Question

The function of DNA polymerase is
A. It replaces RNA nucleotides with DNA nucleotides
B. It fixes errors in the replication of DNA
C. It adds nucleotides to the growing chain at the 3’ end
D. It is used in the polymerase chain reaction
E. All of the above

Answer 1

Hint: The main function of DNA polymerase is helps in the polymerization of nucleotides in the DNA.

Step by step answer:
DNA polymerase is an important enzyme for DNA replication. It helps in the adding of nucleotides in the growing chain at 3’ end. DNA polymerase is of 3 types – I, II, and III. DNA polymerase III is essential in the nucleotide adding on DNA. DNA polymerase I help in the proofreading of synthesized DNA. Thus, it fixes the error that occurs during DNA replication.
When the DNA replication is over, the RNA primer, which helps in the adding of nucleotides, needs to be removed. This is done by DNA polymerase. DNA polymerase thus helps in the removal of RNA nucleotides from the primer and replaces it with DNA nucleotides.
Polymerase chain reaction or PCR is a technical method that is used to make millions to billions of copies of DNA in a very short time. In this process a very small amount of DNA is taken and amplification occurs to produce a large amount of DNA. The main ingredients for PCR are genomic DNA sample, DNA polymerase, nucleotides, buffer, distilled water, and reverse primer.

Hence, option E. All of the above is the correct answer

Note: The name and functions of different enzymes that are used during DNA replication by the cell. Also, remember the PCR method. It is widely used in research for getting a large amount of DNA from a little, limited DNA sample within a very short time.