Hammerlilng
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260. " new cells arise from pre-existing cell" is statement of

A Max Schultze
B R. Virchow
C Altmann
D Purkinje
Answer :   R. Virchow
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