Biochemistry
生物化學
Biochemistry is the study of the molecules that make up living things and the chemical reactions that keep them alive. In this lesson you will learn about the molecules of life and how enzymes work.
生物化學是研究構成生物的分子，以及維持生命的化學反應的科學。在這一課，你會學習生命的分子，以及酶如何運作。
1 · The molecules of life
生命的分子
- Carbohydrates — give energy.碳水化合物——提供能量。
- Proteins — build and repair the body.蛋白質——建立和修復身體。
- Lipids — store energy and insulate the body.脂質——儲存能量並為身體保溫。
2 · Enzymes
酶
Enzymes are proteins that speed up chemical reactions. They are called catalysts. Each enzyme has a specific shape that fits a specific molecule, like a key fits a lock.
酶是加速化學反應的蛋白質，稱為催化劑。每種酶有特定的形狀，只配合特定的分子，就像鑰匙配合鎖一樣。
3 · Energy and ATP
能量與 ATP
Cells need energy to work. This energy is stored in a molecule called ATP. Cellular respiration releases energy from food and stores it as ATP, which the cell then uses.
細胞需要能量來運作。這些能量儲存在稱為 ATP 的分子中。細胞呼吸從食物釋放能量，並儲存為 ATP，供細胞使用。
Food → energy (ATP) → work. ATP is the energy currency of the cell.
食物 → 能量（ATP）→ 工作。ATP 是細胞的能量貨幣。
4 · Quick check
小測驗