Topic 1 - Intro to cell biology (lec 2)

These are a series of flaten sacs and tubes it comes

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Unformatted text preview: ope is contineous with another membranous structure called the Endoplasmic reticulum (ER). These are a series of flaten sacs and tubes, it comes in 2 different types: 1) Rough ER : the walls of the ER are studded with ribosomes, this serves as a major site for protein synthesis. 2) Smooth ER: This lacks riboaomes. Serves as a site for lipid synthesis and detoxification. It is imporatnt in cells that break down compounds Membrane bound organelles Nucleus Nuclear envelope Nuclear pores Nucleolus DNA and protein organized into chromosomes (chromatin) Endoplasmic reticulum Tubular membranes and cisternae Rough – ribosomes, for membrane protein and secreted protein synthesis Smooth – for lipid and steroid synthesis, detoxification BIO 1140 – SLIDE 14 Golgi complex See Fig. 2.8 Stack of flattened vesicles Sorting, modification and packaging of proteins Nucleus Vesicles Rough ER Transport among organelles and/or to plasma membrane Lysosomes, peroxisomes Vacuole Contain hydrolases, catalases Golgi complex Vesicles Temporary storage Turgor pressure in plant cells Lysosome BIO 1140 – SLIDE 15 Fig. 2.16 > Protein that are synthesisized in the rough ER typically than move to another membrane structure the Golgi complex. They move from one to another by means of small, membrane bound vesicles. > Vesicles are small, single membrane bound organelles that suttle things around in the cell. They can suttle proteins from rough ER to the golgi complex, they can also suttle proteins from the golgi complex out to the membrane of the cell, if those proteins are going to be secreated from the cell. > The Golgi complex itslef is another set of flaten sacs and it is an importanst site of protein modification and sorting. Proteins that are synthesisized in the rough ER are than sent to the Golgi complex for further modification. This can involve taking a long protein and breaking it into smaller sub sections. It can involve adding tags, so the protein can be sent to the right place in the cell. This process of modifing the proteins, sorting them and than sending them off to the approperate location takes place in the Golgi complex. > Lysosomes, peroxisomers these are small, single membrane bounded organelles. They are involved in breaking down compounds. They contain enzymes that break down different types of bonds. Lysosomes contain hydrolases, and peroxisomers contain catalases, and they serve a varity of functions interms of breakdown. > Vacuoles are similar to lysosomes, that take place in amimals. They function as temporary storage. But vacuoles are more known in plant cells. > The Vacuole is much better known in plant cells. In plant cells you have a large central vacuole and this plays a really important role in the plant acheving Turgor pressure. When a plant is short on water the central vacuole sezies to exert pressure on the cell contents resulting in limp or wilted plants. When u water the plant the central vacuole fills up with water and it exertes pressure on...
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This note was uploaded on 02/19/2014 for the course BIO 1140 taught by Professor Fenwick during the Winter '07 term at University of Ottawa.

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