Gene Expression. Totipotent Cells are undifferentiated cells‚ such as embryonic stem cells‚ that are not yet defined in their function. In animals‚ stem cells are totipotent. Plants have far more types of totipotent cells (Think of how you can make cuttings of plants‚ and grow an entirely new plant‚ given the right conditions?) Cells loose totipotency‚ as‚ with age‚ different genes are swtiched on/off. When certain genes are switched of‚ they are not translated to produce polypeptides‚ meaning
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A mitochondrion (Terminologia histologica: Mitochondrion) is a cell organelle of eucaryotes with ovoid shape that is the major source for intracellular energy. Mitochondria are present in all but mature red blood cells. They can migrate through the cytoplasm and change their shape. These organelles have an outer unit membrane (membrana mitochondrialis externa) and an inner membrane (membrana mitochondrialis interna). The latter has protrusions into the matrix (mitochondrial plasma). Depending on
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The Biological Importance of Water! The ultimate importance of water is none other than the fact that life cannot exist without it. Water being the major component of our body cells‚ typically making 70-95% of it‚ constructs the body mass with approximately 80% being water. Humans are not the only ones who contain the valued material but other creatures like the jellyfish hold 96% of water as their body mass. The structure of the water molecules enables it to have extreme properties that are
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plant’s life cycle and are essential for plant body development. functions -Stimulates cell elongation -Stimulates cell division in the cambium and‚ in combination with cytokinins in tissue culture -Stimulates differentiation of phloem and xylem -Stimulates root initiation on stem cuttings and lateral root development in tissue culture -Mediates the tropistic response of bending in response to gravity and light -The auxin supply from the apical bud suppresses growth of lateral buds
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* Support of stems and adapt themselves to the rapid elongation of leaves. B.3. Sclerenchyma * Provides elasticity‚ flexibility‚ and rigidity to the plant body forming support. PERMANENT TISSUE C. Vascular Tissue C.1. Xylem Primarily functions for the transport of water and dissolved substances upward in the plant body. C.2. Phloem Primary functions in the transport of organic materials such as carbohydrates and amino acids. ANIMAL TISSUES Animal Tissues Developed
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progressively to the mid rib. * Yellowing and dying of leaves starts on the older leaves; the dead leaves hang down at the side of the pseudostem. * the plant dies when infection is so severe. * the pseodostem is cut in cross-section‚ blakening of the xylem tissues can be
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Mitochondria and nucleus c) Cell wall and cell membrane d) Cell cycle and mitosis e) Cell cycle and cancer f) Tissue and organ system g) Digestive system‚ circulatory system‚ and respiratory system h) Root system and shoot system i) Phloem and xylem vessel 2. On a separate piece of paper‚ draw a labeled diagram of an animal cell. Identify at least 6 organelles in your diagram. 3. Identify which stage of mitosis each of the following cells is going through. Describe what is happening to the
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Parasitic Nutrition 21 May 2011 10:43 = organisms that live on or in another organism obtaining nourishment at the expense of the host and causing harm. Gut parasite (Taenia solium) = tapeworm Primary host = human (eat uncooked infected pork) Secondary host = pig (drainage channels contaminated by human faeces) Adaptations… - Suckers & hookers (attachment) - Body covering (immune responses) - Thick cuticle (inhibitory substances = enzymes) - Simple body systems (reproduction) - Very thin & large
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gravity. Water can be pulled upward through tiny tubes because of the remarkable cohesion of water so that they form a continuous stream extending from leaves to root. The integrity of the column is also maintained by the adhesion of water to the xylem walls (Pidwirny‚ 2006). These are important facts because when water is sticking together it means more water is pulled up the stem to replace the water loss. Evaporation is the process of water changing from a liquid into a gas (Pidwirny‚ 2006)
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The Biological Importance of Lipids Lipids are organic compounds found in all types of plant and animal cells. They always contain carbon‚ hydrogen and oxygen‚ however the relative amount of oxygen is less than the amount of carbohydrates in lipids. Lipids are polymers and the long chains of repeating units are joined together in a condensation reaction where water is also produced. The most common types of lipids are triglycerides‚ phospholipids and waxes. Triglycerides are formed by three fatty
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