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.).
A gerund is a form of a verb used as a noun, whereas a participle is a form of verb used as an adjective or as a verb in conjunction with an auxiliary verb. In English, the present participle has the same form as the gerund, and the difference is in how they are used. When used with an auxiliary verb (is walking), it serves as a verb and is the present participle. When used as an adjective (a walking contradiction) it is also a participle.
Infinitives. An infinitive is a verbal consisting of the word to plus a verb (in its simplest stem form) and functioning as a noun, adjective, or adverb. The term verbal indicates that an infinitive, like the other two kinds of verbals, is based on a verb and therefore expresses action or a state of being.oints to remember. 1  An infinitive is a verbal consisting of the word to plus a verb; it may be used as a noun, adjective, or adverb. 2  An infinitive phrase consists of an infinitive plus modifier(s), object(s), complement(s), and/or actor(s).