Tutor profile: Chelsea D.
Which popular substance can simultaneously exist as solid, liquid and gas.
How does the phospholipid bilayer help cells to keep their contents whilst guarding against unwanted substances?
The phospholipid bilayer is both hydrophobic and hydrophilic which helps it to only interact with water and gas molecules; and guard against large and fatty molecules that the cell doesn't need.
If there are 50 sheep per shepherd and there are eight shepherds, how many sheep are there in total?
To answer this question, we need to obtain a ratio: 50 sheep : 1 shepherd The number of sheep per 8 shepherds, we will call x Therefore; 50:1 Then we will cross multiply- 1x=400 x=400 There are 400 sheep in total x :8
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