Enzymes and their Functions:

DNA polymerase: Synthesis of DNA Strands
- DNA polymerase is an enzyme responsible for the synthesis of DNA strands.
- It catalyzes the addition of nucleotides to the growing DNA strand during DNA replication.
- It reads the template DNA strand and adds complementary nucleotides to form a new DNA strand.
- DNA polymerase plays a crucial role in maintaining the integrity and fidelity of the DNA sequence during replication.

Helicase: Unwinding of DNA helix
- Helicase is an enzyme that unwinds the double-stranded DNA helix during DNA replication.
- It breaks the hydrogen bonds between the base pairs, separating the DNA strands and creating a replication fork.
- This unwinding process is necessary for DNA replication as it exposes the template strands for DNA polymerase to synthesize new strands.

Ligase: Joins together short DNA segments
- Ligase is an enzyme that joins together short DNA segments, specifically the Okazaki fragments on the lagging strand during DNA replication.
- It catalyzes the formation of phosphodiester bonds between the adjacent nucleotides, sealing the gaps and creating a continuous DNA strand.
- Ligase plays a significant role in completing the synthesis of the lagging strand during DNA replication.

Explanation:
The correct match of enzyme with its related function is option 'D' - All of these.
- DNA polymerase is responsible for the synthesis of DNA strands during DNA replication.
- Helicase unwinds the DNA helix to expose the template strands for replication.
- Ligase joins together short DNA segments, ensuring the completion of the lagging strand synthesis.
- Therefore, all three enzymes are involved in different steps of DNA replication and collectively play crucial roles in maintaining the integrity and fidelity of the DNA sequence.