What Is A Cell Wall?


6 Answers

Kath Senior Profile
Kath Senior answered
The cell wall is an organelle only present in plant cells. It encloses the whole cell and surrounds the cell membrane. It is made up of lots of cross-linked cellulose fibres, which make it tough and strong.

Cellulose is a giant sugar polymer made up of long chains of smaller sugars. In the cell wall, thousands of cellulose molecules band together to form microfibrils. These also bunch together, forming much thicker fibrils. The whole structure is a little bit like fibreglass, but it is completely natural.

Some animals, like cows and sheep, can digest cellulose, which is why one of their main foods is grass. They have to chew it twice though, and pass it through several digestive stages. Humans cannot digest cellulose very well and the plant cell walls of vegetables forms the fibre that is so good for the digestive system. We can't take too much though as our digestive system doesn't have the same modifications as the cow ~ the high cellulose content of grass makes it completely indigestible and dangerous for human consumption.
lauren Profile
lauren answered
A cell wall is a fairly rigid layer surrounding a cell, located external to the cell membrane, which provides the cell with structural support, protection, and acts as a filtering mechanism. The cell wall also prevents over-expansion when water enters the cell !
Anonymous Profile
Anonymous answered
A cell wall is fully permeable, this means that almost substances can enter or pass through a cell wall. It made up of cellulose. It prevents the bursting of the plant cell and also gives the  cell a fixed shape
Anonymous Profile
Anonymous answered
It is a semi-permeable membrane found in most plant cells, which encloses the whole cell. This cell wall is made of cellulose, which protects the cell from injury.
mela Fedor Profile
mela Fedor answered
A cell wall is a semi-permeable membrane.It is selective in what can pass freely in and out of the cell and what can't.

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