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

Passage: Bacteria lack many of the structures that eukaryotic cells contain. For example, they don't have a nucleus. They also lack membrane-bound organelles, such as mitochondria or chloroplasts. The DNA of a bacterial cell is also different from a eukaryotic cell. Bacterial DNA is contained in one circular chromosome, located in the cytoplasm. Eukaryotes have several linear chromosomes. Bacteria also have two additional unique features: a cell wall and flagella. Some bacteria also have a capsule outside the cell wall. Answer: one circular chromosome
How many chromosomes do bacterial dna have?

Passage: The Universe contains about a hundred billion galaxies. Answer: about a hundred billion
Approximately how many galaxies are there in the universe?

Passage: Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Answer: crystals
Intrusive igneous rocks cool from magma slowly in the crust and have large what?