Role of DNA in heredity was discovered for the first time through experiments involving

(1)Transformation using E.coli

(2)Transduction involving bacteriophage

(3)The use of enzymes protease and nuclease

(4)Transformation using heat killed virulent and living non virulent S.pneumoniae

In 125 amino acids, sequence of the codon for 25th amino acid is mutated to UAA, then

(1)A polypeptide of 24 amino acids is formed

(2) A polypeptide of 124 amino acids is formed

(3) A polypeptide of 25 amino acids is formed

(4) No polypeptides are formed

If length of DNA is 1.36 mm , the number of base pair and nucleosomes in it will be

(1)4×10^12 and 2×10^4

(2)4×10^6 and 2×10^10

(3)4×10^6 and 2×10^4

(4) 4×10^6 and 2×10^12

If a codon consists of 3 bases and there are 5 different nitrogenous bases altogether. How many codons will be there?

(1)61

(2)125

(3)27

(4)64

If a DNA have 5000 bases , and amount of adenine is 15% then find out the number of nucleotide of guanine

(1)1750

(2)3500

(3)7000

(4)975

A codon consists of three nitrogenous bases and there are four kind of bases in nucleic acid altogether. How many codons will be there?

(1)60

(2)4³

(3)34

(4)46

The main enzyme for DNA replication is

(1)DNA-dependent RNA polymerase

(2) RNA-dependent DNA polymerase

(3) DNA-dependent DNA polymerase

(4) RNA-dependent RNA polymerase

The energy for the DNA replication comes from

(1)Deoxyribonucleosides triphosphates

(2) Deoxyribonucleotides triphosphates

(3) Deoxyribonucleosides

(4) phosphorylation of ATP

Which of the following is incorrect for DNA polymerase?

1. template dependent enzyme

2. highly efficient enzyme

3. high degree of accuracy

4. template independent enzyme

which of the following purposes are not served by Deoxyribonucleoside triphosphates

(1) act as substrate

(2)act as energy source for replication

(3)act as enzyme cofactors

(4)act same as ATP