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Biology
A Level

How does natural selection occur?

There are two important terms to understand (and state in an exam!) to answer this question. 1) Genetic diversity = the number of different alleles of genes

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Answered by Tess W. • Biology tutor
4583 Views

Why do insects and other animals need developed transport systems?

They have a high metabolic rateAs a result, they have a high oxygen and glucose demandDiffusion is not efficient alone as it is too far

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Answered by Freya B. • Biology tutor
4230 Views

Describe the sequence of events of the clotting cascade that will lead to a blood clot in a damaged blood vessel

Thromboplastin is released from damaged tissue and platelets, which activates an enzyme that catalyses the conversation of the protein prothrombin to thrombin. This occurs in the presence of Calcium and V...

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Answered by Laura T. • Biology tutor
4544 Views

What gives rise to antibiotic resistance?

Key pointsVARIATION: A population of bacteria aren't all identical, even having all derived from a single bacterium. Rapid genetic exchange gives rise to mutations. SELECTION PRESSURE: By adding th...

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Answered by Aman S. • Biology tutor
2595 Views

What is the difference between transcription and translation?

Transcription and translation are both part of protein synthesis; when we use the genetic code to make proteins. These words describe two different stages of the process:Transcription is when you use the ...

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Answered by Amelia G. • Biology tutor
2465 Views

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