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Basis of Molecular Inheritance
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Basis of Molecular Inheritance
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25 Questions

1. Which one of the following triplet codes - is correctly matched with its specificity for an amino acid in protein synthesis or as -—start-˜ or -—stop-˜codon? [2003]
2. 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]
3. Telomerase is an enzyme which is a
4. In which direction m-RNA synthesised on DNA template? [2001]
5. The basis for DNA fingerprinting is [1996]
6. Molecular basis of organ differentiation depends on the modulation in transcription by [2007]
7. During development of an organism - the product of one gene is required to activate another gene. Such gene products are called
8. T.O. Diener discovered a: [2009]
9. In a DNA percentage of thymine is 20% then what will be the percentage of guanine? [2002]
10. Jacob and Monod studied lactose metabolism in E.coli and proposed operon concept. Operon concept is applicable for [2002]
11. What base is responsible for hot spots for spontaneous point mutations? [1998]
12. The okazaki fragments in DNA chain growth [2007]
13. The following ratio is generally constant for a given species: [2004]
14. What does "lac" refer to in what we call the lac operon? [2003]
15. One function of the telomeres in a chromosome is to [2000]
16. Removal of introns and joining the exons in a defined order in a transcription unit is called: [2009]
17. 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]
18. A sequential expression of a set of human genes [2007]
19. How many base pairs (bp) are found in the haploid genome of humans? [1999]
20. In the genetic dictionary - there are 64 codons as [1990]
21. Out of A-T - G-C pairing - bases of DNA may exist in alternate valency state owing to arrangement called [1994]
22. Removal of RNA polymerase III from nucleoplasm will affect the synthesis of: [2012]
23. Crossing over that results in genetic recombination in higher organisms occurs between [2004]
24. Anticodon is an unpaired triplet of bases in an exposed position of [1995 - 2000]
25. What would happen if in a gene encoding a polypeptide of 50 amino acids - 25th codon (UAU) is mutated to UAA? [2003]

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