Biology WBI15/01 November 2021 | Edexcel International A Level Past Papers With Mark Scheme
Edexcel
International AS/A Level
Biology (WBI)
Nov
2021
2. genetic engineering of rice—β-carotene biosynthesis gene transfer from soil bacteria, transcription and translation in rice genome, vitamin A deficiency mitigation
3. retinal response to light—rod cell photopigment change, bipolar neurone potential shift with light intensity, pupil diameter regulation by iris muscles
4. homeostasis—negative vs positive feedback, thermoregulation at 37 °C, glomerular filtration of creatinine, GFR calculation, insulin sensitivity restoration post-surgery
5. aerobic/anaerobic respiration—oxygen consumption and CO₂ production in insects, metabolic rate calculation, lactate production vs body mass in crocodiles
6. immune response—T lymphocyte activation, cytokine secretion and function, DNA replication by polymerase, alternative splicing of CD45 gene for protein diversity
معلم موافق رایگان بودن است.
1. muscle contraction mechanism—calcium ion role in actin-myosin binding, troponin-tropomyosin interaction, cross-bridge formation2. genetic engineering of rice—β-carotene biosynthesis gene transfer from soil bacteria, transcription and translation in rice genome, vitamin A deficiency mitigation
3. retinal response to light—rod cell photopigment change, bipolar neurone potential shift with light intensity, pupil diameter regulation by iris muscles
4. homeostasis—negative vs positive feedback, thermoregulation at 37 °C, glomerular filtration of creatinine, GFR calculation, insulin sensitivity restoration post-surgery
5. aerobic/anaerobic respiration—oxygen consumption and CO₂ production in insects, metabolic rate calculation, lactate production vs body mass in crocodiles
6. immune response—T lymphocyte activation, cytokine secretion and function, DNA replication by polymerase, alternative splicing of CD45 gene for protein diversity
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omer uner 
