1. Introduction Microscopy is an essential technique not only in cell biology but natural science as a whole. We compared different types of microscopic techniques ‚ according to the specimen used and the scope of the experiment. Two specimens‚ stained and unstained‚ containing CHO cells‚ were prepared‚ examined and analyzed under the microscope using bright field (HF)‚ dark field (DF) and phase contrast (PH) settings. In addition‚ the four phases of cell division cycle were estimated.. Bright
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Breeding Techniques Inbreeding: This is basically keeping a strain pure. The fish are kept closely related and brother and sister‚ father and daughter are routinely bred. A breeder will do this sometimes to fix a trait‚ such as a particular colour or shape. Mostly‚ you take the best male and female from the drop and breed them. Doing this can provide beautiful fish for years‚ provided the fish that you start out with are quality and you are lucky enough to choose not only the most attractive fish
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Biology 12 - The Cell Part A: In ONE sentence‚ in the space provided‚ describe the function of the following organelles. Use point form. Use your own words. Paraphrase and condense the textbook definitions. DO NOT copy any definition or part of a definition. In the box to the left of each definition‚ make a sketch of the organelle. |SEE NOTES |1. cell membrane: control what goes in and out of cell‚ forms barrier with outside environment |
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chromatin. 7. Name the phase this cell is in. 8. Name the phase of the cell cycle in which cells spend most of their time doing their job. interphase 9. Name these structures that pull the chromosomes apart during cell division. microtubules 10. Name three things that limit cell size. Cell membrain 11. How do plants and animals differ in cytokinesis? They have different amounts of chromosomes 12. Phase of the cell cycle in which the cell makes molecules and organelles needed for
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Organelle |Function |Location | | |Cell (plasma) membrane |Composed of proteins and a bilayer of lipid. |Outermost boundary of cell (animal) | | |Holds the contents of the cell in place. | | | |Regulates the movement of materials into and out of the cell using the |
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tub1 and tub3‚ and one for β-tubulin‚ termed tub2. These heterodimer proteins‚ which polymerize to form microtubules in most cells‚ have‚ unlike actin‚ been observed as structures that are involved in cell division by chromosomal and nuclear movement (Schatz‚ et al.‚ 1986). The mitotic and meiotic spindle found inside the cell‚ during division‚ have been found to be composed of these microtubules‚ and these spindles are presumably involved with the chromosomal separation and nuclear elongation. The
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In Biology 1115‚ I learned a great deal about cytoskeleton. I have been able to recognize the functions of molecular structures which are microtubules‚ microfilament and intermediate filaments‚ but I still have confusion about those structures. For example‚ I always misunderstand the differences between microtubules and microfilament. Therefore‚ I got wrong in some multiple choices of this midterm. I went back to the notes and read them again after seeing my midterm which can help me to clarify and
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mitotic spindle begins to form. Also the duplicated chromosomes are identical sister chromatids that are connected at the centromeres. Prometaphase is where the nuclear envelope fragments. The chromosomes become more condensed‚ and some of the microtubules attach to the kinetochores. In metaphase is the longest stage that occurs in mitosis. The centrosomes are at opposite poles of the cell now. Also the chromosomes convene on a metaphase plate between the two poles. Anaphase is the shortest phase
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disappearance of the nuclear envelope and nucleoli‚ the migration of the centrosomes toward opposite poles and the construction of spindle apparatus‚ which are composed of protein fibers called microtubules. The next stage is called metaphase‚ where the chromosomes line up at the middle of the cell because the microtubules push and pull them there. The third stage‚ anaphase‚ consists of sister chromatids separating and being pulled toward opposite poles. The last phase of mitosis is telophase‚ which is when
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Bio Review – Cells Cell Theory 2.1.1 * All living things are made of cells * Smallest unit of life * Existing cells from pre-existing cells * Contain a blueprint for growth‚ development‚ behavior * Site of all chemical rxns 2.1.2 * Abiogenesis * Living from non-living matter * Robert hook * Compound microscope + observed cork “cells” * Anthony van Leeuwenhoek * Observed blood cells and other “living” cells * Louis Pasteur * Proved
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