Gluten and kneading

Flour contains two proteins, glutenin and gliadin, that link into stretchy strands once water reaches them. That network is gluten. It traps the gas yeast makes, which is why bread rises and stays chewy.
Choose flour by protein
Bread flour is about 12 to 14 percent protein, so it builds strong gluten and a chewy loaf. Cake flour is about 7 to 9 percent and bakes soft and tender. All-purpose sits in between.
Water starts gluten
Dry flour can't make gluten. Water lets the two proteins unfold and link. Wetter dough forms gluten with less kneading, which is how no-knead bread works: lots of water plus 12 to 18 hours.
Test yourself
Questions from the interactive lesson, with the answer and the why.
Why knead bread dough for 8 to 10 minutes by hand?
To line up and strengthen the gluten. Stretching and folding lines up the gluten strands and builds elasticity.
True or false: Resting dough makes it tighter and harder to shape.
False. Resting lets gluten relax, so the dough is easier to shape.
What went wrong? You mix bread dough and skip the kneading. When you stretch a piece thin, it tears right away.
The gluten hadn't formed yet. Kneading builds the gluten network. Without it, the dough tears.
Fill the blank: For tender pastries, use ___ and mix gently.
For tender pastries, use low-protein flour and mix gently. Less protein means less gluten, so the crumb stays tender.
Your pasta dough keeps springing back when you roll it. What fixes it?
Rest it, wrapped, for 30 minutes. Resting relaxes tight gluten so the dough stretches without snapping back.
Kneaded vs unkneaded dough
Feel gluten form.
Do the 30-minute experiment