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Dec 15, 2020 · Another former model known as the sandwich model or Davson-Danielli model proposed that the cell membrane was a phospholipid bilayer surrounded by globular proteins. While it was the first model that included proteins, it was inaccurate. In this model, proteins coat the cell membrane instead of being integrated within it. Plasmids: In addition to the nucleoid (bacterial chromosome), bacteria may also contain one or more plasmids.A plasmid is a non-essential piece of DNA that confers an advantage to the bacteria, such as antibiotic resistance, virulence (the ability to cause disease) and conjugation (a bacterium’s ability to share its plasmids with other bacteria). Bacteria and Viruses. Protists. Fungi. Plants. Invertebrates. Chordates. Human Body. Extra Credit. ... Eukaryotic Cell Model at Cells Alive! Insect Hunt Game is lots ... What is a cell? Edit. In 1665 the British scientist and philosopher Robert Hooke was one of the first persons to carry out the microscopic observation of biological objects. . In examining samples of cork he recorded that it comprised regular, discrete structures which he called “cells” likening them to the small rooms occupied by mo