Q. No.While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering Chargaff’s rule it can be concluded that:
1.
it is a double-stranded circular DNA
2.
It is single-stranded DNA
3.
It is a double-stranded linear DNA
4.
No conclusion can be drawn
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A gene encoding for a polypeptide of 50 amino acids gets mutated at 25 codons UAU becoming UAA. The result would be:
| 1. | Polypeptide of 24 amino acid |
| 2. | Two polypeptides one with 24 amino acids and the second with 25 amino acids |
| 3. | A polypeptide with 49 amino acid |
| 4. | A polypeptide of 25 amino acids |
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During transcription, RNA polymerase binds to DNA site
| 1. | Regulator | 2. | Promoter |
| 3. | Enhancer | 4. | Receptor. |
Degeneration of genetic code is due to
1. First member of codons
2. Second member of codons
3. Third member of codons
4. Entire codons.
In genetic code dictionary, codons used to code for all the 20 essential amino acids are
1. 20
2. 60
3. 61
4. 64
In gene mutation, adenine is replaced by guanine. It is
1. Frame-shift mutation
2. Transcription
3. Transition
4. Transversion
In bacterial DNA replication, synthesis starting from the site of origin of replication
1. Involves RNA primers
2. Requires telomerase
3. Proceeds unidirectionally
4. Moves bidirectionally
DNA fingerprinting is related to:
| 1. | Molecular analysis of profiles of DNA samples |
| 2. | Analysis of DNA samples using imprinting devices |
| 3. | Techniques used for molecular analysis of different specimens of DNA |
| 4. | Techniques used in the identification of fingerprints of different persons |
A nutritionally wild-type organism that does not require additional biochemicals is:
| 1. | Prototroph | 2. | Auxotroph |
| 3. | Phenotype | 4. | Autotroph |
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