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Describe how phospholipids are arranged in a plasma membrane?

Phospholipids are arranged in a bilayer (a double layer). They have hydrophobic tailss (made of fatty acids) and hydrophilic heads (made of a phosphate group). The hydrophilic heads are to the outside and th...
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Answered by Isabelle H. • Biology tutor
38685 Views

Describe how a reflex occurs?

A reflex is an innate (in built) action designed to keep an organism safe from harm. A good example of a reflex is to imagine you touch a hot pan, you immendiately withdraw your hand from the painful stimulu...
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Answered by Isabelle H. • Biology tutor
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How do you form the present perfect tense in Spanish?

The present perfect tense is really useful and needn't worry you! In English when we say things like 'I have gone' or 'We have arrived' , this is the present perfect tense. It is used to describe an action t...
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Answered by Nathaniel A. • Spanish tutor
8031 Views

How do I form the past simple tense in Spanish?

Spanish verbs (words like 'to do' or 'to say' or 'to eat', in English) come in two main groups. Firstly, there are the -ar ending verbs, which make up about 70 per cent of Spanish verbs. Some examples of the...
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Answered by Nathaniel A. • Spanish tutor
3918 Views

Which direction would the equilibrium move if the pressure at which a reaction takes place was increased? (Le Chatelier's Principle)

Looking at the reaction between hydrogen and carbon monoxide to form methanol: CO + 2 H 2 ⇌ CH 3 OH There are 3 moles on the left hand side and 1 mole on the right hand side. According to Le Chatelier's Prin...
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Answered by Ethan C. • Chemistry tutor
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