The CELL The CELL Robert Hooke (1635-1703) Cork cells - the first person to see and name CELLS cces2013 (1665) 2 The CELL Robert Brown (1773-1858) - Discovered and named the nucleus (1833) cces2013 3 The CELL Matthias Jakob Schleiden (1804-1881) studied plant tissues and concluded that all plants are aggregates of individual cells which are fully independent (1838) cces2013 4 The CELL Theodore Schwann (1810-1882) studied animal tissues and concluded that all
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Macromolecules (also known as supermolecules) are commonly grouped into four major categories: proteins‚ nucleic acids‚ lipids and carbohydrates. These are mainly composed of polymers‚ long molecules made up of a large number of small‚ similar molecules‚ or monomers. Proteins are polymers of amino acids. Long amino acid chains are folded into complex shapes‚ the shape of each determining the function of the protein. They are complex organic compounds‚ essential to the functioning as well as the structure
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9.1 Manufacture of Sulphuric Acid 1. State uses of sulphuric acid in daily life. - lead acid batteries in automobiles and for home use - extraction of elements from ores - manufacturing of fertilizers 2.The following shows an incomplete flow chart of the Contact process. a) b)Chemical equation A. B. C. D. 3. Briefly explain the sources of sulphuric dioxide gas in atmosphere. -Sulphur dioxide is produced mainly from the combustion of fossil fuels
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Unit 1: Introduction to Biochemistry Lesson 1-4: Key Question How many electrons does Mg2+ have? (1 mark) Mg2+ has 10 electrons. A magnesium atom has 12 electrons with 2 of the 12 being valence electrons. Therefore the atom will lose the valence electrons which are located on the outermost shell to stabilize itself (outermost shell) as atoms tend to do what it easiest. Since magnesium lost 2 electrons it becomes positive as it is giving away electrons to stabilize other atoms. Hence magnesium
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secreted from the tissues to lubricate the foods passage. Many of our foods are polymers‚ These are large complex molecules composed of long chains of monomers – small basic units. Proteins and some carbohydrate are polymers. In carbohydrates‚ the monomers are monosaccharides. They contain the elements carbon‚ hydrogen and oxygen. In proteins the monomers are called amino acids. They contain carbon‚ hydrogen‚ oxygen and nitrogen. The polymers in our food are insoluble so they cannot be directly absorbed
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realize that protein adhesives are different from other adhesives in two major ways. First‚ in chemical terms‚ most adhesives‚ whether synthetic or bio-based‚ are polymers made from one or a few monomers‚ usually with similar functionality. However‚ proteins are made from more than 20 amino acid monomers with side chains containing a variety of functional groups. Second‚ morphologically‚ adhesives generally can be well described by understanding their primary and secondary structures. However‚ soy
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Review 1: The Chemistry and Molecules of Life Please note that this is a general outline of some of the topics we will have discussed and are detailed in chapters 2-5 of your textbook. While this gives you an idea of some of the terms/phrases you are responsible for‚ not all the material we covered is included. You are responsible for everything discussed in class‚ but NOT for material in the book that was not addressed in lecture. Please do NOT assume that if you know the concepts/answers to the
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INTRODUCTION 1. INTRODUCTION The copolymerization of ethylene with 1‚ 3-butadiene to give crystalline‚ homopolymer-free‚ high molecular weight‚ substantially linear copolymer is described. Butadiene polymerizes almost exclusively in a trans-1‚ 4 structure‚ ranging in content from zero to 50 mole-%. At relatively low content of butadiene monomeric units (≤30 mole-%) X-ray crystallinity is of polyethylene type with a slight variation of the structural parameters. At higher levels of
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both types of polymerization in your answer. Nylon 66 is a step-growth polymer Step-growth polymerization‚ also known as condensation polymerization‚ eliminates one small molecule when two monomer units are joined together. Chain-growth polymerization‚ also known as addition polymerization‚ joins monomer units without loss of atoms. (Blackman et al. 2012) 2. Draw the repeat unit in polyvinyl alcohol (PVA) 3. What do you understand by the term ‘cross-link’? Draw the structure of slime
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a neutral solution. b What general name is given to solutions that have many more hydrogen ions than hydroxide ions? Solutions that have many more hydrogen ions than hydroxide ions are termed acidic. 4 Name the monomers of carbohydrates‚ proteins‚ lipids and nucleic acids. The monomers (basic building blocks) of
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