Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

The properties of the alkali metals are similar to each other as expected for elements in the same family.
The properties of the alkali metals are similar to each other as expected for elements in the same what?

Phospholipids are the main component of the cell membrane.
What is the main makeup of the cell membrane?

Phototaxis is the term for movement toward light.

What is the term for movement toward light?