A plasmid that is attached to the cell membrane or integrated into the bacterial chromosome is called an episome (q.v.). Plasmids are extremely valuable tools in the fields of molecular biology and genetics, specifically in the area of genetic engineering (q.v.).
Gerund and Infinitive: Whatâs the Difference? Knowing the difference between gerund and infinitive can save you from making costly grammar mistakes when writing. In a nutshell, a word formed from a verb acting as a noun and ending in ing is a gerund. Infinitive phrases â normally referred to as infinitives â are formed with the word to in front of a verb.
A verb expresses an action or indicates a state or condition. An infinitive is the form of a verb that shows no subject or number, such as comprar/ to buy, vender/ to sell, recibir/ to receive. Verbs consist of a stem, such as compr in comprar, vend in vender, recib in recibir, and an ending, such as-ar, -er, -ir.