EXPT 3: PROTEINS

Question 1

charring of powdered egg albumin indicates __________

Answer 1

presence of carbon

Question 2

formation of water vapor at the sides of the test tube indicates ________________

Answer 2

presence of hydrogen and oxygen gas

Question 3

red litmus paper turning blue indicates ____________-

Answer 3

presence of nitrogen in the form of ammonia gas

Question 4

filter paper with lead acetate turning black indicates ______________

Answer 4

presence of sulfur

Question 5

result of biuret test

Answer 5

rose pink/purple color

Question 6

result of ninhydrin reaction test

Answer 6

violet to blue color

Question 7

result of xanthoproteic reaction test

Answer 7

yellow to orange color

Question 8

results to violet ring at the junction

Answer 8

Hopkins-Cole Test

Question 9

flesh to red precipitate

Answer 9

Millon’s Test

Question 10

indication of biuret test

Answer 10

presence of peptide linkage in polypeptides except in dipeptides

Question 11

indication of ninhydrin reaction

Answer 11

presence of a-amino group

Question 12

indication of millon’s test

Answer 12

phenol group in tyrosine

Question 13

indication of hopkins-cole test

Answer 13

indole ring in tryptophan

Question 14

indication of xanthoproteic reaction

Answer 14

nitration of benzene in phenylalanine, tyrosine, and, tryptophan

Question 15

amino acid present in biuret test

Answer 15

glycine
alanine
valine

Question 16

amino acid present in ninhydrin reaction

Answer 16

a-amino group

Question 17

amino acid present in xanthoproteic reaction

Answer 17

phenylalanine, tyrosine, and tryptophan

Question 18

amino acid present in hopkins - cole

Answer 18

indole ring in tryptophan

Question 19

amino acid present in millons test

Answer 19

phenol group in tyrosine

Question 20

structural protein naturally found
in certain cereal grains

Answer 20

gluten

Question 21

results of egg albumin + acetic acid + heat

Answer 21

production of white coagulum or white precipitate

Question 22

proteins that are responsible for motion and locomotion of cells and organisms

Answer 22

contractile proteins

Question 23

proteins are essential nutrient for ________

Answer 23

heterotrophs

Question 24

The extracellular matrix is largely made of what?

Answer 24

proteins

Question 25

the name of the largest protein to date

Answer 25

titin

Question 26

how many amino acids does a typical protein have?

Answer 26

200 - 300 amino acids

Question 27

what do you call the smallest proteins?

Answer 27

peptides

Question 28

where is the largest protein found?

Answer 28

skeletal and cardiac muscle

Question 29

the number of amino acids of the largest protein to date

Answer 29

27, 000 amino acids in a single chain

Question 30

proteins are constructed from unbranched chains of amino acids called ____________

Answer 30

polymers

Question 31

the building block of proteins

Answer 31

amino acids

Question 32

what is the other term for building blocks?

Answer 32

monomers

Question 33

what dictates the shape and other properties of a protein?

Answer 33

precise sequence of amino acids

Question 34

Why can cysteine partially meet the need for methionine?

Answer 34

they both contain sulfur

Question 35

Which of the amino acids can partially substitute for phenylalanine?

Answer 35

tyrosine

Question 36

the four levels of protein structure

Answer 36

primary
secondary
tertiary
quarternary

Question 37

what level of protein structure is composed of single covalent bonds?

Answer 37

primary structure

Question 38

give the two types of secondary structure

Answer 38

alpha helix
beta-pleated sheets

Question 39

refers to the combination of a pure helix or pure beta or combination of both

Answer 39

tertiary structure

Question 40

waste disposal of ninhydrin reaction test

Answer 40

organic non-halogenated