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751.

Lactose operon produces enzymesA. `beta`-galactosidase, permease and glycogen synthetaseB. `beta`-galactosidase, permease and transacetylaseC. permease, glycogen synthetase and transacetylaseD. `beta`-galactosidase, phosphoglucose, isomerase and permease

Answer» Correct Answer - B
Discussion
752.

Transfer of DNA from one bacteria to another by contact is known asA. conjugationB. transformationC. transductionD. transcription

Answer» Correct Answer - A
Discussion
753.

There was an article published in a -newspaper on DNA fingerprinting revealing procedure and its applications. Following terms were mentioned in this article : (i) Minisatellite (ii) Microsatellite Briefly mention about these terms.

Answer» (i) Minisatellites have sequences of approximately 15 to 50 base pairs and repeated tandemly upto thousands of times. There are about 30,000 minisatellites loci in the human genome. (ii) Microsatellites have base pairs of less than 10 and repeated usually 10 to 100 times. In himan genome, there are about 2,00,000 such satellite loci. These simple tandem repeats of short sequences are called VNTRs (variable number Tandem repeats).
Discussion
754.

(a) Describe the series of experiments of F. Griffith. Comment on the significance of the results obtained. (b) State the contribution of Macleod, McCarty and Avery.

Answer» Correct Answer - (a) and (b)
Discussion
755.

A burgler in a huff forgot to wipe off his blood strains from the place of crime where he was involved in a theft and fight. Which technique the crime branch personnel will use to help them identifying the burglar from the blood strains ?

Answer» DNA finger printing technique.
Discussion
756.

The experimental proof for semiconservative replication of DNA was first shown in aA. FungusB. BacteriumC. PlantD. Virus

Answer» Correct Answer - B
The experimental proof for semiconservative replication of DNA was first shown in a bacterium (E. coil).
Discussion