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What's the difference between a prokaryote and a eukaryote?

Prokaryotes tend to be single-celled organisms, such as bacteria, and eukaryotes are multicellular organisms like plants, animals and funghi. The two domains are also different at the cellular level, too. Pr...
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Answered by Sophia K. • Biology tutor
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Why do enzymes only catalyse specific reactions?

Enzymes are made up of specific amino acid sequences. Bonds form between amino acids in the chain in specific places. Hydrogen bonds form and fold the sequence into a secondary structure. Ionic bonding, disu...
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Answered by James D. • Biology tutor
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Describe the structure of a protein

Proteins are made up of polypeptide chains. These are chains of amino acids which are joined together by peptide bonds as a result of a condensation reaction. This produces water as a waste product.The prima...
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Answered by Hena R. • Biology tutor
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Example the process of Speciation

All population that reproduce sexually contain some degree of genetic variation, likewise, all environments will have different selection pressures. As a population reproduces, the individuals best suited to...
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Answered by Zaidi H. • Biology tutor
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Describe and explain how the lungs are adapted to allow rapid exchange of oxygen between the air in the alveoli and blood in the capillaries around them. (5 marks)

The lungs have million of alveoli which increases the surface area , therefore increasing the rate of diffusion of oxygen into the lungs. The alveoli are very thin walled , which reduces the diffusion pathwa...
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Answered by Aysha Z. • Biology tutor
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