Question

The inside of your cheek or lip
gently scraped with the help of a clean toothpick and the end of the toothpick is dabbed in the middle of a glass slide. A drop of methylene blue is placed on the slide and covered with a cover slip. Now the slide is observed under a microscope. Find out the one from the following which can NEVER be seen.

(a) Cell wall

(b) Cell membrane

(c) Cytoplasm

(d) Nucleus
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Answer 1

Answer:

a) cell wall

Explanation:

As animal cell do not contain cell wall.

Answer 2

a) Cell wall is not seen under the microscope.

Explanation:

• Humans do not have cell walls. Cell walls are required in plants as they allow them to stand upright.
• However, in animals, bones and exoskeletons (arthropods and such) serve this function.
• The cell wall is primarily made of cellulose, which is composed of glucose monomers.
• The tissue that lines the inside of the mouth is known as the basal mucosa.  
• It is composed of squamous epithelial cells. The cheek cells have dense cytoplasm. It is granular and occupies a large area inside the cell.
• A prominent central nucleus is found in cheek cells.
• Cheek cells also have cellular organelles like mitochondria, Golgi apparatus, Endoplasmic reticulum, ribosomes, lysosomes, etc.