The length of E. coli DNA and length of DNA in a human 2N cell is:

(1) 1.36 mm and 2.2 m respectively  

(2) 1.36 mm and 2.2 mm respectively

(3) 1.3 ìm and 2.2 ìm respectively    

(4) 1.36 cm and 2.2 cm respectively

Escherichia coli cells were grown for many generations in ¹⁵NH₄Cl as sole nitrogen source. Subsequently, these cells were grown exactly for four generations in medium containing ¹⁴NH₄Cl. The DNA from these cells were isolated and separated. If ¹⁵N/¹⁵N represents the two strands of DNA where both strands have heavy nitrogen; ¹⁵N/¹⁴N as intermediate DNA; and ¹⁴N/¹⁴N as DNA containing light nitrogen, the ratios for heavy: intermediate: light DNA, respectively would be:

(1) 1 : 0 : 7         

(2) 1 : 1 : 6         

(3) 0 : 1 : 7          

(4) 0 : 8 : 0

Match each item in COLUMN I with one in COLUMN II and select your answer from the codes given:

Codes:
    A.    B.    C.     D.
1. c      a     d      b
2. c      a     b      d
3. a      b     c      d
4. a      c     d      b       

The base pairing in a double stranded DNA is correctly described as:

If each strand of a ds DNA acts as a template for new strand, the two daughter DNA will be:

In some viruses, the flow of genetic information is from RNA to DNA. These viruses are:

In prokaryotes:

Histones are rich in amino acids:

A typical nucleosome unit consists of about:

During DNA packaging in eukaryotic cells, Non Histone Chromosomal proteins: