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What are the differences between animal and plant cells?

Animal and plant cells are very similar as they both have a cell membrane, a cytoplasm and a nucleus.However, plant cells also have a permanent vacuole, chloroplasts and a cell wall.

Answered by Isobel H. • Biology tutor

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What is osmosis?

To understand osmosis, first you need to understand water potential. Pure water has a water potential of 0, and as it becomes less pure (due to things dissolving in the water) the water potential goes dow...

Answered by • Biology tutor

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CO(g) + 2H2(g) ⇌ CH3OH(g). A pressure of 100 atmospheres is used instead of atmospheric pressure. The higher pressure gives a greater yield of methanol and an increased rate of reaction. Explain why.

4 marksExplanation: Increasing the pressure (gases) of reactions increases the frequency of collisions, therefore increasing the rate of reaction.If the ...

Answered by George O. • Chemistry tutor

7218 Views

l1 and l2 are tangents of a circle. l1 intersects the circle at (3-√3,5) with a gradient of √3, and l2 intersects the circle at (3+√2,4+√2) with a gradient of -1. Find the centre of the circle, and hence find the radius of the circle.

To first find the centre of the circle, the key fact to remember is that the radius of a circle is normal (perpendicular) to any tangent. This means if you take the normals to both of these tangents at th...

Answered by James B. • Further Mathematics tutor

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“La tolerancia entre diferentes creencias es esencial”. ¿Qué opinas tú?

La tolerancia es un valor moral esencial para funcionar convenientemente en sociedad. Aunque las costumbres y hábitos de otras personas nos parezcan incomprensibles e inútiles es necesario respetarlos. As...

Answered by • Spanish tutor

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