The correct answer to the question above is that they needed to form cell membranes. Lipids are important to living things for all the reason (that should have been listed on the question,) except to the fact that they are in need to form cell membranes.
The two main DNA lesions formed by exposure to UVB are cyclobutane pyrimidine dimers (CPD) and 6-4 pyrimidine pyrimidone photoproducts (6-4PPs), and its Dewar isomers.
