1.

(a) 21 21 16 16 (%) 0.03 4.00 0.03 4.00 () 17 34 17 34

P Q R S (i)

3 1

(ii)

(iii)

2 (iv) (1) (2) (v) 1 1 1

2001-CE BIO 2-1

1.

(b) 2 cm3 A B B

A B (%) 0.3 1.5

0 15 0 5

(i) (1) B 3

(2) B 1 (ii) B 2 4

(iii) A

2001-CE BIO 2-2

1.

(c)

(i)

1 1

(ii)

(iii) 2 (iv)

(1) (2) (3) 2001-CE BIO 2-3

1 2 4

2.

(a)

(i)

1

5 3

(ii) 2

(iii) 2 3

2001-CE BIO 2-4

2.

(b)

(i)

(1) 2

(2) 3 (ii) (1) (2) 2. (c) 2 3

(i)

3 4

(ii)

(iii) 4 2001-CE BIO 2-5

3.

(a)

(i)

A (1) (2) A 1 1

(ii) B (1) 2 (2) B 1 (3) B 2 (iii) 3

2001-CE BIO 2-6

3.

(b) pH

pH 3 5 7 9 11 (i) T (s) >100 50 20 20 27 2 2

(ii) (1) T

(2) (1) pH 3 (iii) (1) pH (2) pH 1 1

(iv) 4 2 2001-CE BIO 2-7

3.

(c)

(i)

C B 2

(ii) 2 (iii) C (1) (2) 1

2001-CE BIO 2-8

4.

(a)

(i)

1 3 2

(ii) (i) (iii) (iv)

(1) 3 (2) 2

2001-CE BIO 2-9

4.

(b)

(i)

A. B 3 1

(ii) (1) X

(2) X 4 (iii) Y 2

2001-CE BIO 2-10

4.

(c)

20

(i)

5 7

2

(ii) 5 (iii) 2

2001-CE BIO 2-11