UAE
Prokaryotes
I have nucleus and membrane
bound cell organelles.
Answers
Prokaryotic cells :
A prokaryotic cell is a simple, single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle. We will shortly come to see that this is significantly different in eukaryotes. Prokaryotic DNA is found in the central part of the cell: a darkened region called the nucleoid.
Unlike Archaea and eukaryotes, bacteria have a cell wall made of peptidoglycan, comprised of sugars and amino acids, and many have a polysaccharide capsule. The cell wall acts as an extra layer of protection, helps the cell maintain its shape, and prevents dehydration. The capsule enables the cell to attach to surfaces in its environment. Some prokaryotes have flagella, pili, or fimbriae. Flagella are used for locomotion, while most pili are used to exchange genetic material during a type of reproduction called conjugation.
Eukaryotic cells :
In nature, the relationship between form and function is apparent at all levels, including the level of
the cell, and this will become clear as we explore eukaryotic cells. The principle “form follows
function” is found in many contexts. It means that, in general, one can deduce the function of a
structure by looking at its form, because the two are matched. For example, birds and fish have
streamlined bodies that allow them to move quickly through the medium in which they live, be it
air or water.
A eukaryotic cell is a cell that has a membrane-bound nucleus and other membrane-bound
compartments or sacs, called organelles, which have specialized functions. The word eukaryotic
means “true kernel” or “true nucleus,” alluding to the presence of the membrane-bound nucleus
in these cells. The word “organelle” means “little organ,” and, as we learned earlier, organelles
have specialized cellular functions, just as the organs of your body have specialized functions.
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