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Structure and chemical composition of DNA


This quiz is based on the physical structure and chemical composition of DNA. It deals with basic concepts related to DNA chemistry and DNA methods.
 

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Multiple choice

Your Performance  

1.

The unit within the nucleus that contains a protein complex (located at the center of the unit) of two H2A, H2B, H3 and H4 histone proteins with DNA wrapped around the complex in two turns, each turn consisting of about 80 base pairs is called a :

  ribosome

  histosome

  centrosome

  nucleosome

  Half-n-half Clue
 

2.

Melting of DNA is a standard method for preparing "single stranded DNA". A 4000 kb (kilobase- pair) DNA molecule melts at 79oC. What percent of the base pairs are GC pairs?

  30.4 %

  24.4 %

  42.4 %

  2.44 %

  Half-n-half Clue
 

3.

The number of hydrogen bonds that hold the Adenine - Thymine base pair together is :

  5

  2

  3

  4

  Half-n-half Clue
 

4.

A DNA strand has the sequence A-C-A-G-C-C-G-T-A. What would be its complementary strand ?

  T-G-T-C-G-G-C-A-T

  U-G-U-C-G-G-C-A-U

  G-T-G-A-T-T-A-C-G

  A-C-A-G-C-C-G-T-A

  Half-n-half Clue
 

5.

The three pyrimidine bases in DNA are :

  Adenine, Thymine and Guanine

  Cytosine,Thymine and Uracil

  Thymine, Guanine and Cytosine

  Adenine, Uracil and Guanine

  Half-n-half Clue
 

6.

The DNA molecule is a polymer. Its monomer units are :

  amino acids

  nucleotides

  nucleosides

  nucleic acids

  Half-n-half Clue
 

7.

The total length of a DNA molecule in the human genome when fully outstretched is approximately :

  Varies from person to person.

  1.8 centimeters.

  1.8 meters.

  1.8 millimeters.

  Half-n-half Clue
 


 
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