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Question 1

what type of bond is between protein

Answer 1

peptide

Question 2

how many types of proteins are there

Answer 2

4

Question 3

what is a primary protein structure like

Answer 3

a long chain sequence of amino acids

Question 4

how many amino acids are there

Answer 4

20

Question 5

what is contained within an amino acid

Answer 5

amino group - NH2
carboxyl group - COOH hydrogen atom - H2
R group - a variable group ach AA has the option of 20

Question 6

how do proteins form

Answer 6

condensations

Question 7

describe a secondary protein structure

Answer 7

long polypeptide chain twisted into a 3-D shape such as a coil know as an alpha helix

Question 8

why do secondary proteins have the structure they do

Answer 8

the amine group is positively charged whilst the o of the c=o group has a negative charge and cause weak hydrogen bonds to form

Question 9

describe a tertiary protein structure

Answer 9

complex 3D structure

Question 10

what are the common bonds between tertiary proteins

Answer 10

disulphide bridges - fairly dtrong and therefore not easily broken
ionic bonds between carboxyl and amino groups that are not involved in forming peptide bonds. they are weaker than disulphide bonds and are easily broken by changes in pH
hydrogen bonds - loads of them but weakkk

Question 11

describe quaternary structures

Answer 11

large proteins often form complex molecules containing many peptide bonds linked in various ways

Question 12

what affects how a protein functions

Answer 12

;the sequence of amino acids

Question 13

what is the test for proteins

Answer 13

biuret
place sdample solution in a test tube and add an equal vol of sodium hydroxide solution at room temp

add after drops of of very dilute copper sulfate solution and mix gently

a purple solution indicates the presence of peptide bond, if no protein is detected then the solution remains blue