IB Biology Paper 2 Questions and Answers, Exams of Chemistry

Download IB Biology Paper 2 Questions and Answers and more Exams Chemistry in PDF only on Docsity! M22 IB Biology Paper 2 Questions and Answers Latest Update Describe the effect of neonicotinoid pesticides on the nervous system of insects. - Correct Answer They block synaptic transmission They bind to receptors State the cumulative increase in the mass of control colonies at 7 weeks. - Correct Answer 230 grams Compare and contrast the cumulative increase in mass of three groups of colonies once they were placed in the field. - Correct Answer All three groups decreased in cumulative mass gain after 6 weeks Colonies exposed to high concentration always had the lowest cumulative gain Suggest a reason for the changes in mass in the colonies between week 6 and 8 - Correct Answer Less production of honey Fewer bees Using the data in the graph, predict how the use of neonicotinoid pesticides will affect bumblebee populations. - Correct Answer A number of populations will decrease Without new queens, new colonies cannot be founded New colonies are essential to maintain bumblebee populations Identify the species whose eggs are most affected by a high dose of neonicotinoid. - Correct Answer B. locorum Describe the overall effects of low and high doses of neonicotinoid on the egg lengths of all four species. - Correct Answer Low doses caused a decrease in the average egg length in 3 species High doses caused lower average results in all 4 species compared to the control Deduce, based on the data presented, whether the levels of neonicotinoids used in agriculture cause direct harm to B. terrestris - Correct Answer Yes, as both doses affect the overall development of colonies negatively Yes, as decreased numbers of queens will likely affect their reproductive capabilities State the main characteristic of stem cells - Correct Answer Undifferentiated Can differentiate into any type of cells State one therapeutic use of stem cells - Correct Answer Treatment of Stargardt's disease/leukemia Discuss how the use of stem cells to treat hereditary diseases could affect the person who received the treatment and their progeny. - Correct Answer It could improve the quality of life of the treated person The disease could still be passed on to progeny if the defective gene is not changed Describe anaerobic respirations in humans and in yeast - Correct Answer Anaerobic respiration occurs when there is no oxygen Anaerobic respiration in yeast produces ethanol and CO2 + yields a small amount of ATP Anaerobic respiration in humans happens in muscles where lactate is produced Distinguish between the thermal properties of water and methane - Correct Answer Water has a higher boiling point Water has a higher specific heat capacity Explain the role of methane in climate change - Correct Answer Methane is one of the most powerful greenhouse gasses Which causes an increase in temperature in the atmosphere Methane has a shorter lifespan than CO2, but is more powerful than it State where melatonin is produced in the body - Correct Answer Pineal gland Describe one difference between melatonin levels of the day and night workers - Correct Answer Melatonin levels are lower in night workers Deduce, with reason, what time of day would be a good time to take melatonin if you have traveled over several different time zones and are jet-lagged on your arrival. - Correct Answer Time that is in the range of local standard bed time To reestablish the circadian rhythm Explain how the appearance of membranes in electron micrographs was used as evidence to support the Davson-Danielli model. - Correct Answer The black lines represent proteins 2 membrane layers can be seen There is a clear layer in the center that is composed of phospholipids Explain the decrease in activity of the enzyme on either side of the optimum temperature - Correct Answer As the temperature increases, the enzyme becomes denatured As the temperature decreases, the enzyme molecules have less kinetic energy In biotechnology, enzymes are used to transfer genes to bacteria. Outline how two specific enzymes are used for the transfer. - Correct Answer Restriction enzymes