Post on 02-Jan-2016
Question 4
A biscuit contains 2.5g of fat, 9.5 grams of sugar and 28g of starch.
What % of the biscuit is fat?
Question 5
A cake contains 2.5g of fat, 12.5 grams of sugar and 25g of starch.
What is the simple whole number ration of fat to sugar to starch?
Question 6
a) Name two places in the body where amylase is produced. (Be specific!)
b) What is the substrate of amylase?
Question 8
a) Name three substances produced by the gastric glands in the wall of the stomach.
b) Which of these three substances activates the enzyme?
Question 10
a) In which organ is bile produced?
b) In which organ is it stored?
c) What is its function in digestion?
Question 12
Give three features of a villus which make it well suited for absorption of digested food.
Question 15
a) What happens to excess amino acids not needed for growth and repair?
b) What name is given to this process?
c) Where does this occur?
Question 19
Which part of a nephron
a) collects filtrate from the glomerulus
b) is where water and salts are reabsorbed back into the blood
Question 20
a) Name a substance which is filtered out of the blood but which is all reabsorbed again.
b) Name a substance which is too large to be filtered out.
Question 22
A sample of filtrate contains 3 grams of salt. After reabsorption of some salts, this drops to 1.8 grams.
What is the % decrease in salt?
Question 24
What effect does a shortage of water in the blood have on
a) the production of ADH?
b) the permeability of the kidney tubules?
c) the volume of urine produced?
d) the concentration of urine produced?
Question 25
a) What osmotic problem is encountered by fish living in fresh water?
b) Describe the urine produced by these fish.
Question 27
What word is used to describe saltwater because it has a lower water concentration than the fish?
Answers
1. Carbohydrates2. Amino acids3. Fatty acids and glycerol (2)4. 6.25%5. 1 : 5 : 106. a) salivary glands and pancreas b) starch (2)7. Peristalsis8. a) pepsin, acid, mucus b) acid (4)9. Glucose (not maltose) 10. a) liver b) gall bladder c) emulsifies fats (3)11. Large insoluble molecules must be broken down to small soluble ones12. Large surface area, thin lining, good blood supply/lacteal present (3)13. Reabsorb water14. Stored as glycogen15. a) broken down to carbohydrate b) deamination c) liver (3)
Answers
16. renal artery17. Ureter18. Filtration and reabsorption (2)19. a) Bowman’s capsule b) tubule (2)20. a) glucose b) protein / blood cells (2)21. water, salts, urea (3)22. 40%23. Hypothalamus24. a) increases b) increases c) decreases d) increases (4)25. a) gain water by osmosis b) high volume of dilute urine (2)26. To replace water lost by osmosis27. Hypertonic28. Freshwater – large / many saltwater – few / small (2)29. Food, drink, chemical reactions (3)30. Sweat, urine, faeces, breathing (4) TOTAL 56