Question

What is S- layer?

(a) Solid layer

(b) Surface layer

(c) Secondary layer

(d) Soluble layer

This question was addressed to me in exam.

I'm obligated to ask this question of Extracellular Matrix and Cell Interactions in division Extracellular Matrix and Cell Interactions of Cell Biology

Answer 1

The correct choice is (b) Surface layer

To explain: The S-layer is otherwise known as a surface layer. It is present in the cell wall of most of the archaea bacteria. This layer is composed of proteins and glycoproteins. They are about a thickness of 5 to 25nm.