MCQ on Purines: Structure, Biosynthesis and Functions

Purines are nitrogenous organic compounds that consist of a double-ring structure. They are essential components of DNA and RNA and play crucial roles in cellular processes. Common purines include adenine and guanine, which are involved in genetic information storage and various metabolic functions. This is an MCQ on Purines: Structure and Functions

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1. 
What class of organic compounds do purines belong to?

2. 
Which two nitrogenous bases in DNA are purines?

3. 
Purines are heterocyclic compounds. How many carbon atoms are present in the purine ring?

4. 
In RNA, what replaces thymine as a base paired with adenine?

5. 
Which enzyme is responsible for the conversion of guanine to xanthine in the purine catabolic pathway?

6. 
What is the end product of the breakdown of adenine in purine metabolism?

7. 
Which of the following is a purine-containing nucleotide?

8. 
In DNA, what type of bond connects the purine and pyrimidine base pairs?

9. 
Which of the following is not a purine base found in nucleic acids?

10. 
The degradation of purines produces which compound as a waste product?

11. 
Which genetic disorder is characterized by the accumulation of uric acid due to a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT)?

12. 
What is the primary function of the enzyme adenosine deaminase (ADA) in purine metabolism?

13. 
Which purine base is a precursor for the synthesis of both adenine and guanine?

14. 
Purines and pyrimidines are essential components of:

15. 
In purine metabolism, which enzyme is responsible for the conversion of xanthine to uric acid?

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