SBI4U Exam Review Topic 1 1. The table below shows the level of hemoglobin measured in two different groups of athletes. Hemoglobin / grams per 100 cm3 Number of athletes tested Standard deviation / grams per 100 cm3 Group A 12.6 200 0.8 Group B 11.9 220 3.2 Which of the following statements is correct? A. Results from group B are more accurate because more athletes were tested. B. Results from group B are more reliable because it has a higher standard deviation. C.
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Discovering Cells Directions: answer the following questions using complete sentences. Use pages 6C-13C of your textbook. 1. What are cells? 2. When was the first microscope invented? 3. What is a microscope? 4. What is the difference between a simple and compound microscope? 5. Who was one of the first people to observe cells? 6. What did Anton van Leeuwenhoek discover? 7. A Scanning Tunneling Microscope (STM)
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Cell Phones Cell phones have brought a whole new meaning to the word multitasking. You can use the phone while waiting on the bus talking to your friend‚ cooking dinner‚ shopping‚ or even driving in a car all though you should not use your phone in your car. Reality is that these cell phones have made the world a better place and keeps improving it. Although some argue that cell phones have a negative effect on our society‚ cell phones actually provide humans with everything they need. Cell
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History of Cell Theory As we all probably know today‚ every single living being is made up by cells the building blocks of life. As much as we would like to take this fact for granted‚ we cannot help but acknowledge and remember the works and discoveries of earlier scientists which all contributed to our today’s understanding of the cell theory. The cell theory being; all living things are composed of one or more cells‚ cells are organisms’ basic units of structure and function‚ and cells only come
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The Dangers of Cell Phones Our community has increased greatly in technology during the past 20-30 years. Cell phones have given us more freedom and have also given us more freedom and have also given us the ability to communicate with anyone we want at anytime we choose. Cell phones‚ to some‚ are the greatest things invented to mankind‚ but every single thing must have a negative side. What is the negative side of cell phones? Cell phones are a horrible distraction‚ they are said to cause cancer
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The Great Wall of China. an overview Walls and wall building have played a very important role in Chinese culture. These people‚ from the dim mists of prehistory have been wall-conscious; from the Neolithic period – when ramparts of pounded earth were used - to the Communist Revolution‚ walls were an essential part of any village. Not only towns and villages; the houses and the temples within them were somehow walled‚ and the houses also had no windows overlooking the street‚ thus giving the feeling
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Cell phones are the most essential devices used in the 21st century. People are using cell phones now more than ever. The first cellular device was invented in the 1940’s and they have been used till this day. The design is very unique‚ making it top dollar in the store. The development of the cellular device has helped better the people of the United States and throughout the world. Today cell phones are much more modified and abstract in the way their being used. Communication is now distributed
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Are cell phones dangerous? Cell phones are a wonderful thing. You can talk. Take pictures. Listen to music. Converse over email or text messaging‚ and browse the Internet among a handful of other things. I love to use my cell phone and actually use it more then any other phone at the office or at home. However‚ I use it with immense concern. I have concern about the use of the phone causing health issues‚ like cancer and brain tumors over time. Are these concerns warranted? I have studied technology
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The Wall in Robert Frost’s “Mending Wall “ As a Symbol of Division The ordinarily mundane takes a thought arousing spin in one of Robert Frost’s earlier works‚ “Mending Wall”. This poem is a striking take on an otherwise commonplace ritual between two farmers in the spring. Because the poem is in blank verse‚ it carries a casual folksy feel throughout‚ contradictory to its deeper message and paradoxical tone. “Good fences make good neighbors.” This line is a paradox when compared with the previous
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The cells of the adaptive immune system are special types of leukocytes‚ called lymphocytes. There are two main types of lymphocytes‚ B cells and T cells‚ which are derived from hematopoietic stem cells in the bone marrow. T cells are involved in cell-mediated immune response‚ whereas B cells are involved in the humoral immune response. The surface of each lymphatic cell has receptors that enable them to recognize foreign substances. There are two major subtypes of T cells: the helper T cell and
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