proteins

Question 1

what is the amino group

Answer 1

h - n - h

Question 1

what is carboxyl group

Answer 1

o = c - oh

Question 2

How is protein different from carbohydrates and lipids

Answer 2

also have nitrogen atoms

Question 3

defenition of protein

Answer 3

polymers made of amino acids monomers

Question 4

what is a chain of amino acids called

Answer 4

polypeptide

Question 5

what does the shape of proteins depend on?

Answer 5

specific sequence of amino acids in the chain

shape determins its function

Question 6

how many ‘sections’ are in the protein diagram

Answer 6

4

Question 7

what are the ‘sections’ are in a protein diagram

Answer 7

amino group - n h2
carboxyl group - cooh
hydrogen atom
r group

Question 8

what is the r group

Answer 8

variable group of atoms

Question 9

simplest amino acid is

Answer 9

glycine

Question 10

what is a R group of a amino acid

Answer 10

variable group of atoms

Question 11

what is a R group of a fatty acid

Answer 11

long hydrocarbon chain

Question 12

what are essential amino acids

Answer 12

cannot be syntheised by our bodies - must be provided by diet

Question 13

what are non essential amino acids

Answer 13

can be synthesised by our own bodies

Question 14

how are 2 amino acids joined

Answer 14

amino group of one reacts with the carboxyl group by condensation reaction

Question 15

how are 2 amino acids joined (in terms of bonding)

Answer 15

water is elimated and peptide bond is formed

Question 16

peptide bond definition

Answer 16

chemical bond formed as amino group reacts with the carboxyl group of another by condensation reaction

Question 17

example of a quaternary protein

Answer 17

haemoglobin

Question 18

example of tertiary protein

Answer 18

enzyme

Question 19

what is the primary structure

Answer 19

sequence of amino acids in a polypeptide chain

Question 20

what is the sequence of amino acids determined by

Answer 20

one gene codes for one polypeptide

Question 21

in primary protein what is the bond

Answer 21

peptide

Question 22

what are secondary protein structures

Answer 22

shape that the polypeptide chain forms due to hydrogen bonding

Question 23

what affect does hydrogen bonding have on secondary protein structures

Answer 23

twist and folds polypeptide forming alpha helix or beta pleated sheet

Question 24

what extra bonds are present in secondary

Answer 24

hydrogen

Question 25

how are tertiary protein structure created

Answer 25

alpha helix is further folded and twisted to give a more complec compact 3D structure

Question 26

what extra bonds are present in tertiary

Answer 26

disulphide, ionic, covalent ,hydrophobic

Question 27

how are quaternary protein structure formed

Answer 27

combination of 2 or more polypeptide chains in tertiary form

Question 28

what are quaternary protein

Answer 28

assosciated with non - protein groups and form large compex molecules such as haemoglobin

Question 29

how many chains does haemoglobin have

Answer 29

4 polypeptide

Question 30

what are the 2 different classifications of proteins

Answer 30

globular fibrous

Question 31

globular proteins functions

Answer 31

enzymes, antibodies and hormones

Question 32

how are globular proteins structure

Answer 32

compact and folded into a 3d spherical molecule

Question 33

are globular proteins soluble in water

Answer 33

yes

Question 34

what do fibrous proteins do

Answer 34

perform structural functions

Question 35

structure of fibrous proteins

Answer 35

consists of polypeptides in parallel chains or sheets to form long fibres

Question 36

properties of fibrous proteins

Answer 36

insoluble in water, strong and tough

Question 37

how many polpeptide chains does collagen have

Answer 37

3

Question 38

example of fibrous protein

Answer 38

collagen

Question 39

example of globular protein

Answer 39

haemoglobin

Question 40

are polypeptide chains in haemoglobin same or different

Answer 40

different

Question 41

are polypeptide chains in collagen same or different

Answer 41

same

Question 42

are haemoglobin assosciated with non protein groups

Answer 42

yes - iron

Question 43

highest level of protein structure for haemoglobin

Answer 43

quaternary

Question 44

highest level of protein structure for collagen

Answer 44

tertiary

Question 45

science of biuret test

Answer 45

in presence of peptides - copper 2 ion forms violet complex in an alkaline solution

Question 46

fatty acid test description

Answer 46

add 1ml of absolute ethanol - forms white emulsion