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Basis of Molecular Inheritance
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Basis of Molecular Inheritance
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25 Questions

1. During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and [2004]
2. E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because: [2005]
3. Select the two correct statements out of the four (a-“d) given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it (ii) In the absence of lactose the repressor binds with the operator region (iii) The z-gene codes for permease (iv) This was elucidated by Francois Jacob and Jacque Monod The correct statements are: [2010]
4. In a mutational event - when adenine is replaced by guanine - it is a case of [2004]
5. The telomeres of eukaryotic chromosomes consist of short sequences of [2004]
6. Frequency of an allele in a isolated population may change due to [2001]
7. The basis for DNA fingerprinting is [1996]
8. Telomerase is an enzyme which is a
9. Transformation experiment was first performed on which bacteria? [2002]
10. Satellite DNA is useful tool in: [2010]
11. Okazaki fragments are seen during [1996]
12. Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have [1992]
13. The one aspect which is not a salient feature of genetic code - is its being: [2010]
14. In the genetic code dictionary - how many codons are used to code for all the 20 essential amino acids? [2003]
15. Three codons causing chain termination are [1997]
16. Crossing over that results in genetic recombination in higher organisms occurs between [2004]
17. Nucleotide arrangement in DNA can be seen by [1993]
18. In negative operon [2001]
19. 70. DNA fingerprinting refers to [2004]
20. Protein synthesis occurs [2000]
21. During transcription - RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure - what is it-˜s DNA-binding sequence? [2007]
22. In split genes - the coding sequences are called
23. How many base pairs (bp) are found in the haploid genome of humans? [1999]
24. In eukaryotes - after transcription of mRNA - some of its nucleotides are removed before it is translated into polypeptide. The nucleotides which are removed from mRNA are called
25. In a DNA percentage of thymine is 20% then what will be the percentage of guanine? [2002]

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