Monomers

Question 1

Explain why amylase produced in the human digestive system does not
digest GOS.( polysaccharide of galactose)
___________________________________________________________

Answer 1

Amylase Active site (only) complementary to starch
OR
Active site not complementary to GOS;

2. (Due to) tertiary structure;
   2
   (d)

Question 2

(d) Prebiotics are foods used to promote good health in humans.
Prebiotics stimulate the growth of ‘healthy’ bacterial populations in the
human digestive system.
The bacteria in these ‘healthy’ populations produce enzymes that
hydrolyse GOS.
Suggest how GOS can work as a prebiotic.

Answer 2

1. Provides galactose
2. 3. (Bacteria use the galactose/sugar) for respiration;
      (Bacteria use the galactose/sugar) for binary fission;

Question 3

Describe the chemical reactions involved in the conversion of polymers to
monomers and monomers to polymers.
Give two named examples of polymers and their associated monomers to
illustrate your answe

Answer 3

condensation reaction joins monomers together and forms a
(chemical) bond and releases water;
A hydrolysis reaction breaks a (chemical) bond between
monomers and uses water;
A suitable example of polymers and the monomers from which
they are made;

• amino acid and polypeptide, protein, enzyme,
antibody or specific
example
• nucleotide and polynucleotide, DNA or RNA
• Alpha glucose and starch/glycogen
• Beta glucose and cellulose.

Question 4

Is a monomer in an enzymes active site

Answer 4

Amino acid

Question 5

Is produced during photosynthesis and respiration

Answer 5

ATP

Question 6

What reducing sugar, or sugars, would you expect to be produced during chewing? ( chewing cooked wheat which has starch )Give a reason for your answer.

Answer 6

Maltose
Salivary enzymes break down starch

Question 8

what other enzyme is required for the complete digestion of starch?

Answer 8

Maltase