Cell wall is a fairly rigid‚ protective and supportive layer surrounding the cell external to plasma membrane of plants‚ bacteria‚ archaea‚ fungi and algae. It is absent in animals and most protists. It was first observed by Robert Hooke in 1665. It is not an entirely rigid structure as the cell wall expands due to the growth of the cell. It varies in thickness from o.1mm to I0mm.in most of the cells‚ cell wall is present from the very beginning to the last‚ but in slime molds (myxomycetes)
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® keep it simple science Copying is permitted according to the Site Licence Conditions only HSC Biology Topic 1 MAINTAINING A BALANCE What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. ENZYMES & HOMEOSTASIS 2. TEMPERATURE REGULATION 3. INTERNAL TRANSPORT SYSTEMS 4. EXCRETION & WATER BALANCE but first‚ an introduction... Living Things are Made of Cells Homeostasis All living things are composed of microscopic units
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and will attempt to maximise throughout of free energy. Similarly‚ I am glad that Raine‚ et. al. understands that “living systems will maximise energy flux but minimize the amount of specific dissipation as heat.” While evaluating the process of transpiration of plant‚ Addiscott (2009) concluded that “linear non-equilibrium‚ entropy minimizing system is the appropriate analogues for an ecosystem.” The plant will minimise water loss‚ thus maintaining low entropy. Evolution has placed the stomata on the
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Jules AS ENGLISH 10/03/2011 Blanche’s Lies: An Investigation of Paper in A Streetcar Named Desire And so it was I entered the broken world To trace the visionary company of love‚ its voice An instant in the wind (I know not whither hurled) But not for long to hold each desperate choice. (allpoetry...) In this passage from the epigraph of the play‚ we see direct parallels between the poem (Hart Crane’s “The Broken Tower”) and A Streetcar Named Desire. It could be interpreted from Blanche’s
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PHYSICAL SCIENCE - REVIEW SUMMARY FOR MID-TERM AND FINAL EXAMS Reference: Exploring Physical Science textbook‚ your notes‚ quizzes and study packs … a supplemental summary of the concepts… use text to add formulas and examples.. Note Bene : The “guiding relationship” used throughout the course: E=MC2 This relationship is the foundation of the laws of conservation of mass and the conservation of energy…. Mass (or energy) can not be created nor destroyed‚ only changed
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plants (2001)‚ plants growth is directly affected by sounds of varying frequencies. They observed that when plants are exposed to pure tones‚ it affects the growth of the plant. This was due to the transverse wave which results to the increase of transpiration on the plant. Random noise was also highlighted as factor where the growth of the plant became less. Their experiment involved the use of a chamber that controlled
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reached their saturation point‚ the excess water becomes the runoff that flows down slope; f.) The quantity of water that becomes the runoff or stream flow is the total volume of rainfall minus all the water losses due to interception‚ evaporation‚ transpiration and seepage; g.) The humus of forest soil is so porous that it can absorb and hold water double its weight; the surface of the forest floor will retain water from one to five times its dry weight; h.) More springs are found on forested areas‚ or
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"In every sense‚ a standing rain forest supplies more economic wealth than if it were cleared yet deforestation continues at an alarming rate." (Tropical Rain Forest Coalition‚ 1996). Rain Forests have played a significant role in shaping modern biology. The destruction of the rain forests will determine the fate of all species humans plants and animals. Many people do not understand the long- term consequences of losing the earth’s rain forests. They have provided all living beings with many
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Rainforests The rainforest is under threat from destruction but why is it being destroyed? An area the size of a football pitch is being destroyed every second. Structure of the Rainforest The rainforest is made up of 4 layers: Emergent Layer- The tallest trees are in this layer they can be 200 feet above the forest floor. These trees can also have trunks that are 16 feet round. Animals found here include eagles‚ bats‚ monkeys and butterflies. Canopy Layer- This layer forms a type of roof above
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Describe how hydrogen bonding occurs between water molecules‚ and relate this and other properties of water‚ to the roles of water in living organisms. Water is a very small molecule‚ consisting of two hydrogen atoms covalently bonded to an oxygen atom. However the electrons shared are not done so equally‚ oxygen is more electronegative and has a firmer hold on the electrons and pulls them slightly towards its nucleus. Due to this‚ the charge across the molecule of water is not equally distributed
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