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fimbriae and pili both are surface structure of bacteria but fimbriae are always found much in number having 3to25 nm diameter and 0.5 to 20 micrometer in length.
whereas pili are always found less in no generally 2 or more .
fimbriae are specialized for attachment of bacteria to its host as in case of pathogenic bacteria salmonella typhimurium , Nisseria gonorrhoea , bordella pertussis.
whereas pili are responsible for sexduction (conjugation) in bacteria ,and serves as receptors for certain viruses.
both fimbriae and pili are divided in many classes according to work they perform such as twiching motility of bacteria is observed in type 4 class..
besides these both are always noticed in gram (-) bacteria only exception cornibacterium renale (gram+).
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FranBacterial fimbriae are short, hair-like appendages used for adhesion to surfaces or other cells, while flagella are long whip-like structures that enable bacteria to swim in liquid environments. Fimbriae are more numerous and shorter than flagella. Flagella are used for movement, whereas fimbriae are used for attachment.
- Flagella are long and thread like, whereas fimbriae are short and thin.
- Flagella are composed of flagellin whereas fimbriae are made up of pilin.
- Unlike flagella fimbriae produce surface pellicles in liquid media.
- Flagella can be visualized in electron microscope and dark ground microscope, whereas fimbriae can be seen under electron microscopy only.
- Flagella help in locomotion, fimbriae help as sex pili in haemagglutination, and in adhesion.
- Flagella in different bacteria are antigenically different which is not so in fimbriae.
- Flagella are found in gram positive and negative bacteria while fimbriae are found in gram negative only.
- flagella are stained positively with phosphotungstic acid while fimbriae stain negatively.
Cilia are motile structures made from microtubules and dyneins.
They can whip or beat themselves to propel a cell through fluid, or to brush particles and fluid over itself.
They are very similar to flagella but cilia tend to be shorter.
These are found on eukaryotes like animal cells.
Fimbriae are filamentous protein structures that are similar in structure and function to pili, but generally shorter.
Fimbriae enable cells to adhere to animal tissues (by binding to cell glycoproteins) or to form pellicles (thin sheets of cells on a liquid surface) on surfaces.
These are found on prokaryotes like bacteria.
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What are bacterial structures involved in the passage of DNA into or out of the cell?
Bacterial structures involved in the passage of DNA into or out of the cell include pili, which facilitate the transfer of DNA between bacterial cells through conjugation, and the cell membrane, which allows for DNA uptake during transformation or release during secretion. Additionally, some bacteria use specialized structures such as plasmids or phages to transfer genetic material between cells.
What is the major differences between a bacterial cell and the cell of other organisms?
All bacterial cells do not have a nucleus but the cells of other animal have nucleus which is usually spherical or oval in shape inside it there are chromosomes that form a dense tangle referred to as chromatin.
Does flagella allow bacteria to conjugate?
No, flagella are used for movement, not for conjugation in bacteria. Conjugation involves the transfer of genetic material between bacteria through a pilus, a specialized appendage.
What is the finger-like processes that work to propel the discharge ovum into the tube are called?
The finger-like processes that propel the discharged ovum into the fallopian tube are called fimbriae, specifically the infundibulum with its fimbriae. The fimbriae create a sweeping motion to capture the ovum and guide it into the fallopian tube for potential fertilization.
What are the main difference between mitochondrial and chloroplast DNA's?
The ribosomes of chloroplasts closely resemble bacterial ribosomes, while mitochondrial ribosomes show both similarities and differences that make their origin more difficult to trace.
