fibrous and globular proteins

Question 1

what is the function of fibrous proteins?

Answer 1

structural function

Question 2

how does the quarternary structure of fibrous proteins link to its structural function?

Answer 2

hydrogen bonds bind polypeptides together e.g collagen and silk

the high number of hydrogen bonds between polpeptide chains in collagen stops chains from sliding past eachother making collagen strong

Question 2

how does the secondary structure of fibrous proteins link to its function?

Answer 2

alpha helix: the several strands of alpha helixes can be coiled together to give a rope like arrangement

this provides the fibrous proteins with strength so it can carry out its structural function

beta pleated sheets: form layers of protein to make it stronger e.g fibroin in silk

Question 3

what are examples of fibrous proteins?

Answer 3

collagen in skin and blood vessels
alpha keratin in wool
fibroin in silk

Question 4

what is the function of globular proteins?

Answer 4

metabolic function in organisms

Question 5

how does the tertiary structure link to the function of globular proteins?

Answer 5

additional folding of the protein gives globular proteins a 3D shape that is compact this makes the protein SOLUBLE IN WATER

soluble in water as charged groups on the outside and hydrophobic groups on the inside

solubility in water enables the protein to perform metabolic functions:

• enzymes: active site binds to substrate
  antibodies : site for binding antigens
  hormones: sites for binding to specific receptors

Question 6

why are globular proteins soluble in water?

Answer 6

soluble in water as charged groups on the outside and hydrophobic groups on the inside

Question 7

why is solubility in water of globular proteins important?

Answer 7

solubility in water enables the protein to perform metabolic functions:

• enzymes: active site binds to substrate
  antibodies : site for binding antigens
  hormones: sites for binding to specific receptors

Question 8

how does the quartnernary structure of globular proteins link to its metabolic function?

Answer 8

in globular proteins: disulfide bridges bond the polypeptide chains together e.g insulin, haemoglobin, immunoglobulins

the disulfide bridge bonds help the proteins resist denaturation so it can carry on metabolic function

Question 9

what are examples of globular proteins?

Answer 9

insulin haemoglobin and immunoglobulins

Question 10

fibrous protein structure linked to function: all info

Answer 10

secondary structure:
-alpha helix: the several strands of alpha helixes can be coiled together to give a rope like arrangement
-this provides the fibrous proteins with strength so it can carry out its structural function
-beta pleated sheets: form layers of protein to make it stronger e.g fibroin in silk

quarternary structure:
-hydrogen bonds bind polypeptides together e.g collagen and silk

-the high number of hydrogen bonds between polpeptide chains in collagen stops chains from sliding past eachother making collagen strong

Question 11

structure of globular proteins linked to its metabolic function : all info

Answer 11

TERTIARY STRUCTURE
additional folding of the protein gives globular proteins a 3D shape that is compact this makes the protein SOLUBLE IN WATER

-soluble in water as charged groups on the outside and hydrophobic groups on the inside
-solubility in water enables the protein to perform metabolic functions:
- enzymes: active site binds to substrate
antibodies : site for binding antigens
hormones: sites for binding to specific receptors

QUARTERNARY STRUCTURE
in globular proteins: disulfide bridges bond the polypeptide chains together e.g insulin, haemoglobin, immunoglobulins

the disulfide bridge bonds help the proteins resist denaturation so it can carry on metabolic function