Back to the full dot-point answer
SingaporeBiologyQuick questions
Biological Molecules and Enzymes
Quick questions on Carbohydrates, fats and proteins explained: O-Level Biology
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. Their building blocks are simple sugars such as glucose. Many glucose units joined together form larger carbohydrates such as starch (the plant store) and glycogen (the animal store), or the structural carbohydrate cellulose in plant cell walls.
What is fats (lipids)?Show answer
Fats also contain carbon, hydrogen and oxygen, but with far less oxygen than carbohydrates. Their building blocks are fatty acids and glycerol: one glycerol joined to three fatty acids makes a fat molecule.
What are proteins?Show answer
Proteins contain carbon, hydrogen, oxygen and nitrogen (and sometimes sulfur). The nitrogen is the key extra element that distinguishes proteins from the other two groups. Their building blocks are amino acids, joined in long chains and folded into a particular shape.
What is q1?Show answer
Name the elements found in a carbohydrate. [1 mark]
What is q2?Show answer
State the building blocks of a protein and a fat. [2 marks]
What is q3?Show answer
Explain why proteins are needed for growth. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.