Define Stem Cells and give background information on them. Stem cells are a class of undifferentiated cells that are able to differentiate into special cell types. There are two types of Stem Cells: Adult Stem cells and embryonic stem cells. Embryonic stem cells come from embryos that are 3-5 days old. They are often taken from the umbilical cord. They are used more than adult stem cells. Adult stem cells mainly come from bone marrow. Their primary function is to maintain homeostasis by replacing
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Cells and Tissues 1. Which of the following is NOT a membranous organelle? a. Lysosomes b. Peroxisomes c. Mitochondria d. Ribosomes e. Endoplasmic reticulum Answer: d 2. Which organelle contains digestive enzymes? a. Rough endoplasmic reticulum b. Smooth endoplasmic reticulum c. Lysosome d. Golgi apparatus e. Mitochondria Answer: c Lysosomes are membrane bound sacs of digestive enzymes. They are nicknamed "suicide sacs". 3. Which organelle is considered the powerhouse
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8.1.1 The Eukaryotic cell cycle 1. If a cell is in a state in which it no longer divides then the cell is probably arrested at which stage of the cell cycle? A) G1 2. Interphase of the cell cycle lasts longer than mitosis? A) TRUE - A cell spends about 90% of its life in interphase of the cell cycle‚ while it spends only about 10% of its life in M phase. 3. When does DNA replication occur in the cell cycle? A) Interphase 4. Which statement about the cell cycle is incorrect? C) In G2
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Name: Jenny Rose A. Semaning Date Due: July 6‚ 2012 Co-workers: Adelfa Masculino Date Performed: June 29‚ 2012 Farrah Belle Barredo Experiment 2 The Cell Membrane Abstract The boundary between any cell and its environment is the plasma membrane‚ composed of a matrix of phospholipid molecules along with a number of different kinds of proteins. Membranes have different properties and a variety of functions‚ in large part determined by the specific proteins within the membrane
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Virtual Lab: The Cell Cycle and Cancer Worksheet 1. In which phase of mitosis do each of the following occur: a. Centromeres split and chromosomes move toward opposite sides of the cell- Anaphase b. Chromatin coils to form visible chromosomes - Prophase c. The nuclear membrane disappears- Prophase d. Sister chromatids line up in the center of the cell- Metaphase 2. In which phases of mitosis are sister chromatids visible‚ and attached to each other at the centromere? Metaphase
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Blood Cells Leukocytes (WBC’s) Leukocytes also known as white blood cells (WBCs) are cells which play a defensive roll in the body against injury and infection. They migrate towards tissues where they are needed and become functional performing various activities. WBCs can be divided into 2 groups: Polymorphonuclear granulocytes and mononuclear agranulocytes. Both types are spherical while suspended in blood plasma but when they invade tissues after leaving the blood vessels they become amoeboid
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Chapter 5 Membrane Structure and Function Winter wheat is planted in the early fall‚ grows over the winter when the weather is colder‚ and is harvested in the spring. As the temperature drops from fall to winter‚ the makeup of the plasma membrane of winter wheat changes. Unsaturated fatty acids replace saturated fatty acids in the phospholipids of the membrane. Why would colder weather select for the different lipid makeup in the plasma membrane? An abstract in the Canadian Journal of Botany
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Cell’s July 18‚ 2011 Sickle cell anemia is an inherited blood disease that means you are born with it and it lasts a lifetime. People with sickle cell anemia inherit two variant or sickle cell genes‚ one from each parent. In the United States‚ sickle cell anemia affects about 72‚000 people. About 2 million Americans carry the sickle cell trait but about 1 in 12 African Americans have the trait. The signs and symptoms of sickle cell anemia are different in each person. Some people
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Sickle Cell Anemia is a hereditary disease that changes the smallest and most important components of the body. A gene causes the bone marrow in the body to make sickled shapes‚ when this happens; it causes the red blood cell to die faster. This is what causes Hemolytic Anemia. Older children and adults with sickle cell disease may experience a few complications‚ or have a pattern of ongoing problems that shorten their lives. The most common and serious complications of sickle cell disease are anemia
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Sickle cell disease is present usually in those of African or Mediterranean descent (Saladin 2007). About 1.3% of African Americans have sickle cell (Saladin‚ 2007). Sickle cell was originated in Africa where malaria was killing a vast number of people (Saladin‚ 2007). The sickle cell hemoglobin is not able to be digested by the parasites that cause malaria‚ making those with sickle cell resistant to malaria (Saladin‚ 2007). This paper will discuss a normal erythrocyte compared to an erythrocyte
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