Biological Molceules- Proteins

Question 1

Using the information provided about rubredoxin ( a polypeptide chain containing iron ions and sulphur) state two similarities between the if rubredoxin and haemoglobin

Answer 1

-contains polypeptide chains
-contains sulfur
-have a prosthetic group
-contains iron

Question 2

Using the information provided about rubredoxin ( a polypeptide chain containing iron ions and sulphur) state two similarities between the if rubredoxin and haemoglobin

Answer 2

-haemoglobin is a larger molecule/ has more amino acids
-haemoglobin is made of more than one polypeptide chain
-haemoglobin contains haem

Question 3

State three properties of fibrous proteins that make it different from globular proteins

Answer 3

-insoluble
-strong
-unreactive

Question 4

Coeliac disease is caused by an immune reaction reaction to gliadins in a persons digestive system . The immune system produces antibodies to bind to gliadin polypeptides which causes inflammation. Some people who stop eating foods that contain gluten still occasionally experience symptoms of coeliac disease.
What can you conclude about:
-The structure of the antibody that causes coeliac disease
-what the antibody bind to when producing the symptoms of coeliac disease

Answer 4

-other foods may have similar antigens
-antigen is a short sequence of amino acids
-binds to a cell’s receptor so it releases histamine

Question 5

Explain why a process known as transcription is necessary for polypeptide synthesis

Answer 5

-dna is transcribed as dna as it s too large to fit through the nuclear pores then goes to ribosomes

Question 6

Compare the properties and functions of fibrous proteins and globular proteins

Answer 6

Fibrous proteins:link being insoluble , elongated , strong and flexible to :
-collagen in ligaments
-keratin for protection
-elastin elastic properties
Globular proteins:link being soluble,spherical,having a pr-athletic group, temperature sensitive to
-amylas being an enzyme
-insulin regular in glucose concentration in blood
-haemoglobin-transporting o2

Question 7

Describe and explain why collagen is a fibrous proteins

Answer 7

-long chain of amino acids
-insoluble
-little to no tertiary structure
-provides strength
-has 2 different amino acids

Answer 8

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