221. Mitochondria and chloroplast are
(A) semi-autonomous organelles
(B) formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery
Which one of the following options is correct?

A Both (A) and (B) are correct
B (B) is true but (A) is false
C (A) is true but (B) is false
D Both (A) and (B) are false
Answer :   (A) is true but (B) is false
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222. Which of the following is not found in DNA

A Adenine
B Cytosine
C Uracil
D Thymine
Answer :   Uracil
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223. Cell recognition and adhesion occur due to biochemicals of cell membranes named

A proteins
B lipids
C proteins and lipids
D glycoproteins and glycolipids
Answer :   glycoproteins and glycolipids
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224. Number of carbons in ring of deoxy ribose sugar is

A Four
B Five
C Six
D Three
Answer :   Five
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225. DNA is a genetic material was proved

A Griffith
B Linin Pauling
C Messelon and stahl
D Watson
Answer :   Griffith
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226. Prokaryotic genetic system contains

A DNA & histones
B RNA & histones
C Either DNA or hitsones
D DNA but no histones
Answer :   DNA but no histones
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227. E.R. is not related with

A Plamalaemma
B Golgbody
C Mitohondria
D Nucleus
Answer :   Mitohondria
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228. Why is a capsule advantageous to a bacterium?

A It allows the bacterium to attach to the surface
B It protects the bacterium from desiccation
C It provides means of locomotion
D It allows bacterium to "hide" from host's immune system
Answer :   It allows bacterium to "hide" from host's immune system
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229. T-tubules of muscles are modificatin of

A E. R.
B Golgibody
C Microtubules
D Microtilaments
Answer :   E. R.
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230. Eukaryotic chromosome different from prokaryotic

A RNA
B DRNA
C DNA and lipid
D DNA and histone
Answer :   DNA and histone
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