1.Which one of the following structures is found in animal cells, but not in plant cells? A cell surface membrane B centriole C chloroplast D Golgi body 2. The diagram below shows an enzyme and two inhibitors of the enzyme, X and Y. Which of the following describes the two inhibitors? A X and Y are competitive inhibitors. B X and Y are non-competitive inhibitors. C X is a competitive inhibitor and Y is a non-competitive inhibitor. D X is a non-competitive inhibitor and Y is a competitive inhibitor. 3. In a reaction controlled by an enzyme, which of the following graphs shows the effect of substrate concentration on the rate of the reaction? 2
4. If sucrose is actively loaded into a sieve tube, which combination of changes takes place in the sieve tube? 5. The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polysaccharide formed by ten glucose molecules? A C60H100O50 B C60H102O51 C C60H111O51 D C60H120O60 6. Which of the following pairs of cellular organelles can be found in both animal and plant cells? A Lysosomes and centrosomes B Mitochondria and ribosomes C Mitochondria and leucoplasts D Endoplasmic reticulum and chloroplasts 3
7. The diagram shows the effect of light intensity on the rate of transpiration from the upper and lower epidermis of a leaf. Other environmental factors were kept constant. What could explain the differences in transpiration rates from the two surfaces? A Higher light intensities are associated with higher temperatures. B The palisade mesophyll cells have fewer air spaces than the spongy mesophyll cells. C The upper epidermis has fewer stomata. D The upper epidermis is more exposed to light. 8. In response to dehydration, ADH is secreted by the posterior pituitary gland. One of its eff ects is to stimulate: A a reduction in the glomerular filtration rate B an increase in the number of aquaporins in the cell membranes of collecting duct cells C an increase in the uptake of water by cells in the proximal convoluted tubules of nephrons D an increase in the volume of urine produced by the kidneys 9. Which of the following is most suitable for determining whether the light-dependent reactions occur in algal plants? A Release of oxygen B Formation of starch C Absorption of CO2 D Formation of glucose 4
10. Glucose is small enough to be filtered from the blood in glomeruli in the kidney, but is not normally found in the urine. This is because glucose is: A reabsorbed in distal convoluted tubules B reabsorbed in proximal convoluted tubules C reabsorbed along the whole length of the nephrons D respired by cells in the kidney 11. What can be concluded if CO2 is released during respiration? A This process is definitely an anaerobic respiration. B This process is definitely an aerobic respiration. C This process is definitely not a lactic acid fermentation. D This process is definitely not an alcoholic fermentation. 12. Which of the following occurs in the body in response to the secretion of glucagon? A conversion of glucose to glycogen in liver cells B decrease in the blood glucose concentration C increased uptake of glucose by muscle cells D production of cyclic AMP in target cells 13. The micrograph shows an artery and a vein. Which row correctly identifies and describes the artery and the vein? 5
14. Where is the mammalian heart beat initiated? A atrioventricular node B left atrium C Purkyne tissue D sinoatrial node 15. A student made drawings of four blood cells as shown in the figure. The correct identification of the cells is : 16. When pathogenic microorganisms invade human body, they will be ingested and eliminated by the monocytes. This is an example of __________. A a specific immunity B a non-specific immunity C immunity against a certain antigen D immunity involving antibodies 6
17. Insufficiency of anti-diuretic hormone in our blood will result in the production of _______. A large volume of hypotonic urine B large volume of hypertonic urine C small volume of hypotonic urine D small volume of hypertonic urine 18. Which of the following is an incorrect statement about the homeostatic control of the concentration of glucose in the blood? A Positive feedback is involved in the control of blood glucose. B The concentration of glucose in the blood fluctuates within narrow limits. C The hypothalamus is the control centre for blood glucose. D The liver is an organ in blood glucose homeostasis. 19. The diagram shows the changes in blood pressure as blood flows through the blood vessels in the human systemic circulatory system. Which correctly identifies the vessels labelled P to S? 7
20. During prophase of mitosis, chromosomes consist of two chromatids. At which stage of the cell cycle is the second chromatid made? A cytokinesis B G1 C G2 D S 21. A cell in the process of meiosis was seen to have a spindle with sister chromatids being drawn towards opposite poles of the cell. In what stage of meiosis was the cell? A anaphase I B anaphase II C metaphase I D metaphase II 22. Rana clamitans and Rana cateiana are of ________. A the same genus but different species B different genus but the same species C the same genus and species D different genus and species 23. Plant use nitrogen for synthesis of amino acids. This nitrogen enters through the _______. A stomata as nitrates B roots as nitrates C stomata as nitrogen D roots as nitrogen 8
24. Which of the following events occurs when a human primary spermatocyte develops into a secondary spermatocyte? A The amount of DNA increases B The homologous chromosomes separate C The centromere of chromosomes divides D The number of chromosomes reduces from 2n to n. 25. All the off spring of a cross between pure-bred red-flowered and pure-bred white-flowered snapdragons were pink. Two of these pink-flowered plants were interbred. What proportion of the off spring were pink? A 25% B 33% C 50% D 100% 26. A man has haemophilia. Which statement correctly describes the inheritance of the gene causing his condition? A He inherited the recessive allele from his mother. B He inherited the dominant allele from his father. C He can pass the recessive allele to a son. D He can pass the dominant allele to a daughter. 27. After being treated with methylaldehyde solution, the toxin from diphtheria bacillus is injected into human body and antibody is produced. What is the toxin after treatment known as? A Antibiotics B Endotoxin C Antitoxin D Toxoid 9
28. Under normal condition, which of the following components of blood will not be filtered through the Bowman’s capsule? A Urea B Glucose C Protein D Mineral ions 29. If inclusion body is found in cell, that means this cell has been infected by which of the following living organisms? A Virus B Fungi C Bacterium D Protozoa 30. What substance does the bacteriophage inject into the bacteria to cause its death? A Antibiotic B DNA C Enzyme D Toxin 10