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Alex Ar [27]
3 years ago
9

Describe the "folded-fiber" model of the mitotic chromosome.

Biology
1 answer:
My name is Ann [436]3 years ago
6 0
The folded-fiber model describes<span> how a chromatin fiber becomes a </span>mitotic chromosome<span>. Ernest DuPraw proposed the </span>folded-fiber model<span> after he had made many observations of metaphase </span>chromosomes<span>.</span>
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3 years ago
What is the building block of DNA?
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What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
Sliva [168]

Answer: The diffusion of ions along the axoplasm is faster,in myelinated compare to unmyelinated,

Neurons are the structural and functioning units of nervous system.They are the vehicles for transmission of impulses as electrical signals from one part of the cells,and from one part of the body to another.

The basic structural components of a typical neuron are the cellbody, the axon, and the dendrites.

Based on structure neurons are classified as myelinated and unmyelinated.This is based on the the surrounding layer of myelin sheath around the axon. The myelin provides the insulating layer for the axon.And ensures fast movement of impluses.

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The cytoplasm of axon is called axoplasm,Since this is surrounded by myelin sheath which contains Na-K+ channels,The rate of diffusion of ions along  these channels is faster for depolarization to take place than in unmyelinated neurons. Inaddtion as these ions  diffusion increases,its jump faster at the nodes of Ranvier (saltatory conduction) to the next axoplasm which further speed up the rate of transmission.

Unmyeinated lacks myelin sheath,therefore the exchange and  the rate of diffusion of ions along the axons is low.

Explnation:

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3 years ago
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