Question

In eubacteria a cellular component that resembles eukaryotic cell is
A) Cell wall
B) Plasma Membrane
C) Nucleus
D) Ribosomes

Answer 1

Hint: It is composed of bilayer of lipids i.e. semipermeable. The main function is that it regulates the transportation of materials entering and exiting from the cells. It transports toxic substances out and nutritive substances inside that provides protection to the cell.

Complete Answer:
- Eubacteria is the plasma membrane within the cell wall that resembles the eukaryotic plasma membrane and it is a phospholipid bilayer that contains protein.
- Plasma membrane allows the passage of the items through the semipermeable membrane of the lipid bilayer. The ions passed through the plasma membrane with the help of passive transport.
- In eubacteria, the cell wall is made up of peptidoglycan whereas in some of the eukaryotes like fungi, cell wall is made up of chitin and in plants, it is made up of cellulose.
- The nucleus is not bounded by any membrane in the eubacteria and it is called a nucleoid. On the other hand, in eukaryotes, the nucleus is bounded by the double membrane.
- Ribosomes of eukaryotes are 80S types whereas in eubacteria ribosomes are 70S type. Eubacteria lack sterol that is a characteristic of eukaryotic cell membranes.

Thus, the correct answer is option B. i.e. Plasma membrane.

Note: A cellular component in the eubacteria that resembles the eukaryotic cell is the plasma membrane. Because of this, the plasma membrane provides protection to the cell by covering the outer part of the cell. Similarly, in eukaryotic organisms, the cell organelles also need protection.