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What is the difference between a saturated and an unsaturated? (2 marks)

A saturated lipid has no carbon double bonds in the R group of the fatty acid.An unsaturated lipid has one or more carbon double bonds in the R group of the fatty acid.
LK
Answered by Lydie K. • Biology tutor
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Explain the process of mitosis.

Mitosis is a process that is normally explained in four stages - prophase, metaphase, anaphase and telophase. In prophase , the chromosomes condense and clump together in the middle of the cell. They duplica...
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Answered by Megan L. • Biology tutor
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Describe the passage of blood through the left side of the heart. Include the names of the valves between the chambers.

This is a typical question that could be asked in your exam and so it’s important to break it down in terms of its content, as well as its format. format: this is a describe question and thus doesn’t need va...
LH
Answered by Lewis H. • Biology tutor
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explain the breakdown of erythrocytes in the body

erythrocytes / red blood cells are broken down in the liver. They enter the liver through the hepatic artery and are engulfed (phagocytosis) by Kupffer cells on the inner wall of sinusoids in the liver. Kupf...
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Answered by rosie M. • Biology tutor
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Describe and explain how the human lungs are adapted for efficient gas exchange (3 marks)

There are millions of alveoli (gas exchange surface), so they have a very large surface area collectively, which is further increased by having a folded membrane. A larger surface areas means there is a fast...
Answered by • Biology tutor
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