What is a difference between prokaryotic and eukaryotic cells?

A.
Prokaryotic cells do not have a nucleus, but eukaryotic cells do.
B.
Prokaryotic cells always have cell walls, but eukaryotic cells do not.
C.
Eukaryotic cells do not have membrane-bound organelles, but prokaryotic cells do.
D.
Organisms with eukaryotic cells are always multicellular, but organisms with prokaryotic cells are not.
Undo

The correct answer is option (A) i. e. Prokaryotic cells do not have a nucleus in their cell but eukaryotic cells have nucleus in the cell.

Explanation:

The main difference between prokaryotic and eukaryotic cell is that prokaryotic cells have no nucleus in their cell while eukaryotic cells have nucleus present in the center of their cell. In prokaryotic cells, DNA or genetic material is present in the place of nucleus in the center of the cell.

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the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.