T1 - 1.3.3 Protein structure and Function

Question 1

how many levels of structure are in a protein

Answer 1

4 - primary, secondary, tertiary and quaternary

Question 2

features of the primary structure

Answer 2

the sequence of amino acids bonded by peptide bonds which folds into a specific shape

Question 3

features of the secondary structure

Answer 3

• occurs due to very weak hydrogen bonds
• this makes an alpha helix or beta pleated sheet

Question 4

what causes a hydrogen bond

Answer 4

when H atoms come closer to larger atoms

Question 5

what is a molecules polarity

Answer 5

charges that are unevenly distributed leading to very weak electrostatic forces

Question 6

what causes a tertiary structure

Answer 6

‘R’ group interactions

Question 7

features of a tertiary structure

Answer 7

• some are polar - H bonds
• cytesine contains sulphur which creates a disulphide bridge (S-S)
• some are charged -> ionic bond
• some non-polar groups form very weak temporary interactions

Question 8

what does the tertiary structure cause

Answer 8

the polypeptide chain to fold in a specific way

Question 9

what causes quaternary structure

Answer 9

occurs when 2 or polypeptide chains attach together causing a more complex structure

Question 10

example of globular proteins

Answer 10

catalase

Question 11

example of fibrous proteins

Answer 11

collagen -> structural