Question

Which of the following is true about DNA polymerase ?
1) It can synthesize DNA in the 5 to 31 direction
2) It can synthesize DNA in the 3 to 5' direction
3) It can synthesize mRNA in the 3'to si direction
4) It can synthesize mRNA in the 5 to 31 direction​

Answer 1

Answer:

1 and 4 are the answers

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Explanation:

Answer 2

Answer:

1) It can synthesize DNA in the 5'-3' direction

Explanation:

Explanation for correct answer:

Option 1): It can synthesize DNA in the 5'-3' direction (correct)

DNA polymerase only synthesizes DNA in the 5'-3' direction. In prokaryotes, the main enzyme that normally carries out replication is DNA polymerase III. In eukaryotes, several types of polymerases work together to aid in DNA synthesis. Eukaryotic DNA polymerase alpha synthesizes the primer to initiate replication, and later DNA polymerase epsilon and DNA polymerase delta synthesize DNA on the leading and lagging strands, respectively.

Explanation for incorrect options:

Option 2): It can synthesize DNA in the 3'-5' direction (incorrect)

DNA polymerase lacks 3'-5' polymerase activity and therefore cannot synthesize DNA in the 3'-5' direction.

Option 3): It can synthesize mRNA in the 3'-5' direction (incorrect)

DNA polymerase does not synthesize mRNA and RNA is not synthesized in the 3'-5' direction. However, mRNA degradation occurs in a 3'-5' manner.

Option 4): It can synthesize mRNA in the 5'-3' direction (incorrect)

RNA polymerase, not DNA polymerase, synthesizes mRNA in the 5'-3' direction.

Therefore, option (1) is correct.

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