Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Neutrons consist of fundamental particles known as quarks and gluons. Gluons carry the strong nuclear force that binds together the quarks in a neutron. Answer: gluons
Example Output: The two main fundamental particles that make up neutrons are quarks and what else?

Example Input: Passage: In eukaryotic cells, the DNA is kept in the nucleus. The nucleus is surrounded by a double membrane called the nuclear envelope. Within the nucleus is the nucleolus. Answer: nucleus
Example Output: In eukaryotic cells, where is the dna kept?

Example Input: Passage: Nonliving things can also be damaged by radiation. For example, high levels of radiation can remove electrons from metals. This may weaken metals in nuclear power plants and space vehicles, both of which are exposed to very high levels of radiation. Answer: metals
Example Output:
High levels of radiation can remove electrons from?