Final answer:
The fatty acid tails in trans fat can be saturated, monounsaturated, or polyunsaturated. Trans-unsaturated fats have their fatty acid tails on opposite sides of the double bond, giving them a straighter shape compared to cis-unsaturated fats.
Step-by-step explanation:
Trans fat refers to the configuration of the fatty acid tails in a molecule. These tails can be saturated, monounsaturated, or polyunsaturated. Trans-unsaturated fatty acids are unsaturated fats with the double bonds in a trans configuration. This means that the fatty acid tails are on opposite sides of the double bond, giving the molecule a straighter shape compared to cis-unsaturated fats.