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Biomolecules and Enzymes
Quick questions on Carbohydrates, proteins and fats: N(A)-Level Biology Biomolecules
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are carbohydrates?Show answer
Carbohydrates contain the elements carbon, hydrogen and oxygen. They are made of simple sugars (such as glucose) as their building blocks. A single sugar like glucose is a simple carbohydrate; many sugars joined together make a complex carbohydrate such as starch (in plants) or glycogen (stored in animals). The main job of carbohydrates is to provide energy, which is released by respiration.
What are proteins?Show answer
Proteins contain carbon, hydrogen, oxygen and nitrogen. They are made of amino acids joined together in long chains. There are many different amino acids, and the order in which they are joined decides which protein is made. Proteins are used for growth and the repair of cells and tissues.
What is fats (lipids)?Show answer
Fats contain carbon, hydrogen and oxygen, like carbohydrates, but with much less oxygen. They are made of fatty acids and glycerol as their building blocks. Fats are used as a store of energy (they contain more energy per gram than carbohydrates), as insulation to keep the body warm, and to protect organs.
What is q1?Show answer
State the building blocks of proteins. [1 mark]
What is q2?Show answer
Give the main use of carbohydrates in the body. [1 mark]
What is q3?Show answer
Explain how you could tell, from its elements, that a molecule is a protein rather than a carbohydrate. [2 marks]
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