Topic 1 - Intro to cell biology (lec 2)

Its phisyology is not that different from humans a

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Unformatted text preview: mall spaces. Shows many of the characteristiscs that human show. Its phisyology is not that different from humans > A Zebra fish (Danio rerio) is becoming more popular for medical research. Work on development, The early stages of the embroynic , it has external fertilization and the eggs are clear, so u can see the embryo. Its genome is sequenced, they are small so u can hold alot of them in the lab. Have a generation time of 3 months. Easy to breed, they breed everyday. The heart cells can heal itself. > The oragnelles that u find in a eukaryote cell. When u look at a eukaryote cell the # of membrane bound should jump out at u. There is a membrane-bound nucleus, membrane-bound organelles, there are membranes all over the place. This is the key charateristic of eukaryote cell. > The membrane-bound organelles are part of the cytoplasm. They are suspended in the cytosol > Cytosol - Is the aqueous solution, the semi liquid solution of salts and organic molecules > Cytoplasm - is the cytosol and everything u find in it, the organelles, the ribosomes, the cytoskeleton >Is the cytosol the same in a eukaryote cell and in a prokaryote cell? Yes it is more and less the same in both the eukaryote and the prokaryote. > Is the cytoplasm the same in a eukaryote cell and in a prokaryote cell? No they are not the same b/c eukaryotic cells have organelles and cytoskeleton in its cytoplasm, where as prokaryotic cells do not. > Non-membrane bound organelles > The ribosomes and the cytoskeleton > the ribosomes in eukaryotic cells are responsable for protein synthesis. The eukaryotic ribosomes are larger and have more subuints, where as the prokaryotic are smaller > the cytoskeleton that u find in eukaryotic cells consists of three different sets of filiamentous structures. The three are Microtubules,Microfilaments and Intermediate filaments. They provide support/structure for the cell, functioning as a transport system within the cell, and responsable for movement of the cell. They are complexes of proteins > The cytoskeleton is not present in prokaryotic cells, they do have proteins that carry out similar functions, but the cytoskeleton is not present. Non-membrane bound organelles Cytoskeleton Support/shape, internal organization, movement of cell, movement within cell Microfilaments, microtubules, intermediate filaments Ribosomes Protein synthesis Microtubule Intermediate filament Microfilament BIO 1140 – SLIDE 13 Fig. 2.18 > In the prokaryote cells the genetic material takes the form of a single naked DNA chromosome, free floating the cytoplasm. In eukaryotic cells the genetic material is contained within the nucleus, the nucleus is bound by a double membrane, two membrane layers. > There are Nuclear pores through that double memebrane layer to allow things to move in and out the nucleus, and things that are moving in a out are ribosomes bits. Within the nucleus u find the genetic material of the cell and it is organized differently in eukaryotic cell and prokaryotic cell. > the outer layer of the nucleus envel...
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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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