sympathetic system (flight/fight action) + the parasympathetic system (relaxation). The Nervous System Function * Transmits information from the environment to the body or from one part of the body to the other through a network of specialised cells called neurons connected to all parts of the body. * Stimuli (messages) are received by sensory neurons, they are passed on to motor neurons (the effectors),
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Page - rtm1 Mitosis in Onion Root Tip Cells A quick overview of cell division The genetic information of plants, animals and ot her eukaryotic organisms resides in several (or many) individual DNA molecules, or chromosomes . For example, each human cell possesses 46 chromosomes, while each cell of an onion possesses 8 chromosomes. All cells must replicate their DNA when dividing. During DNA replication , the two strands of the DNA d ouble helix separate, and for each original strand a new
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How substances cross the cell membrane. A cell’s membrane has many functions including forming a boundary in order to organise the contents and keep them separate from the extracellular environment. Yet in order for the cell to ‘live’ and perform its particular function, it needs to be able to take in substances and nutrients and to get rid of waste products. But with such a vast array of substances in the extracellular environment, it is a difficult task to control the influx and out-pouring of
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Body Corporate: Who Owns Your Genes? Genes are hereditary an are made up of chromosomes you obtain from each parent that forms a person’s DNA which is what give you your individual appearance, traits, behavior and also can detect how vulnerable you can be to certain diseases. Most people when asked who owns our genes would respond we do but in fact a portion of our genes are “owned” or patented by a company. According to dictionary.com, “gene patenting is allowing unique segments of DNA, which perhaps
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When a person says, “sixty-five roses,” one would think that they literally mean sixty-five roses, but in reality they are talking about one of the most life threatening diseases – cystic fibrosis. While this nickname may seem like it has some dark history behind it, it actually does not. The story behind this is that in 1965, Mary G. Weiss, a volunteer for the Cystic Fibrosis Foundation, was making calls about financial support for CF research because her three little boys had CF. After she had
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is an area inside the cell that contains the nucleic acids, protecting them by separating the genetic code from the cytoplasm, and keeps the cytoplasmic activity from interfering with any genetic material. Inside of the nucleus, proteins work together to copy parts of the deoxyribonucleic acids to the ribonucleic acids. This process of adding some of the DNA to the RNA is called transcription (Inside a Cell). The job of the nucleus is to coordinate all the activity of the cell, including growth, reproduction
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1.03 Tissues 1. Explain how cells specialize to form specific tissue and organs. We all used to be one cell. Once our cells were fertilized with sperm, the single cell repeatedly divides itself into multiple cells. These cells organize themselves into 3 layers that will specialize and determine their locations. Tissues are basically a group of similar cells that bunch up together to create systematic structures, which eventually end up creating a functioning bodily system. The article states how
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How DNA is packed in the nucleus of an eukaryotic cell 1) Introduction DNA, deoxynucleic acid, is known to be able to condense to form a smaller structure known as chromosomes. However, it is hard to imagine how does a 2m long DNA molecule can be packed into something which only have a rough diameter of 10µm in the eukaryotic cell. This report provides an overview on how DNA is packed in the nucleus of an eukaryotic cell. It will cover the structure of the human DNA, levels of packing the DNA and
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Mitochondrion is the powerhouse of the cell. It generates energy in the form of ATP by breaking down glucose molecules. The outer membrane is freely permeable which allows the passage of ions, nutrient and energy molecules. The inner membrane, contrarily, is strictly permeable. It is permeable only to oxygen and ATP. It is folded into a number of folds, which is known as the cristae. The cristae contain proteins and molecules which aids in the production of ATP molecules. The main function of the
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Design and Life Cycle Cost Analysis of Off-Grid Photovoltaic Power Systems Mounir Bouzguenda, Abdelkader Tami, Azzeddine Ferrah, and Jihad Al-Khalaf Faculty of Engineering, Sohar University PO Box 44 PC 311 Sohar-Oman Tel: +968-820-101 ext 233 Email:m.bouzguenda@soharuni.edu.om Abstract--The interest in off-grid photovoltaic (PV) solar energy systems in villages and remote areas is increasing. This interest stems from several factors such as improvement in living standards, reduced capital
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