Tag: biology

Questions Related to biology

The outer covering of non-myelinated neurons in brain is?

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Neurilemma

  2. Axolemma

  3. Oolemma

  4. Sarcolemma

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Correct Option: B
Explanation:

Unlike unmyelinated axons in periphary nerves which an embedded in neurilemma of Schwann cells, those of central nerves lie free in neuropil(nertwork of glial cells and nerve cell components).

So the correct option is B.

Nissl granules are absent in _________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Neuron

  2. Axon

  3. Cyton

  4. Dendrite

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Correct Option: B

Which of the following possesses nodes of Ranvier?

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Medullated nerve fibre

  2. Non-medullated nerve fibre

  3. Muscle fibre

  4. Medullated and non-medullated nerve fibres

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Correct Option: A

Nissl granules found in cyton of a neuron and having affinity for basic dyes are composed of _________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. DNA

  2. RNA

  3. Proteins

  4. Amino acids

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Correct Option: B

In a neuron, Schwann cells occur in associated with ____________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Axon

  2. Soma

  3. Dendrite

  4. Axon hillock

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Correct Option: A
Explanation:
Answer is option A i.e. "Axon"
Schwann cells cover the surface of all axons. Hence, Schwann cells are found in close contact with axons in the peripheral nerves. Schwann cells form the myelin sheath and are the main glial cells in the peripheral nervous system.

In medullated nerve fibre, nodes of Ranvier represent areas ______________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Swellings on axon

  2. Myelin sheath touches axon

  3. Swelling on cyton

  4. Depressions found on cyton

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Correct Option: B

Nissl's granules are made of ______________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Ribosomes$/$RER

  2. SER

  3. DNA

  4. Golgi bodies

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Correct Option: A

Nissl granules occur in _____________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Bone cells

  2. Mast cells

  3. Nerve cells

  4. Chondrocytes

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Correct Option: C

Nodes of Ranvier occur in ____________.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Cell body

  2. Right atrium

  3. Right ventricle

  4. Medullated nerve fibres

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Correct Option: D

Which pair of structures distinguishes a nerve cell from other cells?

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Vacuole and fibres

  2. Nucleus and mitochondria

  3. Perikaryon and dendrites

  4. Flagellum and medullary sheath

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Correct Option: C