Tag: single membrane bound organelles

Questions Related to single membrane bound organelles

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

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

  1. radial spokes

  2. central sheath

  3. singlet micritubules

  4. dyneins

Show answer
Correct Option: D
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.

Pili, Fimbriae and flagella

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

  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

Show answer
Correct Option: B
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'

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

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

  1. $9 + 2$ and $9 + 1$

  2. $9 + 1$ and $9 + 0$

  3. $9 + 0$ and $9 + 2$

  4. $9 + 2$ and $9 + 0$

Show answer
Correct Option: D
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'.

Filaments present in flagella/cilia are

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

  1. Microfibrils

  2. Microtubules

  3. Microfilaments

  4. Microvilli

Show answer
Correct Option: B
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'.

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

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

  1. Flatworm

  2. Eel

  3. Sporozoan protozoan

  4. All of the above

Show answer
Correct Option: D
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.

Which of the following statement regarding cilia is not correct?

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

  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.

Show answer
Correct Option: B
Explanation:

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

Which of the following is a phosphoryalting unit?

bio-chemistry life processes in living organisms- part 1 microbodies living organisms and energy production single membrane bound organelles

  1. Oxysome

  2. Vaculoes

  3. Peroxisome

  4. Mitochondria

Show answer
Correct Option: A
Explanation:

Oxysomes are found in inner mitochondrial membrane and also called ad $F _1$ or elementary particles. It contains enzymes ATP synthase responsible for synthesis of ATP. They act as phosphorylating unit.

Which of the following organ has single membrane?

bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

  1. Nucleus

  2. Cell wall

  3. Mitochondria

  4. Sphaerosomes

Show answer
Correct Option: D
Explanation:

Spherosomes are membrane covered small spherical organelles which synthesize and store fats. They are covered with a single half unit membrane.

Which one of the following is not considered as a part of the endomembrane system of eukaryotic cells?

bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

  1. ER

  2. Lysosome and vacuoles

  3. Golgi complex

  4. Peroxisome

Show answer
Correct Option: D
Explanation:

Endomembrane system of a eukaryotic cell is a membrane system that involves flow of membranes from one component to another by means of small membrane vesicles. The endomembrane system of a eukaryotic cell consists of endoplasmic reticulum, Golgi apparatus, lysosomes and plasma membrane.

Which is not true about spherosomes?

bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

  1. Arise from ER.

  2. Related to fat.

  3. Single membrane bound structure.

  4. Involved in photorespiration.

Show answer
Correct Option: D
Explanation:

Spherosomes are membrane covered small spherical organelles which synthesize and store fats. They develop from endoplasmic reticulum. In some plants, spherosomes have lysosomal activity, e.g., maize root tip.