The genes and proteins involved in cell cycle regulation in prokaryotes and eukaryotes are very

The genes and proteins involved in cell cycle regulation in...

Key Concepts

Convergent Evolution

This concept refers to the independent evolution of similar traits or processes in organisms that are not closely related, typically because they faced similar environmental challenges or selective pressures. In the context of cell cycle regulation, both prokaryotes and eukaryotes have developed similar molecular reactions to coordinate DNA synthesis with cell division despite originating from different gene and protein pools.

Selective Pressures

Selective pressures are forces in the environment that influence the survival and reproduction of organisms. The necessity for accurate coordination between DNA replication and cell division represents a critical cellular challenge, and similar selective pressures in both prokaryotes and eukaryotes have driven the evolution of analogous regulatory mechanisms.

Molecular Regulatory Mechanisms

These are the biochemical processes that ensure the proper control and timing of essential cellular events, such as DNA synthesis and cell division. The occurrence of similar regulatory reactions in both groups, despite differences in the specific molecules involved, underscores that certain regulatory strategies are highly effective solutions to universal cellular requirements.

Transcript

00:02 Number 16 says the genes and proteins involved in cell cycle regulation and prokaryotes and eukaryotes are very different.

00:10 However, both types of organisms use similar molecular regulatory reactions to coordinate dna synthesis with cell division.

00:17 What does this observation mean from an evolutionary perspective? so from an evolutionary perspective, we have to look at this over, you know, hundreds of thousands of years and look at the patterns and the similarities and how these cells actually produce dna and how these cells actually divide.

00:37 And so what's interesting when you look at eukaryotic division and prokaryotic division, there are some very stark similarities, and one of those happens to be dealing with this question of dna synthesis.

00:50 And so the way in which these prokaryotes and eukaryotes actually replicate their dna, where we actually make an exact, copy of this dna in a process called dna replication is actually nearly identical.

01:09 And so some of the molecules that we find in these eukaryotes are actually the same as what we find in the prokaryotes when dna is being synthesized or produced.

01:19 The other thing that becomes extremely interesting is when you look an example of a prokaryote, now remember prokaryotes are basically these cells where the dna is just kind of floating around in there.

01:31 And so we don't have a clearly defined nucleus.

01:33 We don't have membrane bound organelles.

01:36 And so generally we just find dna in the cell itself.

01:41 Well, when we look at the division that occurs in these particular cells, they divide by a means of what's called binary fission.

01:52 And so essentially, the cells line up this dna in a manner where it can be equally distributed on each side.

02:00 And they divide.

02:03 And it's a pretty simple process where the cell membrane splits.

02:06 We get the same number of dna on both sides in a normally functioning division...