You are given a sentence and your task is to generate another sentence that supports the given input.

Animal cells lack the rigid cell walls that characterize plant  cells.
A cell wall is found in a plant cell but not in an animal cell.

Electromagnetic waves (X-rays, light, radio, radar and TV waves) are examples of transverse waves formed by electric and magnetic fields vibrating together at right angles to the wave's motion.
Because the fields that make up an electromagnetic wave are at right angles to each other and to the direction that the wave travels, an electromagnetic wave is considered a(n) transverse wave.

Viral vectors are a tool commonly used by molecular biologists to deliver genetic material into cells.

A viral vector is the name for a tool commonly used by molecular biologists to place genetic material into cells.