The following table depicts characteristics of five prokaryotic species (1-5). Use the information in the table to answer the following question. (no partial credit) Trait Plasmid Gram Staining Results Nutritional Mode Other features Species 1 R variable Chemohetero- troph Fimbriae Species 2 Species 3 None R variable Chemohetero- troph Internal membranes negative Chemohetero- troph Flagellum Species 4 F negative Chemohetero- troph Pili Species None negative Photoauto- tropb thylakoids
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
1. Which species of bacteria is not a heterotroph? (choose all that apply)
2. Which two species contain more cytoplasmic phospholipid membranes than the others? (choose 2)
3. Which species is capable of directed movement?(choose 1)
4. Which species have a cell wall that consists partly of an outer membrane of lipopolysaccharide? (choose all that apply)
5. Species 4 is pathogenic if it gains access to the human intestine. Which other species, if it coinhabited a human intestine along with species 4, is most likely to become a recombinant species that is both pathogenic and resistant to some antibiotics? (choose 1)
6. Which species most likely includes cells that are Hfr cells? (choose 1)
7. Which species might be expected to form biofilms and create a surface of multiple resistant prokaryotes ? (choose 1)
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