Paper 1 silly mistakes

Explain one way in which starch molecules are adapted for their function in plant cells (2)

1. Insoluble;

2. Don’t affect water potential;

   OR

3. Helical;

4. Compact;

   OR

5. Large molecule;

6. Cannot leave cell;

Explain how cellulose molecules are adapted for their function in plant cells (3)

1. long and straight chains

2. become linked together by many hydrogen bonds to form myofibrils

3. provide strength to cell wall

Contrast the processes of facilitated diffusion and active transport (3)

1. fac.diff. involves channel proteins and carrier proteins vs a.t. only involves carrier proteins

2. fac.diff. is passive vs a.t. uses ATP

3. fac.diff. happens down a concentration gradient vs a.t. occurs against a concentration gradient

.

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Give the two types of molecule from which a ribosome is formed (1)

• RNA

• protein/amino acid

Define species richness (1)

The number of species in a community

accept habitat/ecosystem/environment

anything other than population!!!!

Draw structure of amino acid (1)