Biology Made Fun · Go Further
Unit 2: Chemistry of Life
The companion to Unit 2 in Biology Made Fun — the code printed on page 16, the unit's Big Picture opener. Guiding question: What are living things built from?
Animation — Chemistry of LifeThe concept animation for this unit will be embedded here.
Key ideas from the lesson
- A water molecule is two hydrogen atoms and one oxygen atom (H2O), with a slightly negative oxygen end and slightly positive hydrogen ends.
- Opposite ends attract: a hydrogen of one molecule pulls toward the oxygen of another. That weak attraction is a hydrogen bond — individually weak, powerful in crowds.
- A molecule is two or more atoms bonded together; a polymer is a large molecule made of repeating smaller units linked in a chain.
- Amino acids are the building blocks of proteins: amino acids link into chains that fold into proteins, the biomolecules that build structures and speed up reactions in cells.
- Glucose is a sugar molecule cells use as a quick source of energy.
Why this helps
Unit 2 asks what living things are built from — and the answer starts with water's crooked shape and ends with chains of building blocks. The animation shows both scales: the tiny bond that makes water behave strangely, and the chaining that builds the molecules of life.
Try this
Draw one water molecule and label which end is slightly negative and which ends are slightly positive. Then draw the hydrogen bond between it and a neighbor, and write one sentence on why that weak bond matters in crowds.
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