Mock test. 1 hour and 10 minutes. 60 marks available.
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GCSE OCR Combined Science A Papers 1 and 7
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#1. Electron microscopes have much higher resolution and magnification than light microscopes. What are the advantages of this?
#2. Which of the following are the 4 factors that affect the rate of photosynthesis?
Select all that apply:
#3. What is the role of coronary arteries?
#4. The Nervous System is made up of two parts, the Central Nervous System (CNS) and what other part?
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#5. What is the role of the inferior vena cava?
#6. Place the measurement units in order from from biggest to smallest. micrometres, picometres, kilometres, metres, nanometres, millemetres ? Use British Spelling - Metres* NOT Meters
#7. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?
Select all that apply:
#8. Which of these are examples of blood vessels?
Select all that apply:
#9. What is an advantage of anaerobic respiration?
#10. 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.
#11. In active transport – are particles travelling with or against the concentration gradient?
#12. Through which process do nutrients enter root hair cells from the soil?
#13. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?
#14. What is enzyme specificity?
#15. What is the role of ribosomes?
#16. What is the role of the cell membrane?
Select all that apply:
#17. What is an active site?
#18. Which parts of the heart and blood vessels stop blood from flowing in the wrong direction?
#19. What is the role of the nucleus?
#20. 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?
#21. Name one hormone that is produced in the pancreas?
#22. What are the lower chambers of the heart called?
#23. What are cells that line structures in the body and have cilia?
#24. What is the heart rate measured in?
#25. What are two systems which allow your body to respond to its surroundings?
Select all that apply:
#26. Urea is produced when amino acids are broken down. Which organ processes urea?
#27. Is diffusion an active or a passive process?
#28. Growth hormone stimulates cells in muscles and bones to divide. It also stimulates another system, which system is this?
#29. Through which process do chemicals move across synapses?
#30. Oxygen enters the body via the?
#31. What are the monomers of carbohydrates?
#32. Which of the following are prokaryotes?
Select all that apply:
#33. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out
#34. How do substances typically move into and out of the body, for example, oxygen in the lungs? ? 1 word answer
#35. What is the role of glycogen synthase?
#36. What is the function of plasma?
#37. Why is the rate of an enzyme controlled reaction lower at lower temperatures?
#38. Sensory neurones have a fatty layer of insulation, what is it called?
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#39. Why is catalysis by enzymes important for life processes?
#40. What is the role of starch synthase?
#41. 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.
#42. What is the part of the heart that the arrows are pointing to?
#43. Which of the following descriptions best matches the hormonal system?
#44. Which system is responsible for ensuring the supply of oxygen and glucose to cells?
#45. In diffusion – are particles travelling with or against the concentration gradient?
#46. Cells are adapted to perform a specific function. Why do cells in the pancreas have lots of ribosomes?
#47. What is the role of receptors?
#48. What is the field of view of a microscope?
#49. What is the resolution of electron microscopes limited by?
#50. Where does blood from the pulmonary artery travel to?
#51. What is the cell wall made from in bacteria?
#52. How are cells that line the small intestine specialised?
#53. How many chambers does the heart have?
#54. Which process in the body produces carbon dioxide?
#55. Which description most accurately describes osmosis?
#56. What travels along neurones to pass information through the nervous system?
#57. Is active transport an active or a passive process?
#58. The male gametes (sperm cells) are adapted to their function. Which of the following are adaptations of sperm cells?
Select all that apply:
#59. Resting metabolic rate is measured under which of the following conditions?
Select all that apply: