Biochemistry 2280A Chapter Notes - Chapter 3: Hydrophile, Keratin, Hemoglobin

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emeraldhorse370

24 Apr 2018

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The shape and structure of proteins: the shape of a protein is determined by its amino acid sequence, a protein is made from a chain of amino acids held together by peptide bonds. Helices, sheets, random coils, and any other loops and folds that form between the n- and. Proteins can be classified into families: protein families, in which each family member has an amino acid sequence and a three- dimensional conformation that closely resemble those of the other family members. Hemoglobin, the protein that carries oxygen in red blood cells, is a partic- ularly well-studied example. The protein contains two identical -globin subunits and two identical -globin subunits, symmetrically arranged. A collagen molecule consists of three long polypeptide chains, each containing the non-polar amino acid glycine at every third position. Apparently, proteins do not require this type of structural reinforcement in the relatively mild conditions in the cytosol.

Related Questions

a. in the alpha helix, the amino acid side chains project outfrom the coiled backbone of the polypeptide chain

b. the peptide bond is one kind of amide linkage

c. other than peptide bonds, hydrogen bonding is the mostimportant interaction in pleated sheet and alpha helicalstructures

d. the native state of a protein is the least stable from undercellular conditions

e. Globular proteins often contain a pocket or groove into whicha prosthetic group of substrate can fit

please be very specific

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1. Polypeptide strands is the active form of a digestive enzyme in the stomach that breaks polypeptide chains into smaller polypeptides.

2. Cleavage of proteins by pepsin in the stomach results in formation of pepsinogen which get broken down further in the small intestine.

3. An amino acid chain made up of three amino acids joined together is called a tripeptide.

4. Dipeptide describes an amino acid chain made up of two amino acids joined together.

5. The 20 different amino acids are the building blocks used for protein synthesis.

6. Amino acid pools are stockpiles found in the blood and other cells of the body that can be used to build new proteins.

7. The continual process of degrading and synthesizing protein is called protein turnover.

8. The stomach produces pepsin, which denatures protein.

9. Denaturation occurs when a protein is exposed to heat, acid, bases, or mechanical agitation resulting in unfolding of the protein, though the peptide bonds remain intact.

10. The part of an amino acid that contains nitrogen is called the amine group.

11. The acid group is also known as the carboxyl group.

12. Single amino acids that are absorbed in the small intestine travel to the liver via the portal vein.

Please correct these sentences AS SOON AS POSSIBLE.. Some of them are not correct and I didn't figure out what are they!

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Biochemistry 2280A Chapter Notes - Chapter 3: Hydrophile, Keratin, Hemoglobin

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