Answer:
The main difference between microtubules and microfilaments is that microtubules are long, hollow cylinders, made up of tubulin protein units whereas microfilaments are double-stranded helical polymers, made up of actin proteins.
The correct chemical formula for Glycerol is option D. 
- A naturally occurring alcohol is glycerol. It is an odorless liquid that is employed as a medication, solvent, and sweetener.
- Glycerol pulls water into the intestines when it is present, softening stools and easing constipation.
- Glycerol draws water so that it stays in the body for a longer period of time when it is present in the blood. An athlete may be able to exercise longer as a result.
- In numerous personal care products like toothpaste, mouthwashes, shaving cream, and soaps, glycerol is utilized as an emollient, humectant, solvent, and lubricant. A
- Additionally, the pharmaceutical industry uses glycerol because of its hygroscopic qualities to stop lotions and ointments from drying out.
So, the correct chemical formula for Glycerol is option D. 
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Explanation:
Bacteria have a thin flexible cell wall. Only plant cells have primary and secondary cell walls.