Today I will story about what I have learnt in week 4. Cell theory. There are two type of cell theory which is traditional and modern cell theory.
Traditional Cell Theory
- All living things are composed of cells.
- - The basic unit of structure and function in
living thing are cells.
- - New cells are only produced from existing cells.
-
Modern Cell Theory :
- - Studies of biochemistry and metabolism proves
that energy flow occurs within all cells.
- - Cells contain hereditary information (DNA) that
is passed from one cell to another cell during reproduction.
- - All cells are basically same in chemical
composition in organisms of similar species and same metabolic activities.
-
There are many scientist that knownly have a lot of contribution to
cell theory. In our scl activities, we were assigned to find out about sveral
scientist. Actually, I have
drawn several illustration of their discovery. Below are picture about their contribution,
date of discovery and the illustration. Please do not laugh because Im not good
in drawing or anything related to it (hate it) :(
Just
in case if you all can not see clearly. First is Robert Hooke. Second is Anton
Van Leeuwenhoek. Thirdly is Theordor Schwann and lastly is Rudolf Virchow.
I also learnt about prokaryotic and eukaryotic cells. These are the
sructures and the differences between both of them.
Well if i have tell you about the similarities and differences of prokaryotic and eukaryotic cells, you need to spend all day reading my blog. Okay just kidding. The main thing is both of them are composed of cells, the basic unit of life, with each cell are surrounded by a cell membrane. That is it !
Next, Dr taught about virruses, prions, and viroids. I considered that all human know what virus is. Come on guys :/ It is sure something that can infect human, animals, plants and even the bacteria. And yes they are considered as non-living things. From what I remembered, they are extremely small in size, and we can only see them through advanced electron microscope ( it is expensive yeah ).
What is prions ? Prions is an infectious agent that is composed primarily protein or the simple word is an infection protein. Prion disease ---> Alzheimer's and Parkinson's Diseases. And for your information research shown that ginko biloba can help in Alzheimer's diseases. Not cure completely but only slow down, something like that.
Viroids is small RNA ( naked and unprotected that do not code for any proteins ) that effect plants. But until now, there are no proves that show the effect of eating plants that infected by viroids to the humans. Maybe someday I want to observe and explore more about it.
Thankyou all !
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