This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
DNA polymerase are required for 
Select and explain. 
A. 5 – 3 polymerase activity, B. 3 – 5  exonuclease activity, C. 5 – 3  exonuclease activity, D. All of these
D: All of these
Answer: D: All of these 
Explanation: As the question has not specified the type of DNA polymerase whether type I, II & III, So, consider all three & lets have a look of the properties of all 3:-


DNA polymerase I  5' → 3' polymerase activity
	                             5' → 3' exonuclease activity
	                             3' → 5' exonuclease activity


DNA polymerase II   Proofreading, DNA repair
DNA polymerase III 5' → 3' polymerase activity
                              3'→ 5' exonuclease