Int 2 2011 B The diagram below represents a potato cell. Q1(a) & (c) (i) Name the parts of the cell labelled X and Y. X Y 2 (ii) Give the function of structure Z. 1 (c) Give one difference and one similarity in the structure of plant and animal cells. Difference 1 Similarity 1 Question Acceptable Answer Unacceptable Answer 1 (a) i X = (sap) vacuole Y = cytoplasm 2 ii stores genetic information/DNA/chromosomes controls cell activity(ies)/function(s) controls the cell (reactions) controls all cell activities stores all DNA 1 (c) D = only plants have a cell wall/chloroplast/ vacuole S = both have membranes/cytoplasm/nuclei [Must have a comparison] 1 1 Int 2 A Questions 1 and 2 refer to the plant cell diagram below. Marks Q1 & 2 Q1 Which of the plant cell components shown above is made from a structural carbohydrate? Q2 Which labelled part controls cell activities?
Question Answer Unacceptable 8 (a) (i) Oxygen – waste product from photosynthesis / needed for chemical reactions Specific organs named other than lungs or placenta (b) Cell A (Cell) has increased in volume / (Cell) is turgid / (Cell) is swollen / (Cell) vacuole has swollen / cell wall stretched 1 mark Cell has absorbed water / bloated (not negating) St Gr. two properties of simple sugar molecules which allow them to be absorbed from the digestive system into the blood. Marks
(d) Complete the following word equation for the enzyme catalase. 1 Question Acceptable Answer Not acceptable Mark 4 (a) enzyme has an active site (must be clear active site on enzyme) enzyme/active site is complementary/matching shape/specific to substrate Same enzyme/active site Enzyme fits substrate (or vice 1 1 (b) denatured/ changes shape/ reduced activity/ stops working destroyed 1 (c) pH OR concentration of enzyme/substrate [any correct eg Higher] concentration 1 (d) water and oxygen [any order] both for 1 mark 1
(c) Name another human hormone produced by genetic engineering. (d) one advantage of genetic engineering. Question Acceptable Answer Not acceptable Mark 7 (a) bacterial cell E insulin gene C plasmid D All 3= 2 1/2= 1 2 (b) plasmid replicated/reproduced/copied/ duplicated OR bacteria/cell multiplied/reproduced/divided grow mitosis 1 (c) growth hormone (any correct) GH 1 (d) increased of products/increased rate of production/produced quicker large/increased volume/mass of product (or named example)/ lower cost of production/ less/no allergy to product OR an example of issue e.g. product made without killing animals/without infection from human donors cheap/quicker process guaranteed product 1
2 Question Acceptable Answer Not acceptable Mark 5 (b) increasing increases both correct = 1 1 (c) X carbon dioxide (concentration) / Lack of carbon dioxide Y temperature / temperature too low both correct = 1 temperature too high 1 (d) carbon dioxide glucose starch 3 correct = 2 1 / 2 correct = 1 2 St Gr. 2013 Q5 (a) ii & (b) Two gardeners compared their tomato crops. Both grew 10 plants of the same variety in a greenhouse. One gardener altered the environmental conditions in his greenhouse to increase the rate of photosynthesis. His plants yielded 720 tomatoes. The other gardener only produced 480 tomatoes. (ii) Describe two changes to the environmental conditions in the greenhouse which could have increased the rate of photosynthesis. 1 2 1 (b) (ii) Name a tissue in the leaves of plants in which photosynthesis takes place. 1
Question Acceptable Answer 5 C Int 2 2012 B Q3 (a) ii, (b) The process of aerobic respiration in a muscle cell is outlined below. (a) (ii) Name product Y from 1. (b) ATP is formed during respiration and broken down for uses in cells. (i) How many molecules of ATP are formed from each glucose molecule during Stage 1 only? Both 1 and Stage 2? 1 (ii) What two molecules are produced when ATP is broken down? and 1 (iii) State one use of the energy released when ATP is broken down. 1 Question Acceptable Answer Not acceptable Negates Mark 3 (a) ii pyruvic acid/pyruvate 1 (b) i stage 1 = 2/4 stage 1 + 2 = 38/36/40 1