Is there a large and small size of cake yeast?

Here's why:

* Cake yeast is not a thing: Cake yeast doesn't exist. Cakes generally don't use yeast for leavening. They are leavened with baking powder or baking soda.

* Yeast is for bread: Yeast is a living organism that ferments sugars and produces carbon dioxide, causing bread to rise. It's not used in cake recipes.

If you're looking for yeast, it comes in various forms, including:

* Active dry yeast: This is the most common type and needs to be rehydrated in warm water before use. It's usually sold in small packets or jars.

* Instant yeast: This type dissolves directly into the flour, eliminating the need for rehydration. It also comes in small packets or jars.

* Fresh yeast: This is a soft, cake-like yeast that's typically sold in blocks.

The amount of yeast you use will depend on the recipe, but it's not categorized by "large" or "small" size.