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

Q: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract.

A: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what?
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Q: Sucrose is formed when a monomer of glucose and a monomer of fructose are joined in a dehydration reaction to form a glycosidic bond.

A: What is formed when a monomer of glucose and a monomer of fructose are joined in a dehydration reaction to form a glycosidic bond?
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Q: The cell starting meiosis is called a primary oocyte.

A:
The cell starting meiosis is called a what?
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