Hershey and Chase experiment with bacteriophage showed that ______.

(a)

Protein gets into the bacterial cells

(b)

DNA is the genetic material

(c)

DNA contains radioactive sulphur

(d)

Viruses undergo transformation

DNA and RNA are similar with respect to _____.

(a)

Thymine as a nitrogen base

(b)

A single-stranded helix shape

(c)

Nucleotide containing sugars, nitrogen bases and phosphates

(d)

The same sequence of nucleotides for the amino acid phenyl alanine

A mRNA molecule is produced by _____.

(a)

Replication

(b)

Transcription

(c)

Duplication

(d)

Translation

The total number of nitrogenous bases in human genome is estimated to be about _____.

(a)

3.5 million

(b)

35000

(c)

35 million

(d)

3.1 billion

E. coli cell grown on ¹⁵N medium are transferred to ¹⁴N medium and allowed to grow for two generations. DNA extracted from these cells is ultracentrifuged in a cesium chloride density gradient. What density distribution of DNA would you expect in this experiment?

(a)

One high and one low density band

(b)

One intermediate density band.

(c)

One high and one intermediate density band.

(d)

One low and one intermediate density band