lec 5: Protein chemistry

Question 1

amino acid that has no benzene ring

Answer 1

aliphatic amino acid

Question 2

amino acid that has benzene ring

Answer 2

aromatic amino acid

Question 3

amino acid that has 2 or more non benzene rings

Answer 3

heterocyclic amino acid

Question 4

essential amino acids

Answer 4

methionine & phenylalanine

Question 5

semi essential amino acids

Answer 5

arginine

Question 6

non essential amino acids

Answer 6

glycine & serine

Question 7

ability of amino acids to behave as acids or alkalis according to the ph of the medium

Answer 7

amphoteric property

Question 8

proton donor in amino acids

Answer 8

COOH group

Question 9

proton acceptor in amino acids

Answer 9

NH2 group

Question 10

amino acid at IEP (zwitterion)

Answer 10

R(CHNH3+COO-)

Question 11

the only optically inactive amino acid

Answer 11

glycine

Question 12

the ability of a substance to rotate the plane of polarization of a beam of light that is passed through it

Answer 12

optical activity

Question 13

carbon atom that attaches to 4 different groups

Answer 13

asymmetric carbon atom

Question 14

polymers of amino acids

Answer 14

peptides

Question 15

bonds stabilizing secondary proteins

Answer 15

peptide, hydrogen and vander waal bonds

Question 16

proteins held together only by peptide bonds

Answer 16

primary proteins

Question 17

covalent force that helps stabilize tertiary proteins

Answer 17

disulfide bond

Question 18

non-covalent forces that help stabilize tertiary proteins

Answer 18

hydrophobic - hydrogen - ionic & vander waal bonds

Question 19

proteins that describe fibers

Answer 19

secondary proteins

Question 20

proteins that consist of more than one polypeptide chain

Answer 20

quaternary proteins

Question 21

a protein that has 4 polypeptide chains

Answer 21

haemoglobin

Question 22

physical denaturation causes

Answer 22

heat - uv rays - ultrasonic waves - x rays - strong shaking - high pressure

Question 23

chemical denaturation causes

Answer 23

alkalis - acids - detergents - heavy metals - organic solvents

Question 24

physical effects of denaturation

Answer 24

-increasing viscosity -decreasing solubility

Question 25

biological effects of denaturation

Answer 25

-loss of biological activity (function)
-increasing digestibility

Question 26

simple proteins in blood

Answer 26

albumin, globulins

Question 27

simple proteins in acne

Answer 27

gliadins, glutelins

Question 28

simple proteins in skin, hair and nails

Answer 28

seleroprotein

Question 29

nucleoproteins

Answer 29

proteins conjugated with nucleic acids

Question 30

chromoproteins

Answer 30

proteins conjugated with chromotropic groups

Question 31

proteins conjugated with iron

Answer 31

ferritin, transferrin

Question 32

proteins conjugated with copper

Answer 32

ceruloplasmin

Question 33

proteins conjugated with zinc

Answer 33

insulin

Question 34

proteins conjugated with magnesium

Answer 34

kinases

Question 35

proteins conjugated with manganese

Answer 35

carboxylases

Question 36

non-metallochromoprotein in skin

Answer 36

melanin

Question 37

decomposition products of proteins by denaturation

Answer 37

primary derived proteins

Question 38

decomposition products of proteins by hydrolysis

Answer 38

secondary derived proteins