proteins - 1

Question 1

2 thing proteins are made of

Answer 1

amino acids
one or more polypeptides

Question 2

whats a dipeptide

Answer 2

two amino acids joined together

Question 3

whats a polypeptide

Answer 3

more than two amino acids join together

Question 4

amino acid structure

Answer 4

carboxyl group (-COOH)
anime group
R group attached to carbon atom

Question 5

all living things contain how many amino acids?

Answer 5

20

Question 6

what reaction links amino acids

Answer 6

condensation

Question 7

bonds formed between amino acids

Answer 7

peptide bonds

Question 8

what happens when dipeptides and polypeptides are broken down

Answer 8

reverse reaction - hydrolysis

Question 9

protein structure (4)

Answer 9

primary, secondary, tertiary, quaternary

Question 10

primary structure

Answer 10

sequence of amino acids in polypeptide chain

Question 11

secondary structure

Answer 11

hydrogen bonds form between amino acids in chain
automatically coils into alpha helix or fold into beta pleated sheet

Question 12

tertiary structure

Answer 12

disulfide bridges form when two amino acids of cysteine come close together
more bonds form
become more coiled or folded

TIP- think of this as a big tangled spring

Question 13

quaternary structure

Answer 13

polypeptide chains are assembled together
proteins final 3D structure

Question 14

test for protein

Answer 14

biuret test

Question 15

3 steps for biuret etst

Answer 15

1. test needs to be alkaline - add a few drops of sodium hydroxide
2. add copper sulfate solution
3. if protein is present, solution turns purple