August 8, 2005 at 2:19 am #1614MikoParticipant
I know this sounds fairly simple . . . but are organisms living things only? Are there non-living organisms? (I really don’t remember)
Oh! one more question . . . I understand that macromolecules are molecules that are linked together like atoms link together and form molecules, but are all organisms made of all or one of each macromolecule: carbohydrates, lipids, proteins, and nucleic acids ❓
August 8, 2005 at 11:27 am #28127victorParticipant
As it stated in my microbiology book, then I will say it. There are living organisms and non-living organisms.
Living organisms: Procaryotes, Archaeans and Eukaryotes.
Non-living organisms: Virii and Prion.
For the 2nd question, let’s take the most simple living organism, procaryotes. We know that Procaryotes have Nucleic acid in their chromosomes, lipid bilayer as their membranes, carbohydrates as their inner substances, and proteins as the structure former (such as peptidoglycane, etc.). From the writting above, we can conclude that all living organisms are formed from those 4 organic macromolecules and don’t forget that there’re also inorganic substances which take part also…
August 8, 2005 at 1:50 pm #28138
Yea – molecules are the ‘building blocks’ of so many things =D
August 8, 2005 at 2:23 pm #28141Dr.SteinParticipant
Hint: Urey/Oparin’s theory of the origin of life 😉
August 9, 2005 at 8:21 pm #28192MrMisteryParticipant
i am sorry to dissapoint you victor but organism basically means “living thing”.
The only organisms are Archea, Eubacteria and Eukarya
Virii are named infectious entites, just to show that they are not living and can not be called organisms. they are considered to be at the border between living and non-living
Prions are considered non-living because they do not have nucleic acids, they are simply proteins. therefore you can not call them living
*it’s good to be back*
August 12, 2005 at 2:18 am #28279MikoParticipant
Thank you all for your response. My conclusion based on the responses are: only things that are living are considered “organisms” since organism means living thing.
I also understand that every organism consist of the four macromolecules: carbohydrates, proteins, lipids, and nucleic acids.
Thanks . . . 😉
August 12, 2005 at 3:05 am #28282canalonParticipantquote Miko:
I wouldn’t say that… It’s an oversimplification.
Carbohydrates, proteins, lipids and nucleic acids are four families, classes, “whatever you want to call that” of macromolecules (which means nothing more than “big molecules”). But in each of these families there is plenty of different molecules which are all macromolecules. And all macromolecules do not necessarily belong to those 4 families…
August 12, 2005 at 3:41 am #28285
yea- it’s just a generalisation~ 🙂
August 12, 2005 at 4:47 am #28293Dr.SteinParticipant
What about this? Living thing or organism is constructed from organic molecules including C, H, O, and N… 🙄 Awawwawaa maybe a bad idea eh? I cannot think properly today 🙁 😆
August 15, 2005 at 11:59 am #28461victorParticipant
Hmm…I’ve just read the front page of biochemistry and I found that some amino acids such as cysteine makes a link with another Cysteine with a disulfide bond…..so, I think S also included in that.. 😆
August 15, 2005 at 1:13 pm #28465
haha yea..think of rebonding when u think about cystein =)
You must be logged in to reply to this topic.