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Describe and explain how the eye would focus on a near object. [5]

As light passes through the cornea and lens, refraction takes place at varying degrees depending on lens shape. Objects closer to the eye have diverging light rays, thus need more refraction from the lens. T...
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Answered by Saoirse E. • Biology tutor
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Explain the role of enzymes in digestion? (4 marks)

Enzymes are biological catalysts that hydrolyse chemical bonds in biological molecules, such as lipids. Enzymes are important in digestion, as they aid the absorption of molecules across the lumen of the sma...
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Answered by Intisar A. • Biology tutor
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Compare anaerobic respiration in a yeast cell with anaerobic respiration in a muscle cell.

Anaerobic respiration in yeast cells produces carbon dioxide and ethanol. Whereas anaerobic respiration in muscle cells produces lactic acid only.Both, however, do produce little amounts of ATP (energy)
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Answered by Chloe S. • Biology tutor
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Name and describe the process that leads to air entering the lungs

This process is called Ventilation and is a required step in aerobic respiration.This process starts with the diaphragm contracting, one also sees the (external) intercostal muscles contract. These contracti...
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Answered by Sam M. • Biology tutor
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Why are enzymes such as proteases and lipases used in some washing powders?

The role of enzymes such as proteases and lipases in the body is to break down proteins and fats respectively during digestion. Proteins are broken down into amino acids and fats are broken down into fatty a...
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Answered by Megan B. • Biology tutor
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