EXPT 3: PROTEINS Flashcards
charring of powdered egg albumin indicates __________
presence of carbon
formation of water vapor at the sides of the test tube indicates ________________
presence of hydrogen and oxygen gas
red litmus paper turning blue indicates ____________-
presence of nitrogen in the form of ammonia gas
filter paper with lead acetate turning black indicates ______________
presence of sulfur
result of biuret test
rose pink/purple color
result of ninhydrin reaction test
violet to blue color
result of xanthoproteic reaction test
yellow to orange color
results to violet ring at the junction
Hopkins-Cole Test
flesh to red precipitate
Millon’s Test
indication of biuret test
presence of peptide linkage in polypeptides except in dipeptides
indication of ninhydrin reaction
presence of a-amino group
indication of millon’s test
phenol group in tyrosine
indication of hopkins-cole test
indole ring in tryptophan
indication of xanthoproteic reaction
nitration of benzene in phenylalanine, tyrosine, and, tryptophan
amino acid present in biuret test
glycine
alanine
valine
amino acid present in ninhydrin reaction
a-amino group
amino acid present in xanthoproteic reaction
phenylalanine, tyrosine, and tryptophan
amino acid present in hopkins - cole
indole ring in tryptophan
amino acid present in millons test
phenol group in tyrosine
structural protein naturally found
in certain cereal grains
gluten
results of egg albumin + acetic acid + heat
production of white coagulum or white precipitate
proteins that are responsible for motion and locomotion of cells and organisms
contractile proteins
proteins are essential nutrient for ________
heterotrophs
The extracellular matrix is largely made of what?
proteins
the name of the largest protein to date
titin
how many amino acids does a typical protein have?
200 - 300 amino acids
what do you call the smallest proteins?
peptides
where is the largest protein found?
skeletal and cardiac muscle
the number of amino acids of the largest protein to date
27, 000 amino acids in a single chain
proteins are constructed from unbranched chains of amino acids called ____________
polymers
the building block of proteins
amino acids
what is the other term for building blocks?
monomers
what dictates the shape and other properties of a protein?
precise sequence of amino acids
Why can cysteine partially meet the need for methionine?
they both contain sulfur
Which of the amino acids can partially substitute for phenylalanine?
tyrosine
the four levels of protein structure
primary
secondary
tertiary
quarternary
what level of protein structure is composed of single covalent bonds?
primary structure
give the two types of secondary structure
alpha helix
beta-pleated sheets
refers to the combination of a pure helix or pure beta or combination of both
tertiary structure
waste disposal of ninhydrin reaction test
organic non-halogenated
