DNA Structure

In DNA double helix, the two DNA chains are held together by

• 
  covalent bonds between the pair of bases

• 
  hydrogen bonds between the pair of bases

• 
  ionic bonds between the pair of bases

• none of the above

The 5' and 3' numbers are related to the

• length of the DNA strand

• carbon number in sugar

• the number of phosphates

• the base pair rule

The most common liquid volumes in molecular biology are measured in

• 
  ml

• 
  μl

• nl

• 1

In DNA, there are

• 
  five bases known as adenine, guanine, thymine, tryptophan and cytosine

• four bases known as adenine, guanine, thymine and cytosine

• three bases known as adenine, guanine and cytosine

• 
  only two bases known as adenine and cytosine

When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?

• 
  Phosphate

• 
  Cytosine

• 
  Uracil

• Guanine

Telomeres are usually rich in which nucleotide?

• 
  Adenine

• Guanine

• Cytosine

• 
  Thymine

Which is the largest among the followings?

• Nucleotide

• Nitrogenous base

• Phosphate

• 
  Carbon

The chromosomal DNA complexes with

• 
  three types of histone as H1, H2A and H4

• 
  five types of histone as H1, H2A, H2B, H3 and H4

• four types of histone as H1, H2A, H3 and H4

• two types of histone as H1 and H4

DNAs when charged, migrate in a gel towards the

• 
  positive pole

• 
  negative pole

• will not migrate

• none of these

What is the approximate size (in kb) of the E. coli genome?

• 3000 kilobase

• 4500 kilobase

• 5500 kilobase

• 
  6500 kilobase