Combine yeast and 1 cup warm water in a 1-cup liquid measuring cup; let mixture stand 5 minutes.
Combine flour, sugar, and salt in a heavy-duty mixing bowl.
Add yeast mixture and oil. Beat at low speed with an electric mixer 1 minute; beat at medium speed 5 minutes.
Divide dough into 20 equal portions. Shape each portion into a 7-inch rope, and shape into a knot.
Combine egg yolk and 1 tablespoon water; brush over rolls.
Sprinkle with seeds; place on parchment paper-lined baking sheets. Turn oven off, cover rolls loosely with plastic wrap; place in oven, and let rise 15 to 20 minutes or until doubled in bulk.