Leah.J
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I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
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_Mia101
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(Original post by Leah.J)
I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
Hi!

So I believe your lecturer is wrong as ribosomes are necessary for protein synthesis (creating genetic material etc.) Therefore, all living things would need ribosomes.

Edit: excluding mature red blood cells

Because protein synthesis is an essential function of all cells, ribosomes are found in practically every cell type of multicellular organisms, as well as in prokaryotes such as bacteria. However, eukaryotic cells that specialize in producing proteins have particularly large numbers of ribosomes. - Khan Academy
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the bear
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(Original post by Leah.J)
I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
mature red blood cells do not contain ribosomes.
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mgi
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(Original post by Leah.J)
I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
Your lecturer is not correct. Bacteria are living and have ribosomes like all living cells
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mgi
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(Original post by Leah.J)
I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
except RBCs. all living cells do
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lucymellor
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(Original post by mgi)
Your lecturer is correct. Bacteria are living but do not have ribosomes.
this isn't true. bacteria have ribosomes as they need to produce proteins just as much as eukaryotes do. the prokaryotic ribosome is smaller (70S*) than the eukaryotic ribosome (80S) and functions fairly similarly with some differences in translation factors and other things. most of what we know about translation is from studying the prokaryotic ribosome since it's simpler.

pretty much all living cells have ribosomes except for red blood cells, but these are a bit of a special case and also don't contain a nucleus, so this also technically makes your lecturer incorrect when they said every living cell contains genetic material. but RBCs are a rare exception, generally it's fine to say all cells except RBCs contain genetic material, a cell membrane, cytoplasm and ribosomes.

*S = Svedberg units, relating to how a molecule diffuses through solution - don't worry about it, all you need to know is 80S is bigger than 70S.

source: biochemistry degree
Last edited by lucymellor; 1 year ago
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mgi
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(Original post by lucymellor)
this isn't true. bacteria have ribosomes as they need to produce proteins just as much as eukaryotes do. the prokaryotic ribosome is smaller (70S*) than the eukaryotic ribosome (80S) and functions fairly similarly with some differences in translation factors and other things. most of what we know about translation is from studying the prokaryotic ribosome since it's simpler.

pretty much all living cells have ribosomes except for red blood cells, but these are a bit of a special case and also don't contain a nucleus, so this also technically makes your lecturer incorrect when they said every living cell contains genetic material. but RBCs are a rare exception, generally it's fine to say all cells except RBCs contain genetic material, a cell membrane, cytoplasm and ribosomes.

*S = Svedberg units, relating to how a molecule diffuses through solution - don't worry about it, all you need to know is 80S is bigger than 70S.

source: biochemistry degree
Sorry. You are right. I did change my first post but clearly it didnt get through in time to replace the wrong post!
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lucymellor
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(Original post by mgi)
Sorry. You are right. I did change my first post but clearly it didnt get through in time to replace the wrong post!
no problem!
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Kallisto
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(Original post by Leah.J)
I’m asking because my book says yes but my lecturer said the only 3 things that every single living cell has is the cell membrane, some sort of chromosome or genetic material and cytoplasm
All the living creatures on earth have these for profucimg essential proteins. The life we know as it is cannot exists without the ribosomes. The exceptions are tiny living things like viruses (they use the ribosomes of the host cell), if you would count them as living creatures like humans and animals.
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