Tag: zoology

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Questions Related to zoology

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

Tubulin occurs in

  1. Microtubules

  2. Cilia and flagella

  3. Microvilli

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tubulin belongs to the protein superfamily of globular proteins.Alpha and beta tubulins polymerize into microtubules. Microtubules function in many processes like structural support, intracellular transport, and DNA segregation. Microtubules emerge from microtubule organizing center in eukaryotic cells.

Cilia and flagella contain the motor protein dynein and microtubules, in the form of two central and nine doublets surrounding it.Cilia and flagella help in locomotion in unicellular eukaryotes.
Microvilli are cellular membrane protrusions that increase the surface area for diffusion.
Therefore option D is correct.

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

A flagellum beats

  1. Independently, undulatory and asymmetrically

  2. Independently, undulatory and symmetrically

  3. Coordinated, pendular and symmetric

  4. Coordinated, pendular and asymmetric.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Flagella are typically longer than cilia and move in a wave-like (undulatory) motion. This motion is generally independent of other flagella and symmetric in its wave propagation.

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

A cilium beats

  1. Asymmetrically by sweeping action

  2. Symmetrically by sweeping action

  3. Symmetrically by undulatory action

  4. Asymmetrically by undulatory action
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Cilia can be defined as the tiny hair-like projections on the surface of the cell.
  • These hair-like projections help in sweeping mucus, trapped dust and bacteria in the respiratory tracts.
  • It beats asymmetrically by the sweeping action
  • The asymmetrical beating pattern consists of two strokes- effective stroke and recovery stroke.
  • In an effective stroke, the cilia are straight and generate flow in the same direction as its motion.
  • Whereas, in recovery stroke, the cilia bend parallel to the surface and creates relatively weaker backward flow.
  • So, the correct answer is 'Asymmetrically by sweeping action'.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Axoneme is a structure associated with

  1. Golgi bodies

  2. Only cilia

  3. Only flagella

  4. Both cilia and flagella
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Axoneme is the central strand of a cilium or flagellum. It is composed of an array of microtubules, typically in nine pairs around two single central ones.Cilia and flagella is made of the axoneme which is composed of microtubules and their associated proteins.

So, the correct answer is 'D'.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Movement of cilia and flagella is due to presence of

  1. Central sheath

  2. Dynein

  3. Radial spokes

  4. Singlet tubules.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dynein is a family of cytoskeletal motor proteins that move along microtubules in cells. They convert the chemical energy stored in ATP to mechnical work, and hence are involved in movement of cilia and flagella.

So, the correct option is 'Dyenin'.

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

The movement of the flagellum is regulated by 

  1. Plasma membrane

  2. Nucleus

  3. Basal body

  4. Ribosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacterial flagella are helically shaped structures containing the protein flagellin. The base of the flagellum (the hook) near the cell surface is attached to the basal body enclosed in the cell envelope. The flagellum rotates in a clockwise or counterclockwise direction, in a motion similar to that of a propeller. This movement is regultaed by plasma membrane.

Thus, the correct answer is 'Plasma membrane.'

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

Find the correct statement in relation to flagella: 

  1. Flagella are longer and less in number than cilia.

  2. Flagella usually beat independently.

  3. Arms of subfibril A are made of Nexin protein.

  4. A-B linker is made of dyenin protein.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Flagella are long, numerous hairlike projections from the plasma membrane. Flagella are longer and less in number than cilia. In multicellular organisms, cilia and flagella are the major means of locomotion in prokaryotic cells, both cilia and flagella are composed of microtubles.

So, the correct option is 'Flagella are longer and more in number than cilia'.

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.