Question 1: The oldest known ________
prokaryotes were laid down approximately 3.5 billion years ago,
only about 1 billion years after the formation of the Earth's
crust.
Question 7: A distinction between prokaryotes and eukaryotes (meaning true kernel, also spelled
"eucaryotes") is that eukaryotes do have "true" nuclei containing
their ________, whereas the genetic
material in prokaryotes is not membrane-bound.
Question 8: [6]
However, prokaryotes do possess some internal structures, such as
________,[7][8] and the
bacterial order Planctomycetes have a membrane around
their nucleoid and contain other membrane-bound cellular
structures.
Question 10: The prokaryotes (singular pronounced /proʊˈkæriət/) are a group of organisms that lack a ________ (=
karyon), or any other membrane-bound organelles.