What is a major difference between prokaryotes and eukaryotes?
a. prokaryotes have no nucleus.
b. all prokaryotes cause disease.
c. eukaryotes contain more mitochondria.
d. nucleic acids are founds only in eukaryotes.

The correct answer is A) Prokaryotes have no nucleus.

Prokaryotes are the single celled organisms, which do not possess a well defined membrane bound nucleus and other organelles. The genetic material is all these organisms is present in the cytoplasm of the cell.

Example- Bacteria.

Whereas, eukaryotes are single or multicellular organisms, which possess a well defined nucleus ( with genetic material in it) as well as other organelles like mitochondria, golgi complex, endoplasmic reticulum.

Example- Plant cell.

Thus, option A) is the right answer.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.