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Biology

Question: Define the term homoeostasis and using examples explain how feedback mechanisms operate to maintain homoeostasis.

Answer: Homoeostasis is an immutable characteristic life. It refers to the maintenance of the internal environment within an acceptable range. The study of Homoeostasis reveals that the balance between a living organism’s internal condition and the external environment needs to be achieved in order to acquire a dynamic equilibrium.......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: We are currently living in the sixth wave of extinction. Discuss.

Answer: It is believed by the majority of scientists that we are now currently living in the sixth wave of extinction. Extinction waves have been known to occur since some 440 million years ago. Five major waves in history have been known to mankind but few are aware that we now live in the sixth. In the first wave of extinction, about 440 million years ago, twenty-five percent of all families of mar......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Briefly outline the principles of five methods of protein purification.

Answer: Techniques of protein purification have improved greatly over the last generation. This in turn has aided our understanding of proteins and their structure and function because our better protein samples have resulted in the ability to perform more conclusive experiments. Usually protein extraction and purification is only the start of perhaps determination of the protein’s structure by crystall......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: What is a species? How do new species arise? What is the difference between the graduated and punctuated theories of speciation?

Answer: Speciation and evolution are topics in biology which are contentious and open to debate. New evidence is continually being found which reshapes our ideas about the mechanisms and patterns of speciation. There is much controversy over many aspects of this topic, from the question, ‘what is a species?’, to the pattern in which these new species arise. Darwin was the first to powerfully attack th......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Biology

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