filaments within these structures are cross-linked by accessory proteins known as actin binding proteins. These proteins connect two actin filaments through its two actin-binding sites or dimerization with actin domains. Crosslinking actin filaments can be performed by fimbrin proteins that attach filaments in a parallel fashion to facilitate movement. Thus‚ they are localized in microvilli‚ filopodia‚ and focal adhesions. Other proteins including α actinin and spectrin connect actin filaments in an
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has the instructions for making proteins Part of the nucleus | function | Chromatin | * The chromatin consists of DNA and proteins. * Some of these proteins controls the activities of the cell * When cells divide‚ chromatin condenses into visible chromosomes * The chromatin shows up as dark patches when it is stained. | Nucleolus | * The nucleolus makes RNA and ribosomes-these pass into the cytoplasm and proteins are assembled on them (protein synthesis) * The nucleus is a dense
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assisted by an enzyme called primase (Weaver‚ 2005). Primase is a short strand of RNA that provides a starting point for DNA synthesis. DNA polymerase III also can only synthesize a new DNA strand in 5’ to 3’ direction. Helicase Is a molecular motor protein that opens up or unzips a strand of DNA‚ creating the replication fork. This now allows the replication process to take place. DNA polymerase I Its function during replication is to remove any RNA primer left in the lagging strand and replace the
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– The Proteins and Amino Acids Chapter Learning Objectives 6.1 State why some amino acids are essential‚ nonessential‚ or conditionally essential to the human body‚ and outline how the body builds a protein molecule. 6.2 Describe the digestion of protein and the absorption and transport of amino acids in the body. 6.3 List the roles that various proteins and amino acids can play in the body‚ and describe the influence of carbohydrate on amino acid metabolism. 6.4 Compute the daily protein need
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primary structure‚ secondary structure‚ tertiary structure and quaternary structure of proteins‚ and describe the types of bonding (hydrogen‚ ionic‚ disulfide and hydrophobic interactions) which hold the molecule in shape. (g) Analyse the molecular structure of a dimeric enzyme with a quaternary structure e.g. viral/HIV protease‚ as an example of a globular protein‚ and of collagen as an example of a fibrous protein‚ and relate these structures to their functions. (h) Explain the mode of action of enzymes
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One – 1. Proteins - Proteins are chains of amino acids. In general‚ proteins may be structural proteins used to build tissues‚ they may be enzymes that mediate chemical reactions‚ or they may be hormones. Examples of proteins would be channel proteins in cell membranes‚ collagen protein in the skin‚ actin and myosin in the muscles‚ and hemoglobin in red blood cells. Types of dietary sources would be‚ meat‚ milk‚ (both of which are not pure proteins‚ but are good sources of protein)‚ eggs‚ grains
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hydrogen bond between every fourth peptide bond. They are usually found in fibrous protein such as keratin and collagen. Beta pleated sheets are structures where two regions of the polypeptide chain lie parallel to each other. Again hydrogen bonds between the parts of the backbone in the parallel regions hold the structure together. The cores of many globular proteins are made of beta pleated sheets. The 3-D shape of a protein is otherwise known as the tertiary structure. Superimposed on the patterns of
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would give a positive result: a. Benedict’s test - glucose tap water oil (lipid)) starch protein b. Starch test - glucose tap water oil (lipid)) starch protein c. Sudan IV test - glucose tap water oil (lipid)) starch protein d. Biuret test - glucose tap water oil (lipid)) starch protein 7. All proteins contain carbon‚ hydrogen‚ oxygen and what other element? Nitrogen 8. When one glycerol molecule covalently
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membrane bound organelles‚ or tiny cellular structures that carry out specific functions necessary for normal cellular operation. smaller than plant cells. Cell Membrane is the outermost component of a cell. it is composed of 55% proteins‚ 25% phospholipids‚ 13% cholesterol‚ 3% carbohydrates‚ and 4% other lipids. encloses the cytoplasm and forms the boundary between material inside and materials outside it. it is semi-permeable‚ which means it regulated the flow of materials such
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types of macromolecules: carbohydrates‚ proteins‚ lipids and nucleic acids. In this lab we will test four foods to see if they contain carbohydrates (sugar and/or starches)‚ proteins and lipids. We will use chemical reagents to test to determine the presence of macromolecules: Benidicts solution for sugar‚ Iodine for starch‚ Biurets reagent for protein‚ and Sudan III for lipids. Hypothesis (1 point) If we test buttermilk biscuits for starches‚ sugars‚ proteins and lipids then it will test positive
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