1. Cells A cell is the basic‚ living‚ structural‚ and functional unit of the body. Cytology: the study of cells A generalized view of the cell 3 main parts of the cell: Plasma membrane‚ cytoplasm and nucleus. * Plasma (cell) membrane: * Outer‚ limiting membrane separating the cell `s internal components from the extracellular materials and external environment. * Cytoplasm (formed or molded): * Consist of all the cellular contents between the plasma membrane and the
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here’s a short preview of this essay with formatting removed for you to read Have a little read: ... The cell membrane structure-Fluid mosaic model The cell membrane separates a watery cytoplasm from a watery external environment also known as ECF. The phospholipids are arranged in a double layer (lipid layer) with the hydrophilic heads facing outward (cytoplasm or ECF) and the hydrophilic tails turned in towards each other. The unsaturated fatty acids are not bonded to each other and form a fluid
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You may also see proteins in the cell membrane that act as channels to help the movement along. Of course there is an in-between transport process where very small molecules are able to cross a semi-permeable membrane. Proteins are used to help move molecules more quickly. Since the cell membrane will not allow glucose to cross by diffusion‚ helpers are needed. The cell might notice outside fluids rushing by with free glucose molecules. The membrane proteins then grab one molecule and
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CELL STRUCTURE CELL THEORY: Structural and functional unit of all living things New cells arise from already existing cells Cells contain information that instructs growth. This information can be passed onto new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare
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CELLS All living things are made of cells‚ and cells are the smallest units that can be alive. Life on Earth is classified into five kingdoms‚ and they each have their own characteristic kind of cell. However the biggest division is between the cells of the prokaryote kingdom (the bacteria) and those of the other four kingdoms (animals‚ plants‚ fungi and protoctista)‚ which are all eukaryotic cells. Prokaryotic cells are smaller and simpler than eukaryotic cells‚ and do not have a nucleus. Prokaryote
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high concentration to an area of low concentration. For a diffusion system to be efficient‚ it should have a large surface area so that high amount of substances can be exchanged at a time. It should also have a thin membrane and a continuous supply of substances‚ as a thin membrane means that the diffusion pathway would be short‚ and the continuous supply helps maintain a concentration gradient‚ which is essential for diffusion to take place. There are two main types of diffusion; simple and facilitated
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the structure highlighted in light yellow | | plasma membrane | | | endoplasmic reticulum | | | Golgi apparatus | | | vesicle | | | vacuole | Question 2 The molecule listed below is an example of a(n) _____. | | phospholipid | | | cholesterol | | | steroid | | | fat | | | oil | Question 3 Identify Structure D | | glycoprotein | | | cholesterol | | | phospholipid bilayer of membrane | | | extracellular matrix | | | protein | Question
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processes and membrane functions are going to be affected by the loss of oxygen‚ blood glucose‚ and waste removal? Without the heart pumping‚ oxygen and blood glucose won’t reach the vital organs of the body that need them for sustenance. Eventually without the ability to produce ATP the body’s cells will die. C. Which intracellular organelles have membranes as part of their structure? How would the breakdown of the membranes of these structures affect the function of Joseph’s heart cells? All
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| | Answers are attached Enjoy Biology‚ 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir
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1. In the plasma membrane‚ the phospholipid heads A) are hydrophobic and face outward towards the aqueous solution on both sides of the membrane B) are hydrophilic and face inward‚ shielded from water C) are hydrophilic and face outward towards the aqueous solution on both sides of the membrane D) are hydrophobic and face inward‚ shielded from water Points Earned: 0.5/0.5 Correct Answer(s): C 2. The function of chloroplasts is A) lipid synthesis. B) intracellular digestion
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