Hey guys so i just did my wordle enjoy 😛
The endosymbiotic theory states that chloroplasts and mitochondria are the result of years of evolution initiated by endocytosis of bacteria and the blue- green algae as they did not become digested but becames symbionts living within the host.
Mitochondria- from proteobacteria.
Chloroplasts- from cyanobacteria.
Matthias Jakob Schleiden:-
Studied the structure of the plant cell and wrote “Contributions to Phytogenesis” (1838) in which he stated that differnet parts of a plant organism is made up of cells. He recognized the importance of the cell nucleus and it’s connection with cell division and was also one of the first scientist to accept Darwin’s theory of evolution.
German physiologist who concluded that “all living things are composed of cells and cell products”. Concluded that nails, tooth enamel and feathers ll have cellular origins. He discovered what is now know as Schawnn Cells in the nervous system, discovered pepsin, organic nature of yeast, and coined the term “metabolism”. He also examined “spontaneous generation” and disproved it.
The first to recognize leukaemia cells and built on the works of Theodore Schawnn. He encapsulated his work into the epigram “Omnis cellula e cellula” – every cell originates from another existing cell like it and “Omne vivum ex ovo”- Everything comes from a living thing” He also published work on cell theory which was not his own.
Hey guys so I’m off with a bit of a late start due to the awesome work load I have this semester so you might be getting several blogs back to back within the next few weeks in an attempt to catch up…..
The cell is probably the most fascinated part of evolution, how so you may ask.. well within a single cell there are several processes,all vital for life, which occur simultaneously which is due to the many different organelles found within that cell, taking into consideration that cells are usually measured in nanometres and that’s very small so how could something so small be so big…lets have a look shall we?
So what is a cell? Well a cell is the smallest unit which can perform life functions such as growth, metabolism, stimulus response and replication. Cells come in all colours shapes, sizes and morphology. This variation is due to the cells specificity to it’s function and environment within an organism. Cells may be classified generally as either being eukaryotic or prokaryotic. What does that mean? Well a eukayrotic cell is believed to have evolved from a prokaryotic cell with the major change being the development of a “true” nucleus and membrane bound organelles while prokaryotic have no membrane bound organelles within them and no true nucleus.
The main differences between prokaryotes and eukaryotes are,
Prokaryotic cells firstly:-
- they are usually single cell organism
- encompasses the Kingdom Monera
- no nuclei
- no membrane bound organelles
- 70s Riboomes
- inlcusive of the Kingdoms- Animalia, Plantea, Fungi, Protista
- has a true nucleus
- membrane bound organelles
- 80s Ribosomes
The following link give a simple understanding and comparison of the various organelles present in cells and their function:- Parts of a Cell
All cells differ in the structure and components as mentioned before,what organelles some cells may contain others may lack, however this lack is made up for using various other structures and mechanisms. A classic example of this is a typical animal and plant cells both cell differ recognizably in the structure and organelles they contain.