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Name the 3 structures within a plant cell that are absent from an animal cell and describe the function of these 3 structures. (6 marks)

Plant cells contain chloroplasts (1), a cell wall (1) and a permanent vacuole (1). These structures are absent from animal cells. Chloroplasts contain chlorophyll which abso...

Answered by Hannah L. • Biology tutor

4995 Views

Define Hobbes' social contract theory.

In "Leviathan" Hobbes describes the state of nature as a violent place where individuals live in constant fear of each other thus making their lives solitary, poor, nasty and brutish. Deprived f...

Answered by Bily G. • Politics tutor

2571 Views

A student wanted to make 10.0 g of zinc chloride. The equation for the reaction is: ZnO(aq) + 2HCl(aq) → ZnCl2(aq) + H2O(l) Calculate the mass of zinc oxide the student needs to react with the dilute acid to make 10.0 g of zinc chloride. [4 marks]

What do we know from the question? 1. we know the balanced equation 2. we know the mass of zinc chloride we want to form. using the equation number of moles = mass/Mr we can calculate the number of moles ...

Answered by Arun S. • Chemistry tutor

7504 Views

How do I sketch a function from its equation without using my graphical calculator?

When sketching a graph there are some important points to consider - if you can pinpoint these special places on your graph, you will be able to sketch the whole shape of the graph.
Intercepts - the...

Answered by • PAT tutor

1241 Views

Explore the ways in which the individual's relationship with God is presented in 'Redemption' by George Herbert and 'Batter my heart' by John Donne.

While both poems support the more loving and compassionate God of the New Testament, Donne's portrayal of the individual's relationship with God retains a violence that is conspicuously absent in Herbert'...

Answered by Yii-Jen D. • English Literature tutor

5201 Views