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How do organisms obtain energy?

Organisms, such as humans, take in "substrates" such as glucose, in our food. During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; this takes...
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Answered by Alastair R. • Biology tutor
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Why food needs to be digested?

Food constitutes of a mix of nutrients, which cannot be used unchanged from the organism to cover its special needs. Digestive system is designed to convert complex molecules (like carbohydrates and proteins...
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Answered by IOANNA T. • Biology tutor
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Garlic contains a chemical called Allicin which has antimicrobial properties. Describe how this could have occurred through natural selection.

Allicin has antimicrobial properties and can therefore protect garlic from fungal and bacterial infections and is coded for in the DNA of the garlic by an allele. The presence could have been the result of w...
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Answered by Lorenzo C. • Biology tutor
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What are the modes of genetic inheritance?

Genetic conditions can be passed on from parent to offspring in a number of different 'patterns;' these are the modes of inheritance. In autosomal dominant conditions, only one mutated copy of the gene is re...
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What is the difference between meiosis and mitosis?

There are a few fundamental differences between these processes. Mitosis is required for cell growth and repair and asexual reproduction. Meiosis is used in the production of gametes for sexual reproduction....
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Answered by Alexis B. • Biology tutor
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