6 Questions
Which structure is formed by the extensions of the plasma membrane into the cell?
Mesosome
What is the function of ribosomes in prokaryotic cells?
Protein synthesis
Which structure in prokaryotes like cyanobacteria contains pigments?
Chromatophores
Which of the following structures is NOT involved in bacterial motility?
Mesosome
What are elongated tubular structures in bacteria made up of special proteins called pillin?
Pilil
Which components make up the structure of flagella in motile bacterial cells?
Filament, Hook, Basal body
Study Notes
Prokaryotic Cell Structures
Mesosome
- A special membranous structure formed by the extensions of plasma membrane into the cell
Cyanobacteria
- Have membranous extensions called chromatophores into the cytoplasm, which contain pigments
Flagella
- Found in motile bacterial cells, composed of filament, hook, and basal body
- Responsible for cell motility
Pili and Fimbriae
- Pili: elongated tubular structures made up of pillin, used for attachment to host and other substances
- Filament: the longest portion of pili, extending from the cell surface to the outside
- Fimbriae: small bristle-like fibers, used for attachment to rocks in streams and host tissues
- Sex pilus: a type of fimbriae used for bacterial conjugation
Ribosomes
- The site of protein synthesis
- Attach to mRNA to form polyribosomes or polysomes
- Translate mRNA into protein
This quiz covers the various structural components of prokaryotic cells, including mesosome, cynobacteria, flagella, and pili and fimbriae.
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