The DNA polymerase was investigated by

Options

A. (a) Boliver and Rodriguez
B. (b) Korenberg
C. (c) Stanley Cohen and Herbert Boyer
D. (d) Bert

Answer

### Step-by-Step Solution:

1. **Understanding DNA Polymerase**: DNA polymerase is an enzyme crucial for DNA replication. It catalyzes the synthesis of DNA from deoxynucleotide triphosphates (dNTPs).

2. **Function in DNA Replication**: During DNA replication, DNA polymerases synthesize new DNA strands. They work in pairs to synthesize both the leading and lagging strands simultaneously.

3. **Direction of Synthesis**: DNA polymerase synthesizes DNA in the 5' to 3' direction. On the leading strand, it continuously synthesizes DNA, while on the lagging strand, it synthesizes DNA in short fragments known as Okazaki fragments, also in the 5' to 3' direction but in a discontinuous manner.

4. **Proofreading Role**: After synthesizing DNA, DNA polymerase also performs proofreading functions to correct any incorrect bases that may have been incorporated during replication.

5. **Historical Context**: The first DNA polymerase (DNA polymerase I) was isolated from the bacterium *Escherichia coli* (E. coli) by scientist Arthur Kornberg in 1959. His research team later identified additional DNA polymerases (DNA polymerase II and III).

6. **Conclusion**: Based on this information, the investigation of DNA polymerase is attributed to Arthur Kornberg.

### Final Answer:
The DNA polymerase was investigated by Arthur Kornberg.