what are proteins | Proteins flashcards


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what are polymers? they are large that are made up of repeating units
what are monomers? they are simple compounds that can join together to form polymers
what is a condensation reaction? it is a reaction links two molecules together with the removal of a water molecule
what are the structural units of proteins? Amino Acids
what elements make up proteins? carbon, hydrogen, oxygen and nitrogen
what are the functions of proteins? structural support, Muscular contraction, Cell movement, metabolic regulation through enzymes, defense through antibodies, clotting protein factors
Proteins account for what percentage of the body weight? 20%
what are globular proteins? they are proteins with a fairly rounded shape. Most enzymes are globular
what are fibrous proteins? they are extended and strand like water insoluble proteins that have a structural role
where are Globular proteins found? found in blood, and muscle
Fibrous proteins form? they form extended sheets or strands
Are fibrous proteins soluble or insoluble in water? fibrous proteins are insoluble in water
what are the functions of fibrous proteins? fibrous proteins play a structural role in the body
what are the bond found between amino acids in proteins? peptide
how are proteins classified? they are classified according to their shape and solubility
what are proteins made up of? Proteins are made by polymerization of amino acids through peptide bonds
what is a peptide bond? Alpha carboxyl group of one amino acids reacts with alpha group of another amino acid to form a peptide bond or CO-NH bridge
How many peptide bonds are present in a tripeptide? A tripeptide is a combination of three amino acids, therefore a tripeptide contains two peptide bonds
what is a polypeptide? A polypeptide is a combination of 10 to 50 amino acids
what is the difference between a polypeptide and a protein? A combination of 10 to 50 amino acids is called a polypeptide. By convention, chains containing more than 50 amino acids are called proteins
what are the levels of organizations of proteins? Proteins have primary, secondary, tertiary and quatenary level of organization
what are the salient features of a peptide bond? The peptide bond is a partical double bond. The C-N bond is 'trans' in nature and there is no freedom of rotation because of the partical double bond character
what is the N-terminal of a protein? At one end of a protein there will be a free alpha amino group. The end is called the amino terminal end and the amino acid contributing the amino group is named as the first amino acid
what are the named of the amino acids of proteins? An amino terminal (N-terminal) is where the end is a free alpha amino group. The carbonyl terminal end (C-terminal) is where there is a free alpha carbonly group
what is an example of a pseudopeptide? Glutathione (gamma-glutamyl-cysteinyl-glycine).
what is meant by a domain of a protein? It is the term used to denote a compact unit of protein.
what are some agents that cause denaturation of proteins? Heat, urea, X-ray, U.V radiation, high pressure, vigorous shaking
what are primary proteins? They are linear polypeptide chain that are composed of amino acid residues linked through peptide bonds.
what types of bonds are in primary proteins? peptide bonds
what are peptides? they are linear polymers of amino acids
what are some characteristics of peptide bonds? they are stable, rigid and planar, and they have resonance interaction
what are secondary proteins? secondary proteins are as a result of the interaction of nearly located radicals of amino acids.
which bonds stabilize secondary proteins? disulfide bonds between the cysteine radicals
what are fibrous proteins? they are extended and strand like water insoluble proteins that have a structural role
Fibrous proteins are have what kind of structure? secondary structure
what are the two types of secondary structures? alpha helices and beta sheets
How are secondary structures formed? they form as an interaction of hydrogen bonding between NH and the CO groups on the main chain
what are the two ways that the beta strands can align? through parallel and antiparallel
what is a mixed beta sheet? it is a beta sheet with parallel and antiparallel elements
what are loop regions? they are structures that link secondary structures
what are tertiary proteins? This is the next level of protein folding. It is a packing of polypeptides in 3-D
why do proteins fold? to form the most stable structures
what are Quaternary proteins? This are the structures formed when two or more polypeptide chains come together to form proteins.
give an example of Quaternary proteins? Hemoglobin, Fibrinogen

what are polymers?

what are monomers?

what is a condensation reaction?

what are the structural units of proteins?

what elements make up proteins?

what are the functions of proteins?

Proteins account for what percentage of the body weight?

what are globular proteins?

what are fibrous proteins?

where are Globular proteins found?

Fibrous proteins form?

Are fibrous proteins soluble or insoluble in water?

what are the functions of fibrous proteins?

what are the bond found between amino acids in proteins?

how are proteins classified?

what are proteins made up of?

what is a peptide bond?

How many peptide bonds are present in a tripeptide?

what is a polypeptide?

what is the difference between a polypeptide and a protein?

what are the levels of organizations of proteins?

what are the salient features of a peptide bond?

what is the N-terminal of a protein?

what are the named of the amino acids of proteins?

what is an example of a pseudopeptide?

what is meant by a domain of a protein?

what are some agents that cause denaturation of proteins?

what are primary proteins?

what types of bonds are in primary proteins?

what are peptides?

what are some characteristics of peptide bonds?

what are secondary proteins?

which bonds stabilize secondary proteins?

what are fibrous proteins?

Fibrous proteins are have what kind of structure?

what are the two types of secondary structures?

How are secondary structures formed?

what are the two ways that the beta strands can align?

what is a mixed beta sheet?

what are loop regions?

what are tertiary proteins?

why do proteins fold?

what are Quaternary proteins?

give an example of Quaternary proteins?

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