MITOSIS What is Mitosis? There are various structures within the cell‚ but many are too difficult to see. For example‚ within the nucleus lie the chromosomes. These are important for heredity and reproduction. When a cell splits and becomes two‚ certain processes occur within the nucleus first. One of these processes involves the splitting of the chromosomes. This process is called Mitosis and there are four distinct stages. Mitosis takes place in Regular Body Cells or Somatic Cell. It keeps
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1. Introduction Welcome to GCSE Biology. This year we will be studying OCR 21st Century science. This is a modular course of 7 units and a piece of coursework. 2. Your Lecturers In the box below write the name of your lecturer‚ the times of your lessons and which rooms they are in. You should also write your lecturers staff room and how to contact them (their office phone number and college e-mail addresses). Lecturer Times & Rooms Contact details 3. Structure of the course
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Nucleolus Nucleolus is present inside the nucleus. The job of nucleolus is to store the information‚ the information stored in the nucleolus is used in the process of making ribosomes. The ribosomes are used to make proteins. Nucleus: The nucleus is the place from where all the activities happening in the cell are controlled. All the cell’s information is stored in the nucleus in the form of DNA and chromosomes. Nucleus is the main centre of the cell and that’s why it is also called as town hall
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GOVERNMENT OF TAMILNADU STANDARD NINE TERM I VOLUME 3 SCIENCE SOCIAL SCIENCE NOT FOR SALE Untouchability is Inhuman and a Crime A Publication Under Free Textbook Programme of Government of Tamilnadu Department of School Education © Government of Tamilnadu First Edition - 2013 (Published under Uniform System of School Education Scheme in Trimester Pattern) Textbook Prepared and Compiled by State Council of Educational Research and Training College Road‚ Chennai - 600
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Andre’ Bertrand Sean Comeaux Biology 1 1st October 2011 Animal Cells Every once living thing is composed of cells. Cells are small organisms that control everything in living things. When an organism is made of one or more cells it is called a multi cellular organism. The first person to discover cells was Richard Hooke. The cells that he saw were the dead cells of cork. When he first saw them they reminded him of the cells that nearby monks lived in. there are many different parts
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Animal cells do not have a cell wall. Instead of a cell wall‚ the plasma membrane (usually called cell membrane when discussing animal cells) is the outer boundary of animal cells. Animal tissues therefore require either external or internal support from some kind of skeleton. Frameworks of rigid cellulose fibrils thicken and strengthen the cell walls of higher plants. Plasmodesmata that connect the protoplasts of higher plant cells do not have a counterpart in the animal cell model. During telophase
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[pic] Five similarities between plant and animal cells are as follows: 1. Both are constructed from eukaryotic cells. 2. Both contain a defined nucleus. 3. Both have mitochondria. 4. Both have Golgi bodies. 5. Both are surrounded by a cell membrane. Three differences are: 1. Plants cells have a cell wall‚ whereas animal cells do not. 2. Animal cells have lysosomes‚ whereas plant cells do not. 3. Animal cells contain centrioles and a cytoskeleton‚ whereas
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Prokaryotic Cell Structure Bacterial Cell Structure Mariana Ruiz Villarreal/Wikimedia Commons Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. As organized in the Three Domain System‚ prokaryotes include bacteria and archaeans. Prokaryotes are able to live and thrive in various types of environments including extreme habitats such as hydrothermal vents‚ hot springs‚ swamps‚ wetlands‚ and the guts of animals. Prokaryotic Cell Structure
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MULTI CHOICE QUESTIONS BIOLOGY 1. First living cells were observed by A) Robert Hooke B) A.V Leeuwenhoek C) Robert Brown D) R.Virchow 2. Well defined nucleus is absent in A) Plant cell B) Animal cell C) Eukaryotic cell D) Prokaryotic cell 3. Which of the following is incorrect pair A) Nucleus-Brain of the cell B) Mitochondria-Power house of the cell C) Chloroplast-Kitchen of the cell D) Lysosome-Secretory granules
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1 pH‚ Protisits‚ and Ponds Everything Pond Water 2 Introduction Humans are surrounded by thousands of bodies of water throughout the world. What makes a lake differ from an ocean? Or what makes a pond different from a lake? A pond is a body of standing water either natural or man made‚ that is usually smaller than a lake. Ponds contain amazing biodiversity‚ providing an environment for birds‚ fish‚ amphibians‚ alages‚ protists‚ and many many more organisms. A pond is normally much shallower
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