protein structure

Question 1

how many levels of protein structure are they and what are the names?

Answer 1

4
primary
secondary
tertiary
quarternary

Question 2

what is the primary structure of proteins?

Answer 2

the sequence of amino acids in a polypeptide chain

Question 3

what is the secondary structure of proteins?

Answer 3

amino acids contain polar groups which attract to eachother forming hydrogen bonds- this makes the amino acid fold and twist into a new shape

alpha helix
beta pleated sheets

Question 4

how is alpha helix and beta pleated sheets maintained?

Answer 4

by hydrogen bonding

Question 5

what is the tertiary structure of proteins?

Answer 5

*further folding of the protein structure to form a unique 3D shape

R groups interact to form several bonds : ionic bonds, disulfide bridge, hydrogen bonds,hydrophobic interactions

Question 6

what are ionic bonds formed from in tertiary structure?

Answer 6

from charged R groups and hydrogen bonding

Question 7

what is a disulfide bridge?

Answer 7

2 sulfur atoms bonded

Question 8

what are hydrophobic interactions?

Answer 8

when R groups are polar

Question 9

what is the quarternary structure of proteins?

Answer 9

*2 or more polypeptide chains combined to form a proteins

Question 10

what are examples of proteins with quarternary structure?

Answer 10

collagen and haemoglobin

Question 11

what does the haem group contain in haemoglobin?

Answer 11

Iron