Q. No.
Which one of the following also acts as a catalyst in a bacterial cell?
1. sn RNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
1. sn RNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
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: | It was explained by Francois Jacob and Jacque Monod. |
The correct statements are:
| 1. | (b) and (c) |
| 2. | (a) and (c) |
| 3. | (b) and (d) |
| 4. | (a) and (b) |
The one aspect which is not a salient feature of genetic code, is its being:
1. degenerate
2. ambiguous
3. universal
4. specific
DNA or RNA segment tagged with a radioactive molecule is called:
| 1. | vector | 2. | probe |
| 3. | clone | 4. | plasmid |
Satellite DNA is a useful tool in:
1. Organ transplantation
2. Sex determination
3. Forensic science
4. Genetic engineering
Semiconservative replication of DNA was first demonstrated in:
1. Drosophila melanogaster
2. Escherichia coli
3. Streptococcus pneumoniae
4. Salmonella typhimurium
What is not true for genetic code?
1. A codon in mRNA is read in non-contiguous fashion
2. It is nearly universal
3. It is degenerate
4. It is unambiguous
| 1. | The total amount of purine nucleotides and pyrimidine nucleotides is not always equal |
| 2. | There are two strands, which run parallel in the 5' → 3’ direction |
| 3. | The proportion of adenine in relation to thymine varies with the organism |
| 4. | There are two strands, which run antiparallel - one in 5' → 3’ direction and the other in 3’→ 5’ |
1. GUU, GCU - Alanine
2. UAG, UGA - Stop
3. AUG, ACG - Start/methionine
4. UUA, UCA -Leucine
Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?
1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines
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