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What is diffusion?

All the cells in our body communicate constantly with their surrounding environment in order to feed and excrete their wastes. Various substances in that environment pass through the cell membrane to enter o...
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Answered by Kleio C. • Biology tutor
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How do the structure of phospholipids contribute to their positioning in the cell plasma membrane?

The plasma membrane is organised into what is referred to as a lipid bilayer, consisting primarily of phospholipids and proteins. Phospholipids contain a hydrophobic (water hating) fatty acid 'tail' and a hy...
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Answered by Oluwatobi O. • Biology tutor
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Explain how bacteria may become resistant to antibiotics

Bacterial resistance to antibiotics is an example of natural selection. In a population of bacteria there may be some individuals that are not affected by the antibiotic. This may be due to random changes or...
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Answered by Rowena G. • Biology tutor
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What is the difference between meiosis and mitosis?

Meiosis - cell division to form gametes (sex cells), each gamete contains half the number of chromosomes than in a normal cell. Mitosis - division of body cells during normal growth, each cell contains a ful...
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Answered by Elizabeth P. • Biology tutor
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What is the difference between species diversity and species evenness ?

Species richness is the number of species found in an area- you simply count the number of different species. Species evenness is how evenly spread the population is across the species in an area- if you hav...
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Answered by Rebecca N. • Biology tutor
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