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Bacterial cells may be motile or non-motile. If motile, they have thin filamentous extensions from their cell wall called flagella. Bacteria show a range in the number and arrangement of flagella. Bacterial flagellum is composed of three parts – filament, hook and basal body. The filament
cell–cell interaction and provides mechanical strength and protection from infection. Gram-positive bacteria have a thick cell wall with the single plasma membrane (Fig. 2.4 (a)). In contrast, gram negative bacteria have a thin cell wall surrounded by a dual plasma membrane (Fig. 2.4 (b)). Cell wall continuously grows and changes its shape
Bacterial cells may be motile or non-motile. Motile bacterias have flagella composed of three parts − filament, hook and basal body. Pili and fimbriae are surface structures which do not play any role in motality. These structures help the bacteria to attach with rocks and the host tissues.
Read and download NCERT Class 8 Science Cell Structure And Functions in NCERT book for Class 8 Science. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Science textbook for Class 8 is designed by NCERT and is very useful for students.
Fundamental structural and functional unit of all living organisms. Cytology – study of cell and cellular structures. Independent existence. Performing the essential functions of life. Anything less than a complete structure of a cell does not ensure independent living.
Different sets of organs perform the various functions you have listed. In this chapter, you shall learn about the basic structural unit of an organ, which is the cell. Cells may be compared to bricks. Bricks are assembled to make a building. Similarly, cells are assembled to make the body of every organism.
Cell — Structure And Functions is a chapter in 2. Science Book of Class 8 which is issued by NCERT, These books are considered to be the best for preparing for competitive exam and having clear understanding of concept.
