Revision questions for topic B2

• Why can enzymes be described as catalysts?


  Speed up reactions
• Why do enzymes only usually catalyst one reaction?


  Specificity, very picky and require specific enzymes for there active sites
• What does it mean when an enzyme has been denatured?


  Loss of its structure and function.
• Describe how you could investigate the ph on the rate of amylase activity?


  A series of test tubes containing a mixture of starch and amylase is set up at different pHs. A sample is removed from the test tubes every 10 seconds to test for the presence of starch.
• List the three places where amylase is made in the human body?


  Salivary glands, pancreas, small intestine.
• What is the role of lipases?


  To break down lipids.
• Where is bile stored?

  Gallbladder
• Name the solution that you could use to test for the presence of proteins in a food sample?


  Biuret solution
• list bacterial diseases?


  Tuberculosis,

  Cholera,

  Lyme disease,

  Tetanus,

  Syphilis
• What type of tumour is cancerous?

  Malignant
• name the type of cell that helps open and close stomata?

  Guard cells
• What is coronary heart disease?


  Coronary heart disease is a condition where there is a narrowing or blockage of the blood vessels that supply the heart, leading to reduced blood flow and oxygen to the heart muscle.
• How to help the heart?


  Exercise, healthy diet, avoid smoking, manage stress.
• Imapcts of coronary heart disease ?


  Heart attacks,

  chest pain,

  shortness of breath,

  fatigue,

  heart failure.
• What are greenhouse economics in biology ?


  The study of how greenhouse gases affect the Earth's climate.
• What gasses are greenhouse ecenomics?


  Carbon dioxide,

  methane,

  nitrous oxide,

  and fluorinated gases.
• What are the effects of the greenhouse economics?


  Climate change

  warmer climate

  Worse air quality
• What are microscopes in biology ?


  Tools for magnifying small objects.
• what are the benefits of microscopes in biology ?

  Magnification, resolution, visualization.
• What organ system is a brain cell in?


  Nervous system
• What organ system is the red blood cell in?


  Cardiovascular system
• What organ system is a sperm cell in?


  Reproductive
• Explain one way a sperm cell is adapted for its function with exsplanation?


  Tail (flagellum) - helps propel the sperm towards the egg for fertilization.
• What is the name of the process that moves oxygen molecules into cells And why?


  Diffusion is an essential process in cells. They need glucose and oxygen for respiration, which move into them by diffusion.
• Name two substances that move into most cells in the body from the blood?

  Oxygen and glucose.
• What three parts in the body break down food by enzymes In the digestive system?


  Mouth, stomach, small intestine
• What part of the digestive system produces amylase?


  The pancreas and salivary gland
• What are the following part of

  Liver, stomach and small intestines?


  digestive stystem
• What molecules are produced when starch is digested ?


  Glucose (suger)
• What molecules are produced when starch is digested?


  Glucose (sugar)
• Where is the food absorbed into the blood?

  Small intestine
• What is a independent variable ?


  a variable that stands alone and isn't changed by the other variables you are trying to measure
• What colour represents starch?


  Blue or black
• What colour represents no starch?

  orange
• What is the optimum ph for amylase to work?


  Ph7
• Where do plants obtain water from photosynthesis from?


  Soil
• What is the evaporation of water from leaves called?


  Transpiration
• How do u find the rate of water loss from a plant?


  Total mass if water loss divided my time taken
• What can increase the rate of water loss that is not temperature?


  wind
• Witch blood vessel is the vena cava in the heart?


  Section b next to the right atrium