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What is contained within a nucleus of a cell and how is this made up or arranged

DNA is contained within the nucleus of the cell. It contains genes which are a sequence of DNA codes. Each gene codes for a protein. All the DNA is coiled into structures called chromosomes. There are 46 chr...
DP
Answered by Dipali P. • Biology tutor
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How does muscle contraction take place?

First of all an action potential reaches the end of a motor neuron and the neurotransmitter acetylcholine is then released into the synapse. An action potential is initiated in the muscle cellSarcoplasmic re...
LH
Answered by Laura H. • Biology tutor
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Describe the movement of ions, and changes in potential, across the nerve cell membrane during depolarisation and repolarisation.

During depolarisation, sodium ions move into the cell, resulting in the membrane potential rising from -70 millivolts (mV) to +40mV.During repolarisation, potassium ions move out of the cell, and the membran...
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Answered by William P. • Biology tutor
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Describe why organisms may become extinct due to a change in the climate

Organisms may be less well adapted to the changing climate. The organisms will be outcompete by other organisms and it will be harder to them to find food and shelter which are crucial to the organisms survi...
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Answered by Jessica L. • Biology tutor
3350 Views

Name 4 organelles within an animal cell

NucleusMitochondriaGolgi ApparatusSmooth endoplasmic reticulum
ZC
Answered by Zoe C. • Biology tutor
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