Biologist Lynn Margulis in 1967 and was later published in her book. With these findings the theory that life arose billions of years ago from a simple microbe similar to a prokaryote cell has been thought right. The theory basically states that some organelles in a eukaryotic cell were once prokaryote molecules. The idea is that the first eukaryote was probably an amoeba-like cell with a nucleus formed from a piece of the cytoplasm membrane pinched off around the chromosomes. It was thought that some
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Cells must move materials through membranes and throughout cytoplasm in order to maintain homoeostasis. The movement is regulated because cellular membranes‚ including the plasma and organelle membranes‚ are selectively permeable[1]. The purpose of an automatic flow of molecules is to create equilibrium on each side of the membrane. In order for molecules to pass through the membranes‚ there must be pores. The size of the pore determines what molecules can cross. Due to the size and polarity‚ only
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Produced by cell clusters in the pancreas called the Islets of Langerhans‚ insulin is a hormone that regulates glucose concentration in the blood. It is a protein synthesised and stored by beta cells‚ which secrete it in surges responding to changes in glucose levels. (Hardin‚ Bertoni and Kleinsmith‚ 2012) Fig 1. The Pancreas and Insulin |Source: University of Maryland (2011) | | |
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builds on the work of early scientists. 6. In what way are cells similar to atoms? 7. Suppose a certain poison kills human cells by blocking pores in the nuclear membrane. Explain why it would or would not kill bacteria. 3.2 Cell Organelles: 8. What are the differences between
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Differential expression of genes 1-2 Which of the following structures is not normally found in the cytoplasm of a resting cell? DNA Messenger RNA (mRNA) Ribosomal RNA (rRNA) Transfer RNA (tRNA) 1-3 Which of the following cytoplasmic organelles are not found in most all nucleated cells? Endoplasmic reticulum Golgi apparatus Mitochondria Myofilaments 1-4 Which of the following is the primary purpose of mitochondria? Maintenance of cell shape Modification of proteins Production
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Definition/comparison questions Evolution / Selection Evolution is a slow continuous process of change that happens in plants and animals over a long period of time resulting in a change from simpler to more complex forms. This is the reason modern day plants and animals are different from those of past. The competition for resources will favour organisms with better adaptability and certain variations over others hence leading to change in the rate of occurrence of certain traits within that population
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A Detailed Lesson Plan in Biology I . Objectives At the end of the lesson‚ the students should be able to : 1. distinguish cellular structures; 2. distinguish the functions of each structures; 3. familiarize what the cell looks like and 4. compare the factory to a cell II . Topic: Cellular structures and functions Skill: describing‚ explaining‚ illustrating Materials: pictures‚ photocopied materials and video clip (cell biology) References: • Aquino‚ Jesunino R. et. al‚ Biology
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Cell Parts and Functions Table | Cell Organelle | Cell Function | Nucleus | Directs all cell activities "Brain or Control Center of cell" | Nuclear Envelope (Membrane) | Controls what passes in and out of the nucleus | Cytoplasm | Jelly-like substance found inside cell that acts as a medium for chemical reactions within the cell | Golgi Body (Apparatus) | Packages the proteins made by the ribosomes so they can be sent out of the cell. The UPS store of the cell | Mitochondrion | "powerhouse
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Cell: The cell is the basic structural‚ functional and biological unit of all known living organisms. Cells are the smallest unit of life that is classified as a living thing‚ and are often called the "building blocks of life". Discoverer: The cell was discovered by Robert Hooke in 1665. The cell theory‚ first developed in 1839 by Matthias Jakob Schleiden andTheodor Schwann‚ states that all organisms are composed of one or more cells‚ that all cells come from preexisting cells‚ that vital functions
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Metabolism In science‚ a theory? * Encompasses many hypotheses Bioethics is a branch of biology concerned with? * The development and consequences of biological technology. The Organization of Life 1. Atoms 2. Molecules 3. Macromolecules 4. Organelles 5. Cells 6. Tissue 7. Organs 8. Organ Systems 9. Organism 10. Population 11. Species 12. Community 13. Ecosystem Atoms are joined together into complex clusters called? * Molecules The most basic level is that of __________‚ which
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