Give reasons (s) 1- Formaline is used as fixative in preparation for LM examinations 2- Resolution power is difference from magnification power Complete 1- The cells are the smallest …… and …… units in the body. 2- The size of tissue sample for histological preparation is …… in light microscope and ……. in electron microscope. 3- Fixative used in tissue preparation for LM examination is …….. while in EM is …….. 4- Substance used for tissue embedding in preparation for LM examination is
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Cells and our government are alike in many ways‚ both are made up of smaller components which work together to maintain a stable environment. The organelles can be compared to parts of our government in the way they work together. The nucleus is the main organelle in the cell‚ it makes rna and contains dna‚ this is similar to congress because they make laws which is similar to rna. The golgi apparatus packages carbohydrates and proteins into vesicles and export them out of the cell. This can be
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Prokaryotes and Eukaryotes. These two have varying differences between them. Speaking in simple cell biology words‚ prokaryotes are primitive‚ simple organisms that lack membranous cell organelles. The opposite of this are eukaryotes‚ which are advanced and complex organisms having membrane bound cell organelles. Seemingly simple in structure and markedly different from eukaryote and protist organisms‚ prokaryotic cells are believed to have been amongst the first on the Earth and very well may out-survive
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As biologists probed deeper into the microcosm of cells‚ they found an entire autonomous biological system‚ with many organelles which served various functions. The trio consisting of Keith R Porter‚ Ernest F Fullam and Albert Claude discovered the endoplasmic reticulum and published their research paper regarding it‚ in 1945. It was a very important discovery‚ as this cell organelle plays a major role in the functioning of every eukaryotic cell. Let us take a look at the structure of endoplasmic reticulum
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the working of different parts of the body. Question 3: Write short notes on the following. (a) Cytoplasm (b) Nucleus of a cell Answer: (a) Cytoplasm: It is a fluid that fills the cell and occurs between the plasma membrane and the nucleus. Cell organelles such as mitochondria‚ ribosomes‚ Golgi bodies‚ etc. are suspended in the cytoplasm. http://schools.aglasem.com/?p=2307 2/8 8/17/2014 NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and
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between Eukaryotic cells and Prokaryotic cells with particular reference to the characteristics of their: (Nucleus/nucleoid‚ DNA‚ Mitotic division‚ Chromosome number‚ Cell organelles‚ Size of Ribosomes‚ Cell wall structure and composition‚ Peptidoglycan‚ Cell membrane‚ Motility) * List the functions of different cell organelles in eukaryotic and prokaryotic cells Prokaryotes: Prokaryotes are single-celled organisms that lack a nucleus and other internal compartments. Early prokaryotes lived at
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1. Define the terms anatomy and physiology. Explain the principle of complementarity and how it applies to this course. The term anatomy refers to the structure of the body and its parts. Along with the study of the body structure‚ anatomy also refers to how these body parts work together and their working relationship as a whole. Physiology is the study of how the living systems in the body function and work. When studying the Physiology of the body it is most understandable if terms from the underlying
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blood? The cells in the area would have the water sucked out of them by osmosis 9. Why are the proteins that are involved in active transport often called pumps? Because the move substances against their concentration gradient 10. What is an organelle? An organized structure in a cell 11. Which are the members of the endomembrane system? Golgi apparatus‚ lysosomes‚ microbodies‚ and the nuclear membrane 12. a) What two things make up chromatin? DNA and proteins b) What is the difference between
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Nucleus- The nucleus is the control center of the cell. This is where DNA is contained. This is like the town hall or the mayor’s office because it is the control center of a town. The nucleus uses DNA like a city uses blueprints to direct the production of protein. Nucleolus- The nucleolus is where ribosome is made and is rich in RNA content. It is located inside the nucleus. A mayor is like this because the mayor makes everything in the town happen. He also works from the town hall‚ or works
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a) What is a difference between prokaryotic and eukaryotic cells? b) What is one significant similarity? d) Prokaryotic cells are a type of cell that lacks a membrane-bounded nucleus and organelles. Eukaryotic cells are a type of cell that has a membrane-bounded nucleus and membranous organelles. e) The similarities between the two cells are that both are enclosed with plasma membranes‚ contain ribosomes‚ have DNA‚ and are filled with cytoplasm. 3. Which type of microscopy uses
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