SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ribosomes, nucleoid and Golgi apparatus
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Ribosomes, mitochondria and pili
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Cell wall, plasma membrane and nuclear membrane
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Pili, flagella and cytoplasm
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Detailed explanation-1: -Escherichia coli cells are surrounded by a complex cell wall composed of two concentric lipid bilayers, the outer membrane and the cytoplasmic membrane with a peri-plasmic space in between. This cell wall plays many functional roles in protection, transport, locomotion, sensing, detoxification, and energy production.
Detailed explanation-2: -A typical Escherichia coli cell is propelled by a bundle composed of multiple flagella. Each flagellum is controlled by a rotary motor that can switch between clockwise (CW) and counter-clockwise (CCW) rotation. When flagella on a cell rotate CCW, the cell swims along an approximately straight path called a ‘run’.
Detailed explanation-3: -Over this wide pH range, E. coli preserves enzyme activity, as well as protein and nucleic acid stability, by maintaining the cytoplasmic pH in the range from pH 7.2 to 7.8 (26, 27, 32).
Detailed explanation-4: -E. coli has many different types of pili, but one seems particularly important in UTIs: type 1 pili. These pili are formed of subunits that assemble into a long coil-shaped rod, which is tipped by adhesive molecules that can stick to body surfaces.