Answer:
(d) Cell wall
Explanation:
The cell wall is a structure located on the outside of the cell membrane in the cells of plants, bacteria, fungi, and algae. It is a resistant, tough and flexible layer, which has the vital function of supporting the osmotic pressure inside the cell, preventing the cell from lysis when water enters. Besides, it has the function of giving rigidity, support and defining the shape of the cell.
Bacteriophages like other viruses, consist primarily of a protein coat and ackaged DNA. Description on the function of critical enzyme; DNA helicase unwinds its two strands and makes a replication fork. The enzyme primase puts down a short RNA strand complementary to a short sequence of DNA being replicated to initiate a new strand of DNA. DNA polymerase elongates the new strand of DNA, building a new anti-parallel strand.
It's caused by the absence of an enzyme that helps break down fatty substances.