Download App

STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
The structures that help some bacteria to attach to rocks and/or host tissues are
  • A
    mesosomes
  • B
    holdfast
  • C
    rhizoids
  • ✓
    fimbriae.
✓

Answer

Correct option: D.
fimbriae.
d
(d) : Fimbriae are small bristle­like solid structures arising from bacterial cell surface. There are $300-­400$ of fimbriae per cell. Their diameter is $3­-10\ nm$ while length is $0.5-­1.5\ \mu m$. Fimbriae are involved in attaching bacteria to solid surfaces ( $e.g.$, rock in water body) or host tissues ( $e.g.$, urinary tract in Neisseria gonorrhoeae). Some fimbriae cause agglutination of $RBCs$. They also help in mutual clinging of bacteria.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 11 - 8. Cell the unit of life→STD 11 - 8. Cell the unit of life — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

The protein related to transport of glucose in cells is:
→
Each receptor is ...$A$... to one hormone only and hence, receptors are ...$B$... Hormone receptor complex formation leads to certain biochemical changes in the ...$C$.... Choose the option containing correct combination of $A, B$ and $C$
→
Which pigment is water soluble?
→
The characteristic and an example of a synovial joint in humans is

Characteristics $-$ Examples

→
It is lack in plant root.
→
In moss, stomata appears on:
→
Cardiac arrest is the state when:
→
In $C_4$ plants, first stable product of $CO_2$ fixation is
→
Roots develop from which part of seed?
→
Which muscle helps in the movement of food in the stomach?
→