Question

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

Answer 1

Hint:Within the cell wall is the plasma membrane, which, like the eukaryotic plasma membrane, is a phospholipid bilayer studded with proteins. Inserted in the membrane and out spreading to the outside may be flagella that are whip-like filaments. They spin fast, propelling the bacterium through its environment and are powered by molecular motors at their base.

Complete answer:
 Eubacteria, or “true” bacteria, are prokaryotic microorganisms having only one cell. These have a variety of characteristics and originate in various conditions throughout the world. All kinds of bacteria fall under this category, except for the archaebacteria. Eubacteria is very common, and it consists of one of the three domains of life, namely Archaea, Bacteria, and Eukarya.

The cell wall of eubacteria, contains the plasma membrane, which just like the eukaryotic plasma membrane, is a bilayer of phospholipid covered with proteins all over. The cell wall of eubacteria is made up of peptidoglycan while in some eukaryotes like fungi, the cell wall is made of chitin and in plants it is cellulosic. The nucleus of eubacteria is not restricted by any membrane. It is named nucleoid whilst in eukaryotes it is surrounded by a double-membrane envelope.

Additional information:
Eubacteria, or microorganisms lacking a defined membrane nucleus, have several general characteristics. They are all walled by a cellular wall, which is formed of peptidoglycans in a pattern of cross-linking. This provides the wall of the bacteria strength required to maintain the shape and size during environment changes. Small molecules can diffuse through the cell wall, but often a proton gradient must first be established in order for molecule exchange to properly occur. Unlike eukaryotes, bacteria have cholesterol present in the membrane to enhance permeability properties of the membrane and increase stiffness. ALike eukaryotes, bacteria too have a plasma membrane in the cell wall. Some bacteria might contain a flagella, or a structure composed of protein filaments, used for locomotion and movement.

Other bacteria might have pili that are small projections all over the outside of the cell, and are used for sticking to surfaces and transferring DNA. When a large amount of bacteria are attached to a surface and are surrounded by a polysaccharide sac, this is referred to as a biofilm. This complex has high antimicrobial resistance.

Hence, the correct answer is option B.

Note:The plasma membrane of eubacteria looks like that of eukaryotic cells. It is formed from phospholipid, protein and some polysaccharides. Eubacteria is a very common kind of species.