What are prokaryotic and eukaryotic cells?
Answers
Prokaryotic and Eukaryotic Cells
Your body's composed of trillions of cells - lots of different types of cells that make up different organs and other parts of your body. Your body is also where 10 times that number of bacteria call 'home sweet home.' But, don't be afraid - these bacteria do more good than harm to you. And besides, just in case you wanted to strike up a conversation with your tenants, you and your bacteria do have a few things in common.
All cells share some common characteristics that make them living things. All organisms are composed of cells, the basic fundamental unit of life. They contain DNA as a heritable genetic material, and they can reproduce. They transcribe DNA into RNA and translate RNA into proteins on ribosomes. They can also regulate transport across a cell membrane and require chemical energy for some cellular processes.The number one biggest difference between the bacteria in your body and the cells making up your body are these tiny cellular components called organelles. You've actually learned a lot about organelles in other lessons without knowing it. Organelles are simply membrane-bound compartments within a cell, such as the nucleus, mitochondria, chloroplasts, Golgi, and endoplasmic reticulum.
You are a eukaryote. Your cells are eukaryotic. Eukaryotic cells contain membrane-bound organelles, including a nucleus. Eukaryotes can be single-celled or multi-celled, such as you, me, plants, fungi, and insects.
Bacteria are an example of prokaryotes. Prokaryotic cells do not contain a nucleus or any other membrane-bound organelle. Prokaryotes include two groups: bacteria and another group called archaea.
Having organelles is a big deal for a cell. A bacteria cell gets along just fine without organelles, but bacteria are tiny. That's why we're able to have so many of them in our body without really noticing them. Our cells, though - they're still small to the naked eye, but they're huge in comparison to bacteria. Our eukaryotic cells are bigger in size, with much more DNA. More DNA means more transcription, and more transcription means more translation, and more translation means more proteins. Bigger cells create the need for organelles.
You can think of it this way. If you only had two pairs of shoes and a few simple outfits, you could just hang up your outfits and put your shoes on the floor inside a small closet. Simple. However, let's say you have a shopping addiction, and you have seven different pairs of black pants, ten pairs of shoes in completely different shades of brown (and other colors, of course), and you hardly ever wear the same hat twice. You can imagine that you would need a walk-in closet, complete with shelving systems to organize everything, right?
Well, organelles are an efficient way to organize everything that's going on in the cell - to compartmentalize cellular functions. That's exactly what a eukaryotic cell is doing - separating cellular processes and organizing its space. But, don't be fooled by the 'simplicity' of prokaryotes. Their smaller size and simplicity is an advantage to their lifestyle.
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On basis of their nuclear organisation, cells have been classified into two types:-
- Prokaryotic cells
- Eukaryotic cells
Prokaryotic cells
The cells which do not have well-organised nucleus due to the absence of nuclear membrane are called prokaryotic cells. The organisms with this kind of cell are called prokaryotes. For example:- Bacteria and Blue-green algae.
Eukaryotic cells
The cells which have a well-organised nucleus with nuclear membrane are called eukaryotic cells. All organisms other than bacteria and blue-green algae, have eukaryotic cells. Hence, they are called eukaryotes. For example:- Plants, animals, fungi, protozoa etc.