where information passes from one cell to another. Scientist isn’t sure if the build up of the beta-amyloid is result from the disease or is what is causing the disease. In normal brain tissues there is a protein called tau and it stabilizes microtubules. Microtubules are key parts of cell structure. In a dead brain‚ these protein strands become tangled. As a result of then tangling the nutrients cannot travel across them. Without critical nutrients the brain cells die. Memory and thinking depend on signals
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Cell Biochemistry BOI103 Lecture 1 Introduction to the Study of Cell Course: CELL BIOCHEMISTRY (BOI 103) Type: Compulsory Total Units: 3 (3 x 1 h lecture per week) No. of Lectures: 42 Lecturers: 1. Prof. Dr. K. Sudesh Kumar Room 402‚ Block G09A PPSKH Tel: 6534367 Email: ksudesh@usm.my 2. Dr. Rashidah Abdul Rahim 3. Dr. Chew Bee Lyn Objectives: Introduction to cells‚ organelles‚ molecules; structure & function relationship; working of a cell Course
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Using Kanamycin Resistance Bacteria to find the Sources of Contamination of Three Chicken Farms Introduction: Kanamycin is a common antibacterial that interferes with bacterial growth‚ by inhibiting protein synthesis‚ and causing the mistranslation of mRNA. Kanamycin is commonly used in chicken feed to keep harmful bacteria from getting into the eggs and producing healthier chickens. Recently reports of severe gastroenteritis have been linked to eating raw or undercooked eggs. This has led to
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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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Unit II Test Review Chapter 4 BB Notes Cells Under the Microscope Cells are microscopic in size. Although a light microscope allows you to see cells‚ it cannot make out the detail that an electron microscope can. The overall size of a cell is regulated by the surface-area-to-volume ratio. 4.2 The Plasma Membrane The plasma membrane of both prokaryotes and eukaryotes is a phospholipid bilayer. The phospholipid bilayer regulates the passage of molecules and ions into and out of the cell. The
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I. Introduction A. Importance of systems B. The major systems 1. List all the systems a. Circulatory System b. Integumentary System c. Skeletal System d. Muscular System e. Nervous System f. Endocrine System g. Lymphatic System (Immune system is a part of this) h. Respiratory System i. Digestive System j. Excretory System (Urinary system is a part of this) k. Reproductive System C. Systems to be discussed 1. Circulatory System (NCES) 2. Integumentary System 3. Skeletal System 4
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Comparison chart | |Phloem |Xylem | |Function: |Transportation of food and nutrients such as |Water and mineral transport from roots to aerial| | |sugar and amino acids from leaves to storage |parts of the plant. | | |organs and growing parts of plant. This movement|
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mitosis. First‚ the proteins that bind sister chromatids together are cleaved‚ allowing them to separate. These sister chromatids turned sister chromosomes are pulled apart by shortening kinetochore microtubules and toward the centrosomes to which they are attached. Next‚ the nonkinetochore microtubules elongate‚ pushing the centrosomes apart to opposite ends of the cell. • Telophase: In this final stage of Mitosis‚ the sister chromosomes attach at opposite ends of the cell. A new nuclear envelope
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and describe the phases of Meiosis 1. A: Metaphase I - Paired homologues move to the center of equator of the cell. Anaphase I - The homologues seperate from each other and get moved to opposite poles by kinteochores. Telophase I - Spindle microtubules dissappear‚ cytokinesis occurs‚ and the nuclear envelope reappears. 2. Describe homologue pairing and crosing over. At which stage of meiosis do they occur? A: When two homologous chromosomes come together before division‚ it’s homologue pairing
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Supply energy to the cell. | | Vacuole | A fluid filled sac used for the storage of materials needed by a cell. | | Lysosome | Membrane-bound organelles that contain enzymes. | | Centriole | Cylinder-shaped organelles mad of short microtubules arranged in a circle. | | Cell Wall | A rigid layer that gives protection‚ support‚ and shape to the cell. | | Chloroplast | Organelles that carry
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