Structure of DNA

Q.

A DNA from a particular species contain ${10}^8$ base pairs. What is the length of the DNA?

1. $3.4\times {10}^{-2}cm$

2. $3.4m$

3. $3.4cm$

4. $3.4\times {10}^{-2}m$

Q. A sugar-phosphate chain forms the backbone of a nucleic acid.

1. False
2. True

Q. Diameter of DNA is constant due to

1. Hydrogen bonds between base pairs
2. Phosphodiester bond
3. Disulphide bond
4. Covalent bonds

Q. DNA fragments are:

1. Positively charged
2. Negatively charged
3. Neutral
4. Either positively or negatively charged depending on their size

Q. Given below is a sample of portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it?
5'-GAATTC-3'
3'-CTTAAG-5'

1. Deletion mutation
2. Start codon at the 5' end
3. Palindromic sequence of base pairs
4. Replication completed