Tag: biology

Questions Related to biology

The word synapse was coined in 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. 1897

  2. 1997

  3. 1797

  4. 1957

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Correct Option: A
Explanation:

The term synapse was first introduced in 1897 by neurophysiologist Charles Sherrington. The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. 
Thus, the correct answer is option A.

A place where a signal passes from one nerve cell to next is described as 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Synaptic cleft

  2. Synapsis

  3. Synapse

  4. Symport movement

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Correct Option: C
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. 
Thus, the correct answer is option C.

Which structure of nervous system permits a neuron to pass impulse to another neuron?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Nerve fiber

  2. Dendrites

  3. Synapse

  4. Axon

Show answer
Correct Option: C
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. 
Thus, the correct answer is option C.

Which of the following is the component of the synapse?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Presynaptic component

  2. Postsynaptic component

  3. Both A and B

  4. Nerve impulse

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Correct Option: C
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell and acts as a communication point between the neuron and the target organ. 
Thus, the correct answer is option C.

The point of communication and target cell is

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Synapse

  2. Nodes of Ranvier

  3. Dendrites

  4. Sense organs

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Correct Option: A
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell and acts as a communication point between the neuron and the target organ. It is important for neuronal function. The nerve impulses are transmitted and received with the help of this regions. 
Thus, the correct answer is option A.

Presynaptic ending contains 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Mitochondria

  2. Lysosomes

  3. Centrioles

  4. All of the above

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Correct Option: A
Explanation:
  • The synapse consists of :
1) presynaptic ending that contains neurotransmitters, and supporting cell organelles like mitochondria and endoplasmic reticulum. 
2) postsynaptic ending contains receptor sites for neurotransmitters. and 3)synaptic cleft is the space between the presynaptic and postsynaptic endings.
The function of mitochondria in presynaptic endings is the calcium homeostasis.
  • Hence Presynaptic ending contains Mitochondria.
  • So, the correct answer is 'Mitochondria'.

Joint between axon of a neuron and dendrite of next is called

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Synapse

  2. Synapsis

  3. Junction

  4. Bridge

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Correct Option: A

Synapse is......

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Crossing over between nonhomologous chromosomes

  2. Pairing of homologous chromosomes

  3. Junction between axon and dendrite of two different neurons

  4. Zigzag junction in cardiac muscle fibres

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Correct Option: C

Association between telodendria and dendrites is known as

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Synapse

  2. Aynapse

  3. Trinapse

  4. Dynapse

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Correct Option: A

Which of the following options correctly described the sequence of structures present between a receptor and an effector when D refers dendrite, A refers axon, S refers synapse and CB refers to cell body?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. D - CB - A - S - D - CB - A

  2. A -D - CB - S - A - D - CB

  3. D - CB - A - S - A - CB - D

  4. D - A - S - CB - D - A - CB

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Correct Option: A