A.has an internal structure consisting of a membrane–bound nucleus and membrane–bound organelles
Eukaryotic cells are those cells which posses a membrane bound nucleus and other organelles are also membrane bound. The examples of the organelles are ribosomes which synthesize proteins, endoplasmic reticulum which functions in sorting and packing of proteins, mitochondria which are responsible for the production of energy molecules called as Adenosine Triphosphates. They exhibit a well define nucleus which contains a genetic material in the form of DNA. The organisms which exhibit eukaryotic cells are protozoa, plants and animals.
c.an organism whose cells each contain a membrane-bound nucleus
Eukaryotes or eukaryotic cells have a cell nucleus and organelles enclosed within membranes. Eukaryotes can be unicellular or multicellular. Most complex life forms are eukaryotes. In contrast, prokaryotes don’t have a nucleus and don’t have things like mitochondria or chloroplasts. Their DNA, proteins, and metabolites swim freely in the cytoplasm and not enclosed in organelles.
Has an internal structure consisting of a membrane–bound nucleus and membrane–bound organelles
Eukaryotic cells are those that have a nucleus delimited by a nuclear envelope. In this cellular type, the genetic material is not spread through the cytoplasm, as in the prokaryotic cells, but, rather, restricted to the nucleus region. Within the cytoplasm of the eukaryotic cell are immersed several membranous organelles that present the most diverse functions.
The answer is:
A. An organism whose cells each contain a membrane-bound nucleus.
Hope that helps. :)
this is what I know^^ I'm not so sure But I think it's A
cell regulation is conducted by special proteins.