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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

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1.

A significant difference between prokaryotes and eukaryotes is :

  Prokaryote cells are not membrane-bound while eukaryote cells are.

  Prokaryotes do not have DNA as their genetic material while eukaryotes do.

  The DNA of prokaryotes floats freely around the cell while the DNA of eukaryotes is held within its nucleus.

  Prokaryotes do not have ribosomes while eukaryotes do.

  Half-n-half Clue
 

2.

The process of protein manufacture within ribosomes using mRNA is called :

  transcription

  protein derivation

  translation

  None of the above

  Half-n-half Clue
 

3.

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

  5

  3

  2

  4

  Half-n-half Clue
 

4.

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?

  2.44 %

  24.4 %

  42.4 %

  30.4 %

  Half-n-half Clue
 

5.

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

  A-C-A-G-C-C-G-T-A

  G-T-G-A-T-T-A-C-G

  T-G-T-C-G-G-C-A-T

  U-G-U-C-G-G-C-A-U

  Half-n-half Clue
 

6.

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

  amino acids

  nucleic acids

  nucleosides

  nucleotides

  Half-n-half Clue
 

7.

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

  1.8 meters.

  Varies from person to person.

  1.8 millimeters.

  1.8 centimeters.

  Half-n-half Clue
 


 
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