Questions of this chapter: **Definition Cell cycle 2. Homologous Chromosome 3. Sister Chromatid 4. Synapsis **Short Questions 1.Describe the chief events of mitosis and show how these differ from meiosis. (V.V.I.) 2. What ‘checkpoints’ occur in cell cycle? What is the role of each? **Long Questions 1.Describe the phases of the cell cycle and the events that characterize each phase. Answer of short Definition is given below 1. Cell Cycle: The cell cycle is an orderly sequence of events
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The cell cycle‚ or cell-division cycle‚ is the series of events that take place in a cell leading to its division and duplication that produces two daughter cells. In cells without a nucleus‚ the cell cycle occurs via a process termed binary fission. In cells with a nucleus‚ the cell cycle can be divided in three periods: interphase—during which the cell grows‚ accumulating nutrients needed for mitosis preparing it for cell division and duplicating its DNA—and the mitotic phase‚ during which the
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Why are Cell Phones Dangerous? Why are cell phones dangerous? Cell phones are what people use in their everyday lives throughout the 21st century. Cell phones have been around since the 1980’s. Cell phones are being used from young kids to elderly adults. All around the world there are cell phones . There has have been many researches and court cases on how cell phones are dangerous and what kind of damage it they can do to people. There was a case on a man who blamed cell phones in the
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Review Sheet Exercise 1 Cell Transport Mechanisms and Permeability Activity 1: Simulating Dialysis (Simple Diffusion) • Describe two variables that affect the rate of diffusion: Two variables that affect the rate of diffusion are size and concentration gradient. The molecular size vs the MWCO size of the membrane can either increase‚ decrease‚ or prevent diffusion. The greater the concentration gradient the greater the diffusion rate due to molecules moving from areas of higher concentration
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Hannah Patricia B. Tan IV – Electron A MODEST PROPOSAL: FOR PREVENTING TERRORIST ATTACKS AND EASIER AIRPORT SECURITY MANAGEMENT A lot of terrorist attacks have been happening around the world. These attacks cause trauma and shock to a lot of people‚ especially those who are affected. Some terrorists threaten people by doing bomb threats which destroys the infrastructure‚ some kidnap valuable people and treat them as hostages to get ransom‚ and sometimes they kill those people if they do not
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GROUP 6 ANIMAL CELL and It’s Functions ANIMAL CELL: About animal cell usually have an irregular shape. are eukaryote cells‚ or cells with a membrane bound nucleus. DNA is housed within the nucleus. Also contain other membrane bound organelles‚ or tiny cellular structures that carry out specific functions necessary for normal cellular operation. smaller than plant cells. Cell Membrane is the outermost component of a cell. it is composed of 55% proteins‚ 25% phospholipids
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Cell Phone and Social Graces Have you ever talk to someone and they did not reply because they are busy playing on their cell phone? We all have that experience. We cannot blame on the cell phone because people are responsible for their behavior. In the essay “ Cell phone and social graces”‚ Charles Fisher elaborates on the use of cell phone and shows how careless‚ sometimes inconsiderate‚ and needy most people are when using their cell phones. Charles Fisher pointed out the negative when people
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Weismann‚ who noted that two cell divisions were necessary to transform one diploid cell into four haploid cells if the number of chromosomes had to be maintained. In 1911 the American geneticist Thomas Hunt Morgan observed crossover in Drosophila melanogaster meiosis and provided the first genetic evidence that genes are transmitted on chromosomes. The term meiosis was introduced to biology by J.B. Farmer and J.E.S. Moore in 1905 Meiosis i/maɪˈoʊsɨs/ is a special type of cell division necessary for
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Commercial Cells Galvanic Cell A Galvanic cell is also known as a Voltaic cell. It was named after Luigi Galvani and Alessandro Volta. A galvanic cell is capable of producing an electric current from a redox reaction that occurs within it and consists of two half cells. Each half cell consists of an electrode and electrolyte and a salt bridge. In a galvanic cell one metal can undergo reduction and the other oxidation. A typical galvanic cell is based on the spontaneous redox reaction: Net Ionic
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Evolution of Sickle Cell Sickle Cell was discovered in the United states although it originated in Africa . The sickle cell disease (SCD) describes traits of an inherited red blood cell disorder‚ having SCD means you have abnormal hemoglobin‚ called hemoglobin S or sickle hemoglobin‚ in your red blood cells. What is hemoglobin u might ask?! Well Hemoglobin is a protein in red blood cells that is suppose to carry oxygen throughout the body. But when a sickle cell trait is “Inherited” it could
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