Question

Choose the wrong statements regarding bacterial cell.

(a)Glycocalyx is the outermost envelope in bacteria.
(b)Glycocalyx could be a loose sheath called capsule.
(c)Glycocalyx may be thick and tough called slime layer.
(d) Special structure formed by the plasma membrane is called mesosome.
(e) Small bristle-like fibres sprouting out of the cell are called fimbriae.

• A. $a$ and $d$ are wrong
• B. $d$ and $e$ are wrong
• C. $b$ and $c$ are wrong
• D. $a$ and $e$ are wrong

Answer 1

The correct option is C $b$ and $c$ are wrong

Statement a
Statement : Glycocalyx is the outermost envelope in bacteria.
Elaboration : Glycocalyx is the outermost layer of cell envelope in bacteria. It is made up of polysaccharides. Hence, statement $\left(a\right)$ is correct.

Statement b
Statement : Glycocalyx could be a loose sheath called capsule.
Elaboration : Glycocalyx when present in the form of a loose sheath is known as slime layer. Slime layer provides motility and adhering capability to bacteria. Hence, statement $\left(b\right)$ is incorrect.

Statement c
Statement : Glycocalyx may be thick and tough called slime layer.
Elaboration : The thick, tough and protective glycocalyx is known as capsule. It is found in infectious bacteria. Hence, statement $\left(c\right)$ is incorrect.

Statement d
Statement : A special structure formed by the plasma membrane is called mesosome.
Elaboration : Mesosomes are infoldings of plasma membrane into the cytoplasm in form of tubules, vesicles or lamellae. It helps in basic functions like respiration, secretion etc. Hence, statement $\left(d\right)$ is correct.

Statement e
Statement : Small bristle-like fibres sprouting out of the cell are called fimbriae.
Elaboration : Fimbriae are small protein bristles present on the surface of bacteria. They help in attachment of bacteria to the substratum or to the host. Hence, statement $\left(e\right)$ is correct.

Hence option (C) b and c are wrong.