Tag: other cell components

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Questions Related to other cell components

Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

The movement of cilia and flagella is due to the presence of _________.

  1. radial spokes

  2. central sheath

  3. singlet micritubules

  4. dyneins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Groups of dynein molecules responsible for movement in opposite directions are probably activated and inactivated in a coordinated fashion so that the cilia or flagella can move back and forth.

Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Pili, Fimbriae and flagella

  1. Play a role in motility in bacteria

  2. Are surface structures of bacteria

  3. Play a role in motility in eukaryotic cells

  4. Are elongated tubular structures made of a special phospholipid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pili, Fimbriae and flagella are structures that are found on the cell wall of the bacteria. These are structures that are made out of cellular components like proteins, for example, Pilli is made up of the protein pilin and flagella is made up of the protein flagellin.

Flagella are longer than both pili and fimbriae. These are a surface structure of the bacteria.
So, the correct option is 'Are surface structures of bacteria'

Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Arrangement of microtubules in a flagellum and a centriole is _______ and ________ respectively.

  1. $9 + 2$ and $9 + 1$
  2. $9 + 1$ and $9 + 0$
  3. $9 + 0$ and $9 + 2$
  4. $9 + 2$ and $9 + 0$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A centriole possesses a whorl of nine peripheral fibrils. Fibrils are absent in the centre. The arrangement is, therefore, called $9 + 0$. Flagellum contains an axoneme of a peripheral doublet fibrils and $2$ central singlet fibrils. This arrangement is called $9 + 2$ or $11$ stranded.
So, the correct answer is '9+2 and 9+0'.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Filaments present in flagella/cilia are

  1. Microfibrils

  2. Microtubules

  3. Microfilaments

  4. Microvilli
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Cilia and flagella are small hair-like projections from the cell and are composed of microtubules which are arranged with their positive end at the outer tip of the axoneme.
  • A microtubule is a tubular linear polymer of tubulin protein which is a part of the cytoskeleton that helps to provide structure and shape to the cytoplasm of a eukaryotic cell.
  • So, the correct answer is 'Microtubules'.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

The variation in pattern of 9+2 in cilium or flagellum is shown by 

  1. Flatworm

  2. Eel

  3. Sporozoan protozoan

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The 9+2 arrangement of fibrils is characteristics of eukaryotes being comprised of 9 peripheral doublet and 2 central singlet fibrils. Although the 9 + 2 pattern is the fundamental pattern of virtually all cilia and flagella, the axonemes of certain sporozoan protozoans and some insect sperm show some interesting variations. The spermatozoids of flatworms are also atypical. The eel sperm shows 9+0 arrangement. These atypical cilia and flagella, which are all motile, show that the central pair of singlet microtubules is not necessary for axonemal beating and that fewer than nine outer doublets can sustain motility, but at a lower frequency.

Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Which of the following statement regarding cilia is not correct?

  1. Cilia contain an outer ring of nine doublet microtubles surrounding two single microtubles.

  2. Cilia is an organelle found in prokaryotes.

  3. Cilia are short, hair-like cellular appendages.

  4. Microtubules of cilia are composed of tubulin.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cilia are short, hair like appendages extending from the surface a living cell. Cilia are found exclusively in the prokaryotes.