Q. No.Semiconservative replication of DNA was first demonstrated in
1. Salmonella typhimurium
2. Drosophila melangaster
3. Escherichia coli
4. Streptococcus pneumonia
1. Salmonella typhimurium
2. Drosophila melangaster
3. Escherichia coli
4. Streptococcus pneumonia
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Removal of introns and joining of exons in a defined order during transcription is called:
1. Looping
2. Inducing
3. Slicing
4. Splicing
The one aspect which is not a salient feature of genetic code, is its being
1. Ambiguous
2. Universal
3. Specific
4. Degenerate
Select the two correct statements out of the four (a-d) given below about lac operon :
| (a) | Glucose or galactose may bind with the repressor and inactivate it. |
| (b) | In the absence of lactose, the repressor binds with the operator region. |
| (c) | The z-gene codes for permease. |
| (d) | This was elucidated by Francois Jacob and Jacque Monod. |
The correct statements are :
| 1. | (a) and (c) | 2. | (b) and (d) |
| 3. | (a) and (b) | 4. | (b) and (c) |
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Satellite DNA is useful tool in
1. Sex determination
2. Forensic science
3. Genetic engineering
4. Organ transplantation
What are those structures that appear as beads-on-string in the chromosomes when viewed under an electron microscope?
| 1. | Genes | 2. | Nucleotides |
| 3. | Nucleosomes | 4. | Base pairs |
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Removal of RNA polymerase III from nucleoplasm will affect the synthesis of:
1. t-RNA
2. hn-RNA
3. m-RNA
4. r-RNA
Which one of the following is not a part of a transcription unit in DNA?
1. The inducer
2. A terminator
3. A promoter
4. The structural gene
Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component "X" in it.
Category Component
1. Cholesterol Guanin
2. Amino acid NH2
3. Nucleotide Adenine
4. Nucleoside Uracil
Which one of the following represents a palindromic sequence in DNA?
1. 5' - GAATTC - 3'
3' - CTTAAG - 5'
2. 5' - CCAATG - 3'
3' - GAATCC - 5'
3. 5' - CATTAG - 3'
3' - GATAAC - 5'
4. 5' - GATACC - 3'
3' - CCTAAG - 5'
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