monomers and polymers

Question 1

what are monomers

Answer 1

subunits which make up polymers

Question 2

what forms a polymer?

Answer 2

monomers join via condensation reaction and release water forming a bond

Question 3

what forms a polymer to a monomer?

Answer 3

hydrolysis reaction uses water to break up chemical bond in a polymer into a monomer

Question 4

if 3 monomers join together via a condensation reaction how many water molecules are made?

Answer 4

2 molecules of water

Question 5

what is a non reducing sugar

Answer 5

usually disaccharide need to heat with HCL and neutralise heat with bendicts and there should be a red precipitate

Question 6

where is the glycosidic bond between 2 alpha glucose molecules

Answer 6

the OH groups on each molecule

Question 7

Use of a colorimeter in this investigation would improve the repeatability of
the student’s results.

Answer 7

quantitive, standardises the method

Question 8

Describe two differences between the structure of a cellulose molecule
and a glycogen molecule.

Answer 8

• parallel chains
  glycogen is branched
• alpha glucose
  beta glucose

Question 9

Describe and explain two features of starch that make it a good storage
molecule.

Answer 9

• insoluble- water potential does not effect
  branched- compact

Question 10

Suggest how glycogen acts as a source of energy.

Answer 10

• hydrolysed into glucose for respiration

Question 11

Explain the difference in the structure of the starch molecule and the
cellulose molecule shown in the diagram above.

Answer 11

Starch formed from α-glucose but cellulose formed from β-glucose;
2. Position of hydrogen and hydroxyl groups on carbon atom 1
inverted.

Question 12

Explain how cellulose molecules are adapted for their function in plant
cells.

Answer 12

Long and straight chains;
2. Become linked together by many hydrogen bonds to form
fibrils;
3. Provide strength (to cell wall).

Question 13

definition of genetic diversity ?

Answer 13

different alleles in a population(group of species) or if it is individual species in a population ( gene)

Question 14

When DDT binds to a sodium ion channel, the channel remains open all the time.
Use this information to suggest how DDT kills insects.

Answer 14

-if sodium ion channels remain open there is constant depolarisation so action potnetial not reached

Question 15

use calculations in your answer

Answer 15

• percentage change
• mean mode range
• how much more how much less

Question 16

how do mutated versions of a species become high frequency?

Answer 16

• 1. Mutation produced resistance allele/ advantageous allele;
     
     2. advantageous allele provides selection pressure;
     3. advantageous allele more likely (to survive) to reproduce;
     4. Leading to increase in advantageous allele in population over many generations .