BioChemistry

Description

Flashcards on BioChemistry, created by Roy Hove on 11/03/2016.
Roy Hove
Flashcards by Roy Hove, updated more than 1 year ago
Roy Hove
Created by Roy Hove over 8 years ago
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Resource summary

Question Answer
Alanine , Valine , Leucine and Isoleucine interact in a special way within proteins They tend to cluster together within proteins, stabilizing protein structure by means of Hydrophobic interactions
The secondary amino(imino) group of proline residues Is held in a rigid conformation the reduces the structural flexibility of polypeptide regions containing proline
Having aromatic side chains helps you do what, Name amino acids with them They are relatively non polar, thus hydrophobic which means they can all participate in hydrophobic interactions Phenylalanine, Tryptophan, Tyrosine
The importance of Tyrosine in enzymes Its Hydroxyl group can form hydrogen bonds
What role do Disulfide Groups play in polypeptide structures ? They form covalent links between parts of a polypeptide molecule or between two different polypeptides
Which amino have a significant positive charge at ph 7.0 1. Lysine : second primary group on its aliphatic chain 2. Arginine : Positively charged Guanidinium Group 3.Histidine : Aromatic Imidazole group, it may be positively charged or uncharged at pH7
Which amino acids have a R group with a net negative charge Aspartate and Glutamate, each of which has a second Carboxy Group
Name a derivative of proline and where they are found 4-hydroxyproline found in plant cell wall and collagen
What is Collagen is an important constituant of connective tissue
Name 4 examples of connective tissue 1. Cornea of the eye 2. Cartilage 3. Bones 4. Tendons
Name an uncommon Amino Acid derived from lysine and where it is found 5-Hydroxylysine found in collagen as well
Name a derivative of lysine found in myosin and say what myosin is 6-N-Methyllysine and Myosin is a contractile protein of muscle
Name a derivative of Glutamate and its use y-Carboxylglutamate found in the blood clotting protein Prothrombin and in other proteins that bind Ca+
The derivative of Four lysine residues and its function Desmosine which is found in the fibrous protein Elastin.
What is Circular Dichroism The measure of the molar absorption difference of the right handed circularly polarized light
What are Chromophores and how do they act in the chiral Envronment v
What did Anfisens experiment show v
What conformation are favored by proteins conformations that require less energie
How can proteins fold so fast v
Two classes of molecular chaperons Hsp70 and Chaperonins
What are Heat Shot Proteins and what do they do With the help of ATP they help proteins to fold correctly
What catalyzes interchange or shuffling of s-s bonds Protein disulfide isomerase
What catalyzes the interconversion of the cic and trans isomers of proline Peptide prolyl cis-trans isomerase
What is the characteristic of proteins containing proline v
What are Amyloidoses and what are they caused by insoluble Amyloid Fibrils caused by the misfolding of proteins
Name Amyloid diseases Diseases the trigger neurodegeneration Pancreatic diseases
Name some of these diseases v
What is Parkinsons disease v
What is Huntington's disease Hereditary disease and is caused by the repetition of ..
What is Prion ? Proteinaceous Infectious Only Protein
Name some Prions Disease v
What is Proteostasis Maintenace of cellular protein activity whic is accomplished by
What are the two major classes of proteins Fibrous and Globular
What is Keratin and is it found v
Name two anticoagulants Lithium Heparinate and EDTA
What is the major difference between Plasma and Serum Absence of Fibrinogen in serum
Name plasma proteins Albumin , Transferrin, Ceruloplasmin and Immunoglobines
What are the two types of Immune systemes Cellular immune system and Humoral Immune system
How does the Cellular immune system work v
How does the Humoral Immune system work v
What are Antigens and Antibodies and how do they relate v
What is a epiotope and how does it relate to the immune system v
How can Proteins High specifity be explained It can be explained by ...
What are they complementary in ...
How can we make Glycoproteins and proteoglycans By covalently linking carbohydrates with proteins
What are carbohydrates They are polyhydroxy Aldehydes and ketons
What are the three classes of carbohydrates 1. Monosaccharides - single chains 2. oligosaccharides - short chains of single sugars covalently linked 3.Polysaccharides - Long chains of single sugar covalently linked eg. starch
What are Epimeres They are two sugar molecules that differ only in the configuration around one carbon atom
What is the actual function of a buffer system such as acetate/acetic acid To maintain the solution at a constant pH if the concentration of an acid or alkali increases
What two weak interactions are most important in the formation of a cluster of lipid molecules in an aqueous solution Hydrogen and hydrophobic
How many of the 20 common amino acids have rings in their structures and which ones are they 1.Tyrosine 2.Tryptophan 3.Phenyalanine 4.Histidine 5.Proline
What results from a condensation reaction between two amino acides, such as Glycine and Alanine The formation of one molecule of water
What is the average weight of an amino acide 110 Da
Which amino acid would most likely be found in the interior of a globular protein v
Which functional group is used to form Disulfide bonds Sulfhydril
Which type of weak interaction is more important for cohesiveness and strength between beta-strands in beta-sheets Hydrogen bond
What is the highest level of protein structure in human insulin, The highest level of protein structure in Human insulin which has two polypeptides of different mass linked by several disulfide bonds,
Which amino acid would most likely be found in the interior of a globular protein Alanine
Protein folding to a native conformation is highly dependent upon what 1. The relative size of amino acid R groups 2. The rotation about the alpha-carbon and carbon bond in the backbone 3.The polar character of sequences of amino acids 4.The rotation about the alpha-carbon and nitrogen bond
What are the four main steps of sequencing a protein 1. Breaking DiSulfide bonds 2. Cleaving the polypeptide chain 3.Sequencing of the peptides 4. Ordering the peptide fragments
There are two main ways of breaking disulfide bonds name them and the resultant residues 1. Oxidation with perfomic acid which resultes in cysteic acid residues 2. Reduction by Dithiothretiol DTT followed by carbomethylation by iodoacetate which results in Carbomethylated cysteine residues
Name the four Reagents for fragmenting polypeptide chains and where do they fragment Trypisine (Bovine pancrease)--> Lysine and Arginine(C term) Chymotrypsine (Bovine pancreas)--> Tryptphan, Tyrosine(C) and Phenylalanine Pepsine --> Tyrosine(N), Tryptophan, Leucine and Phenylalanine (CNBr)Cyanogen Bromide --> Methionine (C)
Name two sequencing methods 1. Edman Degradation (The succesive framentation thing) 2. Mass spectronometry
What is the difference between the Edman degradation method and the Sanger's method The sangers method uses FNDB Edmans method uses Phenylisothiocyanate
Describe the Edmans degradation for peptide sequencing Switch from low ph to high ph favors the reagent to join to one AA
Name the four favorable interactions within a protein 1. Hydrogen bonding 2. Electrostatic interactions 3.London dispersion(Van der Waals) 4.Hydrophobic effect
Why is rotation around the C-N bond restricted for planar peptide groups in polypeptide chain Because of the double bond nature of the peptide bond, thanks to the resonance in the peptide bond
Why are nearly all peptide groups in proteins in trans conformation Minimizes steric interference between adjacent side chains
What are dihedral angles Dihedral angles PHI and PSI define peptide conformations
Name four functions filled by Carbohydrates 1. Energy source and storage 2. Structural component of cell walls and exoskeletons 3. cell to cell signaling
Is it true that L and D glucose have different solubility levels False these enatiomeres have the same solubilty
Most Hexoses in living organisms are L steriomeres False
What are Diastereoisomeres Stereoisomeres that are not mirror images
Name the three D aldoses seen in class and say if they have the same level of solubility And threose and erythrose dont have the same solubility
Draw the two glucose epimers seen in class
What compound is found in self tanner lotion and how is it made
Draw Ribose, glucose, galactose, Mannose and Fructose
Between Aldehydes, Ketone carbons and Alcohol oxygens which are nucleophilic and which are electrophilic Nucleophilic : Alcohol oxygen Electrophilic : Aldehyde and Ketone carbons
What are Hemiacetals and Hemiketals and how are they formed Hemiacetals are formed when Aldehyde carbons are attacked by alcohols Hemiketals are formed when Ketone Carbons are attacked by alcohols
what are six membered oxygen containing rings called and draw three
What are five membered oxygen containing rings called They are called furanoses
What can carbohydrates be covalently bonded with ? 1. Glycoproteins 2.Proteoglycans
Give an example of a dissacharide that is 1. A Ketone 2. A polyhydroxyl aldehyde 1. Fructose 2. glucose
How can bonds between carbohydrates be 1. Broken 2. synthesized 1. Hydrolysis 2.Condensation
Name three 3 common disaccharides 1. Trehalose 2.Sucrose 3.Lactose
Name important Haxose Derivatives 6 in the course
Glycosidic bonds in carbohydrates are between The anomeric carbon and hydroxyl carbon
In gycosidic linkages which elements are reducing or non reducing 1. The anomeric carbon is non reducing 2. The second hemiacetal monomere is reducing
Where in nature can trehalose be found in nature and what disease in humans could it be used to treat Found in blood sugar of insects and might be used to treat amyloid diseases
Name two oligosaccharides that are components of antibiotics
Natural carbohydrates can be found as polymers, these polysaccharides can be of different types. Which ones 1. Homopolysaccharides 2.Heteropolysaccharides 3.Linear 4. Branched
Name three heteropolysaccharides 1. Agarose 2. Peptidogylcans 3.Hyaluronan(glycosaminoglycan)
What type of polysaccharide is glycogen Heteropolysaccharide multitype branched
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