How did the first cells come about?

  • Thread starter Alex48674
  • Start date
  • Tags
    Cells
In summary, the exact process of how microspheres and coacervates evolved into the first prokaryotes is still a mystery. Some theories suggest that they developed independently and eventually formed a symbiotic relationship, while others propose that DNA may have formed a cellular membrane on its own. The question of what came first, the chicken or the egg, remains unanswered and various postulations have been made. There are multiple theories on the origin of life, but no definitive answer.
  • #1
Alex48674
67
0
I understand how we get microspheres and coacervates, which aren't really living, but how do we get prom these to the first prokaryotes? I understand that once you have the prokaryotes they can coexist to form eukaryotes and so forth, but I can't seem to find out what that little step is that's missing. Thanks =]
 
Biology news on Phys.org
  • #2
Well, that's somewhat of a mystery. What came 1st the chicken or the egg? :)

It is possible, perhaps, that microspheres and DNA(or RNA) developed independently and then eventually joined together in some sort of symbiotic relationship. Or perhaps DNA managed to form a cellular membrane on it's own? I don't think anyone has a definitive answer to that question...just various postulations.

In other words: who knows? hehe

A number of different theories are listed here: http://en.wikipedia.org/wiki/Origin_of_life"
 
Last edited by a moderator:
  • #3


The origin of the first cells, or the process of abiogenesis, is a complex and ongoing topic of scientific research. While there is still much to be discovered and understood, scientists have proposed several theories about how the first cells may have emerged.

One theory is the RNA world hypothesis, which suggests that the first cells may have been self-replicating RNA molecules. These molecules would have been able to store genetic information and catalyze chemical reactions, similar to how DNA and proteins function in modern cells. Over time, these RNA molecules could have evolved into more complex structures, eventually forming the first cells.

Another theory is the metabolism-first hypothesis, which proposes that the first cells arose through a series of chemical reactions in which simple molecules combined to form more complex ones. These reactions would have been driven by energy from sources such as volcanic vents or lightning strikes. Eventually, these reactions could have led to the formation of self-sustaining, membrane-bound structures that we recognize as cells.

It is also possible that the first cells emerged through a combination of these and other processes. While we may never know exactly how the first cells came about, continued research and advancements in technology will likely provide more insights into this fascinating topic.
 

Related to How did the first cells come about?

1. What is the theory of abiogenesis?

The theory of abiogenesis proposes that the first cells originated from non-living matter through a series of chemical reactions. This process is thought to have occurred around 3.8 billion years ago on Earth.

2. What evidence supports the theory of abiogenesis?

There are several lines of evidence that support the theory of abiogenesis. For example, experiments have shown that simple organic molecules, such as amino acids and nucleotides, can be formed from inorganic components under conditions similar to those on early Earth. Additionally, the discovery of microfossils and the similarities between all living cells suggest a common origin for life.

3. How did the first cells acquire their energy?

The first cells likely obtained energy through chemical reactions with their environment. This process, known as chemosynthesis, involves using inorganic molecules, such as hydrogen sulfide or methane, to produce energy-rich organic compounds. These early cells may have also used the energy from sunlight, a process known as photosynthesis.

4. Did the first cells have DNA?

It is believed that the first cells did not have DNA as we know it today. Instead, they may have used RNA, a simpler molecule that can both store genetic information and catalyze reactions. Over time, DNA evolved as a more stable and efficient way to store genetic information.

5. How did the first cells reproduce?

The first cells likely reproduced through a process called binary fission, where a single cell divides into two identical daughter cells. This process is still used by many single-celled organisms today. As cells evolved and became more complex, sexual reproduction and other forms of cell division developed.

Similar threads

Replies
4
Views
1K
Replies
4
Views
2K
  • Biology and Medical
Replies
5
Views
2K
Replies
6
Views
964
Replies
1
Views
4K
Replies
6
Views
3K
  • Biology and Medical
Replies
3
Views
2K
Replies
1
Views
1K
Replies
6
Views
5K
Back
Top