Molecular Basis of Inheritance · Question 148

In the genetic code dictionary, how many codons are used to code for all the 20 amino acids:

1. 64
2. 20
3. 60
4. 61

In a DNA percentage of thymine is 20% then what is the percentage of guanine : -

1. 40%
2. 20%
3. 30%
4. 60%

Transformation experiment was first performed on which bacterium : -

1. Diplococcus pneumoniae
2. Pasteurella pestis
3. E. coli
4. Salmonella

Jacob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for :

1. All prokaryotes and all eukaryotes
2. All prokaryotes and some protozoans
3. All prokaryotes
4. All prokaryotes and some eukaryotes

In E. coli, during lactose metabolism repressor binds to : -

1. Promoter gene
2. Operator gene
3. Structural gene
4. Regulator gene

Out of 64 codons, 61 codons code for 20 types of amino acids; it is called : -

1. Wobbling of codon
2. Universality of codons
3. Overlapping of gene
4. Degeneracy of genetic code

Which of the following reunites the exon segments after RNA splicing ?

1. RNA polymerase
2. RNA proteases
3. RNA primase
4. RNA ligase

Exon parts of mRNA have code for : -

1. Lipid
2. Protein
3. Phospholipid
4. Carbohydrate

m-RNA is synthesised on DNA template in which direction : -

1. Any
2. Both (3) and (4)
3. 5' → 3'
4. 3' → 5'

In Negative operon : -

1. cAMP has negative effect on lac operon
2. Co-repressor binds with inducer
3. Co-repressor binds with repressor
4. Co-repressor does not bind with repressor