Proteins

Question 1

whats the amino group

Answer 1

(-NH’2)

Question 2

whats the carboxyl group

Answer 2

(-COOH)

Question 3

whats the r group

Answer 3

variable group

Question 4

what elements are always present in an amino acid

Answer 4

carbon, hydrogen, nitrogen and oxygen

Question 5

what bond is created by 2 amino acids when they chemically bond together (+what reaction)

Answer 5

peptide bond (condensation reaction)

Question 6

what is the molecule called when 2 amino acids bond

Answer 6

dipeptide

Question 7

where are proteins synthesised in cells

Answer 7

ribosomes

Question 8

whats it called when 3 or more amino acids bond together

Answer 8

polypeptide

Question 9

how do you reverse the reaction and break the peptide bond and how is this carried out

Answer 9

add water (hydrolysis), by protease enzymes in the digestion system

Question 10

whats the primary structure

Answer 10

specific order of amino acids in a polypeptide

Question 11

What the secondary struture

Answer 11

specific regions of the chains fold (beta pleated sheets and alpha helix)

Question 12

what bond holds the secondary structure

Answer 12

hydrogen bonds between different parts of the polypeptide chain

Question 13

why is the tertiary structure important

Answer 13

makes the protein distinctive and gives its function

Question 14

whats the quaternary structure

Answer 14

complex molecule containing a large number of polypeptide chains

Question 15

test for proteins

Answer 15

Biuret test
1.Equal volume sodium hydroxide and sample
2. add some dilute copper sulfate solution
3.if turns from blue to purple proteins are present

Question 16

How do dipeptides and polypeptides form

Answer 16

condensation reaction between amino acids forms peptide bonds