Biology SL P3 A ans-2 - INTERNATIONAL BACCALAURAT...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
MARKSCHEME November 2001 BIOLOGY Standard Level Paper 3 12 pages N01/410/S(3)M A BACCALAUREATE BACCALAUR&AT INTERNATIONAL BACHILLERATO INTERNACIONAL
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Option A & Diet and Human Nutrition A1. (a) Award [1] for any two of the following fat / saturated / unsaturated; cyanocobalamin / vitamin ; 12 B pantothenic acid; energy; carbohydrate; riboflavin / 2 B; pyridoxin / 6 tocopherol; cholesterol; [1 max] (b) both are low in carbohydrates / pantothenic acid / tocopherol / unsaturated fats; both are high in protein / retinol / thiamin / niacin / folic acid; diet A is high in ascorbic acid / fibre, diet B is low; diet B is high in energy / fat / cholesterol / riboflavin / niacin / cyanocobalamin, diet A is low; [3 max] [2 max] (c) Award [1] for each diet from the following. diet A: weight loss due to lack of energy; diet A: pernicious anaemia (or any of the symptoms of it); diet A: high levels of folic acid may mask the initial symptoms of pernicious anaemia; diet B: lack of fibre may lead to problems in the large intestine or even to colon cancer; diet B: lack of ascorbic acid may lead to scurvy (or any of the symptoms of it); diet B: excess of fat / cholesterol may lead to heart disease (or similar) ; diet B: excess of fat may lead to overweight or obesity; diet A/B: lack of pantothenic acid may cause fatigue / numbness / tingling of hands and feet; note : dietary deficiencies have not been described for insufficient intake of tocopherols due to lack of documented evidence in humans. A2. (a) Award [1] for any two of the following . cell membranes; energy reserve; can be remodelled to make steroids / hormones; insulation; protection; myelin sheath; [1 max] (b) ( unit required for mark ) [1] 100 16 66 - 67 g 24 ×= & 3 & N01/410/S(3)M A
Background image of page 2
(c) diets high in lipids may lead to (high blood cholesterol levels which may lead to) coronary heart disease (other circulatory problems); a causal link has not been established between high blood cholesterol levels and coronary heart disease; bodies can synthesise cholesterol from unsaturated fats (which do not have a strong correlation with coronary heart disease); diets high in lipids (are often high in energy which) may lead to obesity; [3 max] (d) one function for each needed for [1] retinol: maintainance of mucous membranes of eye and respiratory tract; formation of rhodopsin / pigments of the retina; bone / teeth growth; embryonic growth and development; tocopherol: antioxidant / prevents damage to phospholipids in cell membranes / prevents sterility; [1 max] A3. avoids contamination with potential pathogens / bacteria ( e.g. botulism / salmonella) / viruses ( e.g . hepatitis A) / parasites ( e.g . roundworm eggs); prevents disease; avoids food spoilage / keeps longer; helps to maintain nutritional quality; [3 max] & 4 & N01/410/S(3)M A
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Option B & Physiology of Exercise B1. (a) ( unit required for mark ) [1] -1 446 mmol s 6.03 s 74 mmol = (accept 6.0 or 6 s) [2 max] (b) rate of ATP use is higher when lactate is produced / rate of ATP use is slower when is produced; 2 CO when produced a longer pathway is used / lactate pathway is shorter / 2 CO fermentation pathway is shorter; lactate pathway has less ATP available than pathway; 2 CO (c)
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/01/2009 for the course BIO 19839791 taught by Professor Ms.nerd during the Spring '09 term at International University of Sarajevo.

Page1 / 11

Biology SL P3 A ans-2 - INTERNATIONAL BACCALAURAT...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online