Well the class was on the day that we were going to go back to our hometown for Hari Raya Korban, so yep, I was a little bit distracted hehehe I was not really focus.
But the class was about the cell wall topic. Functions of the cell wall,
- Prevent bacterial cell from rupturing when the water pressure inside the cell is greater than that outside the cell
- Contributes to pathogenicity
- Classification maintains characteristic shape
- Provides a rigid platform (a point of anchorage)
- Counters the effects of osmotic pressure
2 major types of cell wall are gram positive and gram negative. Gram negative consist of outer membrane that makes the gram negative become more pathogenic as it is resistant to certain antibiotic (penicillin), lysozyme, detergent, heavy metals, bile salts and certain dyes.
Gram positive consists of techoic acid – makes the Gram positive cell wall acidic – cell walls do not degrade as easily.
(Roughly about cell wall)
We proceed to intracellular structures of prokaryotes. My favourite part is on plasma membrane. I love this topic since secondary school. To be more specific, the movement of materials across plasma membrane. There are active process and passive process. Active process requires energy because the materials move from lower concentration region to higher concentration region. Active process includes active transport and group dislocation. Passive transport does not require energy as the materials move from higher concentration regionto lower region. It includes osmosis, facilitated diffusion and simple diffusion.
We also discussed about ribosomes, cytoplasm, nucleoid and plasmid. Dr Wan gave us a short assignment. We must label the picture and list down the functions for each organelle.
And yeay, the end of classsssss. So excited eventhough it is only a short holiday.
(We asked Dr Wan to bring rendang for us on our next class! Yeay can't wait!)
That's all :)
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