Student Name: ______________________________ BIOLOGY SL Cohort – DP2 April 2023 Final Exam Teacher: Duration of Exam: Total number of pages: Ms. Muntaka Saima Syeda 60 minutes 7 (including cover page) INSTRUCTIONS TO CANDIDATES: ● Answer all short-answer and extended-response questions on the lines provided. ALLOWED MATERIALS: Pen, Pencil, Ruler, Eraser MARKING AND GRADING: Total Score: /50 Percentage: /100 IB Grade: /7 DO NOT WRITE ON THIS PAGE 2 1. The human circulatory system is structured to serve the organs and tissues of the body efficiently. a) Outline the exchange of materials between capillaries and tissues [3] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ b) Describe what happens in the alveoli [4] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 2. Outline how overpopulation of a species in a given environment may lead to evolution. 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Living organisms have been placed in three domains: archaea, eubacteria, and eukaryote. a) Distinguish eukaryotic cells from eubacteria cells. [3] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 4. List two factors that could cause a decrease in the size of an animal population [2] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 5. Explain the propagation of electrical impulses along a neuron including the role of myelin. 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Define the terms species, population and community. [3] species: _________________________________________________________________________________________________ _________________________________________________________________________________________________ population: _________________________________________________________________________________________________ _________________________________________________________________________________________________ community: _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ 7. Explain the shape of the pyramids of energy that are constructed by ecologists to represent energy flow in an ecosystem. 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State the type of bonds that [2] a) connect base pairs in a DNA molecule ______________________________________________________________________________________________________________ b) link DNA nucleotides into a single strand ______________________________________________________________________________________________________________ 9. Distinguish between DNA and RNA nucleotides by giving two differences in the chemical structure of the molecules [2] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 5 10. State one differences in function and one difference in structure between plant and animal cells. [2] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 11. Outline how molecules move across a membrane by facilitated diffusion [2] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 12. Outline the steps of DNA replication. [4] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ 13. Outline, with examples, the types of fats found in living organisms. [4] ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ 6 14. Explain how a genetic mutation causes Sickle Cell Anemia. 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