Answer: Gram-negative; membrane
Porins are present in ______________bacteria because in these organisms molecules entering the cell must pass through an extra layer of ___________.
The cell envelope is composed of the cell membrane and the cell wall.As in other organisms the bacterial cell wall provides structural integrity to the cell . In prokaryotes the primary function of the cell wall is to protect the cell from internal turgor pressure caused by the much higher concentrations of proteins and other molecules inside the cell compared to its external environment.
A nuclear pore is a part of a large complex of proteins known as a nuclear pore complex that spans the nuclear envelope which is the double membrane surrounding the eukaryotic cell nucleus.There are approximately 1 000 nuclear pore complexes (NPCs) in the nuclear envelope of a vertebrate cell but it varies depending on cell type and the stage in the life cycle.
Gram-negative bacteria - Wikipedia
Gram-negative bacteria - Wikipedia
Nearly all animal life is dependent on bacteria for survival as only bacteria and some archaea possess the genes and enzymes necessary to synthesize vitamin B 12 also known as co
Gram-negative bacteria display these characteristics: . An inner cell membrane is present (cytoplasmic); A thin peptidoglycan layer is present (This is much thicker in gram-positive bacteria ); Has outer membrane containing lipopolysaccharides (LPS which consists of lipid A core polysaccharide and O antigen) in its outer leaflet and phospholipids in the inner leaflet
Tue Jan 08 2002 13:30:00 GMT-0500 (Eastern Standard Time) · Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. Being passive facilitated transport does not directly require chemical energy from ATP hydroly...
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