NTDT200 Lecture 9: Chapter 8
17 Aug 2018
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Document Summary
Structural material: muscle, bone, hair, skin, nails. Critical functions: enzymes, hormones, antibodies, fluid balance, ph balance and transporters. Protein needs: rda-. 8grams/kg of body weight for adults, amdr-acceptable macronutrient distribution range- 10-35% of total kcal. Proteins are the building blocks of protein are amino acids. Protein structure: amino acids linked together by peptide bonds, dipeptide have 2 amino acids, tripeptides have 3 amino acids, polypeptides-many amino acids. Transcription- dna provides instructions that are read and made into mrna. Functional protein: after translation, amino acid chain folds into particular shape, shape determines the function of the protein, denaturation-caused by heat, light, change in ph, alcohol or motion. Protein digestion and absorption: stomach, hcl, pepsin. Fate of an amino acid: proteins in the body, metabolized as a source of energy, synthesized into glucose or fat. Metabolism of amino acids: remove amino group, kidney excretes urea, remaining carbon skeleton, made into energy, glucose or fat.
