Final answer:
The twisted structure of Saturn's F Ring and similar rings are due to the gravitational influence of small moons known as shepherd moons like Pandora and Prometheus which confine and shape the rings.
Step-by-step explanation:
The peculiar twisted structure of the F Ring of Saturn is likely caused by the gravitational forces of small nearby moons known as shepherd moons. Specifically, Saturn's F Ring is bounded by two small moons, Pandora and Prometheus, which help maintain its narrow and kinked structure.
Similar phenomena are observed in the rings of Uranus and Neptune where other shepherd moons influence the rings' appearance and keep the ring particles constrained within a narrow path.