Proteins - Proteins General Info from the Greek proteios...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Proteins General Info from the Greek “proteios” (meaning first pace) the largest and most diverse of macrmolecules necessary in the diets of most animals - why not all? B. What do they do? 1. Enzymes - are proteins that make reaction go faster 2. Hormones - chemical messengers - turns reactions on or off Most hormones are proteins? TRUE but not ALL 3. Transporters - they help move molecules - a) through membranes Active transport pumps different molecules and ions across the membrane from the side with fewer solutes to the side with more solutes - takes energy Passive transport doesn’t take any energy 4. Structural - mechanical support; Part of: - hair - cartilage - bone - feathers 5. Contractile - allows muscles to contract 6. Protective - antibodies are proteins which fight diseases (immuno-globulins) 7. Storage - stored food in seed embryos and eggs 8. Toxins - some kill bacteria 9. Communication - cel signaling (receptors on cell surface) C. Where do we get proteins? 1. Meat ~ 43% protein 2. Milk has ~ 27% protein 3. Eggs has ~ 50% protein 4. Plants - (mostly in seeds) - about 1% - 15% Outer part of seed is called bran D. Protein malnutrition is especially a problem in child development - ( protein shortage is a major food problem - NOT calories - and especially for brain development - damage is irreversible after about 5 years II. Protein structure? Shape of protein is what determines what it can do - made up of 20 amino acids - eight are “essential amino acids” i.e. the body cannot produce these - the remaining 12? - Complete protein - all of the essential amino acids - all eight, ex. milk, meat, eggs - incomplete protein - ex. grass seeds because low in lysine and broad leaf seeds low in mythionine (2 of the 8 essential amino acids) A. what is an amino acid? - building blocks of proteins, made up of four parts (textbook) 1. Amine group NH3+ 2. carboxyl group COO- 3. Carbon atom with H+
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4. An R group made up of CH2 and other things. ....(online) - decides what the amino acids do because it gives them their shape - could be short or long but is specific for each amino acid - may contain N and S atoms - four levels on study guide - Denatured when the peptide bond occurs because you can’t un-do it, once you’ve
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/17/2011 for the course ISB 202 taught by Professor Johnson during the Fall '08 term at Michigan State University.

Page1 / 5

Proteins - Proteins General Info from the Greek proteios...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online