GCSE OCR Biology A Papers 1 and 3

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OCR Biology A Papers 1 and 3

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OCR Biology A Papers 1 and 3

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#1. Specialised cells have different compositions of sub cellular structures in order to perform their role. Why would specialised cells have lots of mitochondria?

#2. Urea is produced when amino acids are broken down. Which organ processes urea?

GCSE heart diagram missing aorta

#3. What is the part of the heart that the arrows are pointing to?

#4. The pacemaker cells tell the heart when to beat, where are they located?

#5. What is the role of protease?

#6. Fill in the gap: Receptors detect pain and send impulses via the sensory neurone towards the spinal cord. The ………………… intercepts the signal and diverts it along motor neurones to the effectors (muscles) which quickly move away from the source of pain.

#7. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

#8. What is the field of view of a microscope?

#9. What is meant by an active process?

#10. Hormones are released by a range of glands, name one gland that releases hormones. ? do not include the word "gland" or "glands"

#11. Which sub-cellular structures can be found in bacteria?

Select all that apply:

#12. What is the name of the protein which moves particles across cell membranes during active transport?

#13. The female gametes (egg cells) are adapted to their function. Which of the following are adaptations of egg cells?

Select all that apply:

#14. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

#15. Which system is responsible for ensuring the supply of oxygen and glucose to cells?

#16. Which of the following sub-cellular structures provides structure and support for the cell?

Select all that apply:

#17. What effects does adrenaline have on the heart?

Select all that apply:

#18. What is the function of red blood cells (Erythrocytes)?

#19. In which part of the cell does anaerobic respiration take place?

#20. What is the role of DNA synthase?

#21. Which type of white blood cells produce antibodies that stick to the antigens of pathogens?

#22. What effect does adrenaline have on the liver?

#23. Through which process would air freshener sprayed in one corner of a room disperse?

#24. Why is the Surface area : Volume ratio so important when it comes to exchange of substances?

#25. What is the difference between aerobic and anaerobic respiration?

#26. When is adrenaline released?

The Heart GCSE

#27. Where does blood entering the heart through the pulmonary veins come from?

#28. What is the Induced Fit Model of enzyme action?

#29. What is the heart rate measured in?

#30. 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.

#31. How do substances typically move into and out of the body, for example, oxygen in the lungs? ? 1 word answer

#32. Which pathway is used when rapid automatic responses are needed by your body to external stimuli, like touching a hot object?

#33. What are the monomers of fats/lipids?

#34. What are cilia?

#35. Which of the following features are found in veins?

#36. Motor neurones carry impulses to which part of the nervous system?

#37. What is the role of lipase?

#38. Which of the following describes metabolic rate?

#39. The male gametes (sperm cells) are adapted to their function. Which of the following are adaptations of sperm cells?

Select all that apply:

#40. Why is there a size limit to cells?

#41. Which of the following is the equation for total magnification?

#42. Is active transport an active or a passive process?

#43. Surfaces where diffusion takes place allowing substances to enter the body usually have which characteristics?

Select all that apply:

#44. Where are relay neurones found?

#45. The respiratory system relies on diffusion of oxygen and carbon dioxide. Which of the following statements are correct?

Select all that apply:

#46. In what part of the cells does aerobic respiration take place?

#47. Which of the following features are found in arteries?

The Heart GCSE

#48. Where does blood from the pulmonary artery travel to?

#49. What is the function of the cell wall?

#50. What is the function of plasma?

#51. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

#52. Which of these are examples of blood vessels?

Select all that apply:

#53. Which of these is an effector?

#54. What is the role of the central nervous system (CNS)?

#55. What are the monomers of carbohydrates?

#56. What is the role of amylase?

#57. Why does the rate of an enzyme controlled reaction go down as temperature increases past the optimum level?

#58. Why do high breathing and heart rates remain after exercise?

Select all that apply:

#59. Which structures in the lungs increase the surface area and therefore the speed and amount of gas exchanged?

#60. Capillaries are only one cell thick and have thousands of branches. What is the function of capillaries?

#61. What is the role of the superior vena cava?

#62. True or false – A concentration gradient is a term used to explain how the moon moves in the night sky?

#63. What are the monomers of proteins?

#64. What is the process by which organisms remove waste from their bodies?

#65. What is the role of the inferior vena cava?

#66. Through which process do nutrients enter root hair cells from the soil?

#67. Anaerobic respiration does not involve oxygen. Select the correct word equation for anaerobic respiration.

#68. What is an advantage of anaerobic respiration?

#69. What are cells that line structures in the body and have cilia?

#70. Is osmosis an active or a passive process?

The Heart GCSE

#71. Where does blood from the aorta travel to?

#72. What is the role of glycogen synthase?

#73. Place the measurement units in order from from biggest to smallest. micrometres, picometres, kilometres, metres, nanometres, millemetres ? Use British Spelling - Metres* NOT Meters

#74. What is the Lock and Key Model of enzyme action?

#75. What is the role of the acrosome on a sperm cell?

#76. Which of the following are waste products produced by the body?

Select all that apply:

#77. What is the role of coronary arteries?

#78. Name one hormone that is produced in the pancreas?

#79. What is enzyme activity?

#80. What does μm stand for?

#81. True or false – A concentration gradient is the difference in concentration from high to low?

#82. The Nervous System is made up of two parts, the Central Nervous System (CNS) and what other part?

3

#83. What are two systems which allow your body to respond to its surroundings?

Select all that apply:

#84. Which of the following descriptions best matches the hormonal system?

#85. What is the role of the cell membrane?

Select all that apply:

#86. Sensory neurones have a fatty layer of insulation, what is it called?

1

#87. How are cells that line the small intestine specialised?

#88. Why is catalysis by enzymes important for life processes?

#89. Which part of the heart separates the two sides?

#90. Glucose enters the body via the?

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