Same Shape Sally
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The bacterium that always maintains the same shape is called a monomorphic bacterium. This means it exists in a single shape form, as opposed to pleomorphic bacteria which can change shape.
No, Lactobacillus lactis is a rod-shaped bacterium, not a cocci shape. It is commonly found in dairy products and plays a role in the fermentation process.
cytoskeleton
The protein that gives the nucleus its shape is called lamin. Lamin proteins form a network underneath the nuclear envelope that provides structural support and maintains the shape of the nucleus.
Rhodospirillum rubrum is a spiral-shaped (helical) bacterium. It is a Gram-negative, non-pathogenic, photosynthetic bacterium belonging to the Alphaproteobacteria class.
The cytoskeleton maintains the cell shape with a network of protein filaments. The cytoskeleton also protects and helps with movement of cell.