Mock Exam Paper A Higher Level Marking Scheme

Marking Scheme Mock Biology Exam L C 2011

Section A Answer any five questions

1

Any five answers.

Starch or glycogen

(4)

C / scurvy or D / rickets or other suitable

2(2)

Blue to red (precipitate)

2(2)

No or it is anabolic

(4)

N

(4)

Fatty acid / glycerol

2(2)

2

Hypothesis

(4)

A hypothesis that has withstood testing

(4)

Control

(4)

Data

(4)

Replication

(4)

3

Aerobic with oxygen or anaerobic without oxygen

(4)

Mitochondria

(6)

Glycolysis

(3)

Cytoplasm

(3)

  1. Plants - ethanol / carbon dioxide
  2. Animals - Lactic acid

2(1)

(2)

4

A Cuticle B upper epidermis C Guard cell D stoma or stomata

4(1)

Prevent water loss or prevent entry of pathogens

(3)

Water / carbon dioxide / oxygen

(6)

Thin / stomata / air spaces Any two

(4+3)

5

pair of muscles that have opposite effects or explained / biceps and triceps or other example

(6)

Axial skeleton

(2)

Red marrow Formation of blood cells or platelets

Tendon Joins muscle to bone

Cartilage . Protection (absorbs shock) or reduces friction or allows bone elongation

(2)

(2)

(2)

Osteoporosis / HRT or Arthritis / anti-inflamatories or other suitable answers

2(3)

6

Diagram must show bend

D (2)

L (2)

Guanine - Cytosine / Adenine - Thymine

2(2)

Uracil / Thymine

2(2)

RNA single stranded / shorter / occurs in both cytoplasm and nucleus

2(2)

Ribosomal RNA or rRNA

(4)

Section B Answer any two question.

7

(a)

(i) Metabolism All chemical reactions in the body

(3)

(ii) Enzyme biological (protein) catalyst

(3)

(b)

Enzyme Catalase or amylase

(3)

Substrate Hydrogen peroxide or starch

(3)

Altered pH Different buffer solutions

(3)

Temperature 30 – 40oC / optimum

2(3)

Maintained Thermostatically controlled water bath

(3)

Measured activity Height of bubbles after fixed time or time taken for starch to disappear

(3)

Optimum 37oC

(3)

8

(a)

Time to disperse / time to mature / avoid adverse conditions Any two

2(3)

(b)

(i) Diagram with four test tubes (in any order)

Tube 1 Water, air and suitable tem...

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