生化15天30题正式版（Biochemical 15 days, 30 questions, official edition）.docVIP

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生化15天30题正式版（Biochemical 15 days, 30 questions, official edition）.doc

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生化15天30题正式版（Biochemical 15 days, 30 questions, official edition）

生化15天30题正式版（Biochemical 15 days, 30 questions, official edition） 1, biological different levels of structure? A: small molecules -- small molecules, precursors -- macromolecules -- macromolecular complexes -- supramolecular structures -- organelles -- cells -- tissues -- organs -- organisms 2, the structure of the alpha helix is a regular helical conformation formed by the coiling of the backbone atoms of the polypeptide chain along a central axis. Alpha helix is the most common and two largest structural component in proteins. Its structure is characterized by: (1) almost right-handed spiral; (2) each coil contains 3.6 amino acid residues, each amino acid rotates 100 degrees along the axis, and the pitch is 0.54nm; (3) the helix maintains hydrogen bonds in chains. 3, the properties of denatured proteins change Crystallization and loss of biological activity are the main characteristics of protein denaturation. The side chains of sulfur water are exposed. Physical and chemical properties change, solubility decrease, precipitation, viscosity increase, molecule extend. Changes in physiological and chemical properties. The molecular structure is loose and easily hydrolyzed by protease. 4, raw eggs and cooked eggs which is more nutritious? Answer: (1) more than cooked egg egg nutrition; (2) cooked egg has occurred the protein denaturation, easy protease hydrolysis, easy digestion and absorption; (3) microbial pathogens in egg death due to protein thermal denaturation and edible safety; (4) the raw egg white avidin will binding biotin to form a stable compound, the absorption of biotin was not the intestinal wall. Protein one or two and three or four structures; beta fold, alpha helix Two nucleic acid structure and function The structural features of 1 and B double helix DNA? (1) two reverse polynucleotide chains parallel around a central axis right hand formed double helix structure, spiral surface has a major and minor grooves; (2) phosphoric acid and ribose in the lat