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Why do enzymes stop working at high temperatures?

Enzymes are biological catalysts. This means they spead up chemical reactions in the body. To understand why they might stop working, you must first look at the structure. Enzymes are proteins made up of pri...
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Answered by Caitlin M. • Biology tutor
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Using the nitrogen cycle, explain how nitrogen from the atmosphere is converted into nitrates

4 main processes: ammonification nitrification nitrogen fixation denitrification NITROGEN FIXATION: the process by which N2 gas converted --> nitrogen containing compounds (e.g. Ammonia) the most importan...
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Answered by Nawal Z. • Biology tutor
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How is blood in the veins returned to the heart?

This question requires understanding about how blood flows in the veins. The body contains three types of blood vessel: artery, vein and capillaries, each with different characteristics. Veins carry deoxygen...
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Answered by Grace B. • Biology tutor
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The events that take place during interphase and mitosis lead to the production of two genetically identical cells. Explain how.

During the S phase of interphase, the DNA is replicated in a semi-conservative manner. The parent strands are seperated and each one is then used to synthesise a new daughter strand through the addition of c...
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Answered by Conor S. • Biology tutor
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Describe and explain two ways in which alveoli in the mammalian lung are adapted for efficient gaseous exchange

Alveoli in the mammalian lung are thin walled to allow the quick passage of gases, for example oxygen and carbon dioxide. Alveoli in the mammalian lung have a large surface area which allows for the diffusio...
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Answered by Guy A. • Biology tutor
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