Globular and Fibrous Proteins

Question 1

what are globular proteins made of?

Answer 1

amino acids joined by peptide bonds

Question 2

what are fibrous proteins made of?

Answer 2

amino acids joined by peptide bonds

Question 3

what types of bonds hold globular proteins in their 3D shape?

Answer 3

hydrogen bonds
ionic bonds
disulfide bridges
Hydrophobic reactions

Question 4

what types of bonds hold fibrous proteins together in their 3D shape?

Answer 4

hydrogen bonds
ionic bonds
disulfide bridges
Hydrophobic reactions

Question 5

what is the shape of a globular protein?

Answer 5

compact and spherical

Question 6

what is the shape of a fibrous protein?

Answer 6

long strands, little to no tertiary structure

Question 7

is a globular protein soluble, why?

Answer 7

Yes, because hydrophilic R groups are found on the outside of the protein and these can form hydrogen bonds with water.

Question 8

is a fibrous protein soluble, why?

Answer 8

no, because hydrophobic R groups are found on the outside of the protein and these cannot form hydrogen bonds with water.

Question 9

can globular proteins be transported easily?

Answer 9

yes, they are soluble

Question 10

can fibrous proteins be transported easily?

Answer 10

no, they are insoluble

Question 11

are globular proteins structurally strong?

Answer 11

no

Question 12

are fibrous proteins structurally strong?

Answer 12

yes, the polypeptide chains often coil tightly around each other and there are sometimes disulfide bridges.

Question 13

what is the role of a globular protein?

Answer 13

• transport proteins

- important in metabolism reactions

Question 14

what is the role of a fibrous protein?

Answer 14

structural molecules in skin and hair

Question 15

examples of globular proteins

Answer 15

• haemoglobin

- antibodies

Question 16

examples of fibrous proteins

Answer 16

keratin and collagen