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GCSE OCR Biology A Papers 1 and 3
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#1. What is an active site?
#2. What is the role of protease?
#3. Sensory neurones have a fatty layer of insulation, what is it called?
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#4. Growth is increased during puberty. Why is this?
#5. True or false – A passive process is automatic and does not require energy?
#6. What is the equation for magnification?
There are two equations for magnification, both tell you how many times larger the image appears than it actually is.
One equation links the magnification of the two lenses and the other equation links magnification to the size of the object and image.
#7. Specialised cells have different compositions of sub cellular structures in order to perform their role. Why would specialised cells have lots of mitochondria?
#8. Resting metabolic rate is measured under which of the following conditions?
Select all that apply:
#9. What are the upper chambers of the heart called?
#10. What is the name of the chemicals that we use to transmit messages through the blood to organs?
#11. Which of the following features are found in arteries?
#12. Which of the following are prokaryotes?
Select all that apply:
#13. Which sub-cellular structures can be found in plants?
Select all that apply:
#14. How are cells that line the small intestine specialised?
#15. Electron microscopes have much higher resolution and magnification than light microscopes. What are the advantages of this?
#16. What is enzyme specificity?
#17. What is stroke volume?
#18. Why is there a size limit to cells?
#19. What is the resolution of light microscopes limited by?
#20. What are two systems which allow your body to respond to its surroundings?
Select all that apply:
#21. What are substrates?
#22. The female gametes (egg cells) are adapted to their function. Which of the following are adaptations of egg cells?
Select all that apply:
#23. Name one hormone that is released from the ovaries?
#24. Name one hormone that is produced in the pancreas?
#25. What is the function of platelets?
#26. Which type of white blood cells produce antibodies that stick to the antigens of pathogens?
#27. Fill in the gap to complete the word equation for aerobic respiration. glucose + oxygen → ….. + water
#28. In what part of the cells does aerobic respiration take place?
#29. Which of the following are factors that affect the rate of diffusion?
Select all that apply:
#30. Which of the following are waste products produced by the body?
Select all that apply:
#31. Which hormone is released from the adrenal gland?
#32. The left ventricle has a thicker muscle wall, why is this the case?
#33. What is the role of DNA synthase?
#34. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?
#35. Which of the following describes metabolic rate?
#36. Where does blood entering the heart through the pulmonary veins come from?
#37. Which type of white blood cell engulfs (surrounds) foreign cells in order to digest them?
#38. Multicellular organisms are too large to allow diffusion through their cells to provide the necessary resources. Instead we have transport systems. What is the name of the transport system that uses capillaries to transport substances via the blood?
#39. What is the purpose of respiration?
#40. How many chambers does the heart have?
#41. When is adrenaline released?
#42. Through which process would air in a space station move if someone opened a door to space?
#43. What is the role of coronary arteries?
#44. Why do high breathing and heart rates remain after exercise?
Select all that apply:
#45. What travels along neurones to pass information through the nervous system?
#46. Which pathway is used when rapid automatic responses are needed by your body to external stimuli, like touching a hot object?
#47. Is osmosis an active or a passive process?
#48. What is the Induced Fit Model of enzyme action?
#49. What is the part of the heart that the arrows are pointing to?
#50. Hormones are released by a range of glands, name one gland that releases hormones. ? do not include the word "gland" or "glands"
#51. Place the measurement units in order from from biggest to smallest. micrometres, picometres, kilometres, metres, nanometres, millemetres ? Use British Spelling - Metres* NOT Meters
#52. Where does blood from the aorta travel to?
#53. Growth hormone stimulates cells in muscles and bones to divide. It also stimulates another system, which system is this?
#54. How many chromosomes does a single sperm cell have?
#55. What are the monomers of fats/lipids?
#56. The drug called Digitalis slows the heart rate. Where does the drug come from?
#57. True or false – A concentration gradient is a term used to explain how the moon moves in the night sky?
#58. Why is catalysis by enzymes important for life processes?
#59. Where are relay neurones found?
#60. Which sub-cellular structures can be found in bacteria?
Select all that apply:
#61. What is the role of the inferior vena cava?
#62. Is respiration an exothermic or an endothermic reaction?
#63. What is enzyme activity?
#64. What is the process by which organisms remove waste from their bodies?
#65. What is the heart rate measured in?
#66. What does μm stand for?
#67. What are the lower chambers of the heart called?
#68. What are cells that line structures in the body and have cilia?
#69. Which process in the body produces carbon dioxide?
#70. What is the function of white blood cells?
#71. The male gametes (sperm cells) are adapted to their function. Which of the following are adaptations of sperm cells?
Select all that apply:
#72. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out
#73. What is the definition of resolution?
#74. Anaerobic respiration does not involve oxygen. Select the correct word equation for anaerobic respiration.
#75. The respiratory system relies on diffusion of oxygen and carbon dioxide. Which of the following statements are correct?
Select all that apply:
#76. Upon the release of adrenaline do blood vessels widen, narrow or both?
The blood vessels are constricted or dilated depending on where the blood flows.
The muscles required for running for example are dilated since they are required to match the “fight or flight” response. Others are constricted as they are temporarily deemed less important.
#77. The Nervous System is made up of two parts, the Central Nervous System (CNS) and what other part?
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#78. What is the role of the cell membrane?
Select all that apply: