Trans fat
No. Trans fats are unsaturated.
MOINOSATURATED
The difference between saturated and unsaturated fats lies in the bond, because the shapes determine how the various fats act in the body.
Yes, but trans are much worse.
No, saturated fats and trans fats are different. Saturated fat increases low-density lipoprotein, which is bad for you. Trans fats do the same thing, but also lower high-density lipoprotein, which is good for you. Trans fats are a lot worse.
Trans fats are hydrogenated unsaturated fats and they are supposed to be the worst fats there are for your health. Unsaturated fats are healthy fats and saturated fats and trans fats are unhealthy fats. Trans fats are often added to processed foods to extend the shelf life. There are no such fats as cis fats. There are certainly cis fatty acids and trans fatty acids and the difference between the two is in the hydrogen atoms positions and one could be regarded as an isomer of the other. All fats are basically triglycerides which means glycerol triesterified with 3 fatty acids.
Saturated Fat
Trans fats have a different structure than saturated fats, specifically the chemical structure is more rigid, allowing them to be solids at room temperature and thus not easily broken down or digested in the body.
Saturated and Unsaturated.
You are probably referring to "trans" fats. These refer to hydrogenated fats (oils that have added hydrogen through chemical processing and remain solid at room temperature), and their severely unhealthy nature is undisputed.
Trans fats made from plant sources of fat. Plant fats tend to comprise mostly of unsaturated fatty acids which is why oils are not solid. They are chemically altered to have more hydrogen which results in them being more solid like animal fats such as butter which are higher in saturated fatty acids. Chemically trans fats are unsaturated fats but structurally they are like saturated fats.