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Tell me what occurs in the prophase in mitosis.

Prophase The nuclear envelope breaks down exposing the chromatin The chromatin supercoils into chromosomes - can be viewed under the microscopeSpindles starts to form
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Answered by Jasleen G. • Biology tutor
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Why does the bacteria in a vaccine not harm us, but instead make us immune to diseases?

In order to build immunity to a bacteria only a tiny amount of 'inactivated' bacteria is put into the vaccine. Because the bacteria is dead/inactivated its not able to cause harm to our body but it will stil...
GH
Answered by Georgia H. • Biology tutor
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What is Osmosis?

Osmosis is the diffusion of water molecules across a partially permeable membrane, from an area of high water concentration to an area of low water concentration. For exam if you're on the tube you will go t...
NY
Answered by Nasirdeen Y. • Biology tutor
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(b) In healthy lungs, a gradient is maintained between the concentration of oxygen in the alveoli and the concentration of oxygen in the lung capillaries. (i) Describe how ventilation helps to maintain this difference in oxygen concentration.

Ventilation of the lungs is a mechanism designed to maintain a high concentration of oxygen present in the alveoli. Blood is delivered to the lungs from the heart deoxygenated, meaning the majority of haemog...
Answered by • Biology tutor
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What is homeostasis?

Homeostasis is the body's ability to keep the body's internal environment at a condition of equilibrium, in response to any external changes. This includes body temperature, salt concentration, water concent...
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Answered by Jaspreet G. • Biology tutor
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