MCQ on DNA Structure and Functions







DNA (Deoxyribonucleic Acid) is a molecule that carries genetic information in living organisms. It consists of a double helix structure made up of nucleotides containing four bases: adenine (A), thymine (T), cytosine (C), and guanine (G). DNA serves as a blueprint for the development, functioning, and reproduction of cells and organisms. This is an MCQ on DNA structure and functions.

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1. 
What does DNA stand for?

2. 
What is the shape of the DNA molecule as described by James Watson and Francis Crick?

3. 
What are the four nitrogenous bases found in DNA?

4. 
DNA replication occurs during which phase of the cell cycle?

5. 
Which enzyme is responsible for unwinding the DNA double helix during replication?

6. 
In DNA, adenine (A) always pairs with:

7. 
What is the function of DNA polymerase during DNA replication?

8. 
Which of the following is not a component of a nucleotide in DNA?

9. 
In eukaryotic cells, where is the majority of the DNA located?

10. 
What is the central dogma of molecular biology?

11. 
Which nitrogenous base is found in RNA but not in DNA?

12. 
In eukaryotes, DNA is organized into structural units called:

13. 
What is the purpose of DNA replication in a cell?

14. 
Which type of bond holds the complementary nitrogenous bases together in the DNA double helix?

15. 
What is the role of topoisomerase in DNA replication?

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MCQ on DNA Structure







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