Given a scientific question, generate a correct answer to it.

[EX Q]: The fetus is connected to what by a tube called the umbilical cord?
[EX A]: placenta

[EX Q]: What form do alkali metals take at room temperature?
[EX A]: solid

[EX Q]: Prokaryotic cells do not have a nucleus but instead generally have a single chromosome, a piece of double-stranded dna located in an area of the cell called the what?
[EX A]:
nucleoid