Brain of the Cell The nucleus is literally a membrane-bound organelle and is surrounded by a double membrane. I feel that the nucleus is of the greatest importance in the cell because it is the control center that oversees the metabolic functioning of the cell and it directs all the cells activities. The nucleus is like the head of the cell and without a head the rest of the body is useless. It is the largest organelle and within the nucleus is the DNA responsible for providing the cell with its unique
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The Onion Cell Lab Background: Onion tissue provides excellent cells to study under the microscope. The main cell structures are easy to see when viewed with the microscope at medium power. For example‚ you will observe a large circular nucleus in each cell‚ which contains the genetic material for the cell. In each nucleus‚ are round bodies called nucleoli. The nucleolus is an organelle‚ which synthesizes small bodies called ribosomes. Ribosomes are so small you cannot see them with the light microscope
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CELL DIVISION REVIEW 1. Name the phase of interphase in which cells copy their DNA. G-2 2. Anaphase 3. Name the phase in which spindle fibers disappear. telephase 4. Put the following cells in the correct order. A interphase B telephase C anaphase D prophase E metaphase 5. centromere 6. DNA that is spread out in the nucleus of a non-dividing cell is called chromatin. 7. Name the phase this cell is in. 8. Name
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provided. 3 4 5 6 TOTAL This document consists of 15 printed pages and 1 blank page. SP (NF/CGW) S86392/2 © UCLES 2005 [Turn over For Examiner’s Use 2 Answer all the questions. 1 Fig. 1.1 is a drawing made from an electron micrograph of a goblet cell from the epithelium of the gas exchange system. mucus ’plug’ vesicle containing mucus A B C Fig. 1.1 (a) Name A to C. A ..........................................................................................................................
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Cell Analogy A Nucleus is like the city hall. The Nucleus directs the activities of all organelles. The City hall controls all activity that occurs in the city. The mitochondria are like the power plants. The mitochondrion converts chemical energy into energy for the cell. The power plants provide energy to all parts of the city. The vacuole is like the land fill. The vacuole stores materials containing water‚ food‚ or waste. The land fill stores harmful waste products safely. The Golgi
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CELL THEORY – STEM CELLS Stem cells are a large focus of study in today’s biomedical world. “They are cells that exist in an undifferentiated state‚ and transform into differing tissue types depending on what the cells surrounding them are‚“ (National Institute of Health‚ 2012). Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition‚ they also serve as an internal repair mechanism inside many tissues‚ dividing without
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Title: To examine an animal and cheek cell using a compound microscope Date: 25th September 2012 Lab Partner: xxxxxxxxxxxxx Objective: The main aim of this experiment was to prepare a wet mount of human cheek cells and a wet mount of plant cells and examine them both under a compound microscope. Introduction: Cells are the basic units of life which make up every structure in the human body. They are the smallest units which are living. All cells contain different organelles which
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plasmoylsis and turgor in plant cells Investigation * Get a single layer of plant cells. If you are using red onion‚ cut a 1 cm square from a fleshy piece of onion and then peel off a single layer of the red cells. If you are using rhubarb‚ peel a piece from the epidermis. If you are using toadflax peel a piece of the lower epidermis of a leaf. * Place the strip on a slide and cover it with a drop or two of distilled water. Add a cover slip. * Look at the cells through a microscope. Start
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potentials in neuron and muscle cells c. Secretion and action of hormones and neurotransmitters d. Muscle contraction 9. Osmosis: When more solute particles are added to one side of a container with a selectively permeable membrane‚ which way will the water move? From the side with more water and less solute to the side with less water and more solute. 10. What happens to a patient’s red blood cells when the following solutions are given: a. Hypotonic solution The cell will bust or haemolyse b.
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potentials in neuron and muscle cells c. Muscle contraction d. Secretion and action of hormones and neurotransmitters 9. Osmosis: When more solute particles are added to one side of a container with a selectively permeable membrane‚ which way will the water move? From the left to the right. 10. What happens to a patient’s red blood cells when the following solutions are given: a. Hypotonic solution: Water moves into cells and they expand.
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