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IB Biology EE Exemplars

View exemplars for IB Biology EE coursework, verified with scores by IB examiners.

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To what extent do genetics or environmental factors have a larger role in determining gene expression respectively, as researched in monozygotic twin model studies and observations in DNA methylation changes? - Biology EE exemplar scored A

To what extent do genetics or environmental factors have a larger role in determining gene expression respectively, as researched in monozygotic twin model studies and observations in DNA methylation changes?

How do different concentrations (0.0, 0.1, 0.5 and 50 mM)
of glucose affect the germination rate of wheat seeds (Triticum aestivum) under
salinity stress (200 mM NaCl) over 5 days? - Biology EE exemplar scored A

How do different concentrations (0.0, 0.1, 0.5 and 50 mM) of glucose affect the germination rate of wheat seeds (Triticum aestivum) under salinity stress (200 mM NaCl) over 5 days?

How does susceptibility to metabolic syndrome (measured by physical body parameters, blood profile & lifestyle factors) correlate with muscle strength measured by handgrip dynamometry in females aged 35-50?

What is the effect of varying concentrations of salicylic acid (0.25, 0.50, 1.00, 1.50, 2.00 ± 0.05 mM) on the seed germination (7 days) of radish (Raphanus sativus L) under salt stress (150μM) measured by mitotic index(%) and root length ,while keeping the light exposure (no light), salicylic acid pre treatment time (24.0) of seeds and germination time (7days) constant? - Biology EE exemplar scored A

What is the effect of varying concentrations of salicylic acid (0.25, 0.50, 1.00, 1.50, 2.00 ± 0.05 mM) on the seed germination (7 days) of radish (Raphanus sativus L) under salt stress (150μM) measured by mitotic index(%) and root length ,while keeping the light exposure (no light), salicylic acid pre treatment time (24.0) of seeds and germination time (7days) constant?

To what extent does varying the quantity of Himalayan honey (2, 4, 6, 8, 10 mL) affect the
hydrolysis of starch (extracted from 60 g of pre-soaked Oryza sativa L.brown rice) into
reducing sugars, when incubated for 30 minutes and measured by the absorbance change of
the honey-starch-Benedict's solution & honey-starch- iodine solution using a
spectrophotometer at 540 nm and 615 nm respectively ? - Biology EE exemplar scored A

To what extent does varying the quantity of Himalayan honey (2, 4, 6, 8, 10 mL) affect the hydrolysis of starch (extracted from 60 g of pre-soaked Oryza sativa L.brown rice) into reducing sugars, when incubated for 30 minutes and measured by the absorbance change of the honey-starch-Benedict's solution & honey-starch- iodine solution using a spectrophotometer at 540 nm and 615 nm respectively ?

What are the differences in cytotoxicity and apparent permeability of two nanoparticle formulations (B1 and B2) with varying ligand concentrations (0%mol, 2%mol, 4%mol, 6%mol, 8%mol, and 10%mol) at five time points (30 min., 45 min., 60 min., 90 min., 120 min.) across the Blood-Brain Barrier, using traditional and inverted in vitro models with bEnd.3 endothelial mouse cells over a 7-day period, for potential Alzheimer’s disease treatment? - Biology EE exemplar scored A

What are the differences in cytotoxicity and apparent permeability of two nanoparticle formulations (B1 and B2) with varying ligand concentrations (0%mol, 2%mol, 4%mol, 6%mol, 8%mol, and 10%mol) at five time points (30 min., 45 min., 60 min., 90 min., 120 min.) across the Blood-Brain Barrier, using traditional and inverted in vitro models with bEnd.3 endothelial mouse cells over a 7-day period, for potential Alzheimer’s disease treatment?

To what extent does urbanization impact the avian diversity and native population in the United States Midwestern ecosystems? - Biology EE exemplar scored A

To what extent does urbanization impact the avian diversity and native population in the United States Midwestern ecosystems?

To what extent does Vitamin C in varied concentrations (0.00, 0.25, 1.00, 1.25, 1.67 mg/cm3) impact oxidative stress in eukaryotic cells observed in Saccharomyces cerevisiae (yeast) measured through catalase enzyme action by comparing the volume of oxygen gas released through the length of bubbling(±0.05)? - Biology EE exemplar scored A

To what extent does Vitamin C in varied concentrations (0.00, 0.25, 1.00, 1.25, 1.67 mg/cm3) impact oxidative stress in eukaryotic cells observed in Saccharomyces cerevisiae (yeast) measured through catalase enzyme action by comparing the volume of oxygen gas released through the length of bubbling(±0.05)?

To what extent do metal ions (silver, copper, barium, and zinc)
affect the inhibition of Lactobacillus acidophilus growth at different concentrations
(1 M, 0.1 M, 0.01M, 0.001 M) in 24 hours as measured by the zone of inhibition? - Biology EE exemplar scored A

To what extent do metal ions (silver, copper, barium, and zinc) affect the inhibition of Lactobacillus acidophilus growth at different concentrations (1 M, 0.1 M, 0.01M, 0.001 M) in 24 hours as measured by the zone of inhibition?

How do different wavelengths of light (blue: 450–495 nm, red: 620–750 nm, green: 495–570 nm, white: 400–700 nm, and yellow light: 560-590nm), affect the rate of photosynthesis in Elodea canadensis (Elodea plant), as measured by the pH change of sodium hydrogen carbonate solution (NaHCO3) with an initial pH 8.30 0.05, using a pH meter for 2 hours? - Biology EE exemplar scored A

How do different wavelengths of light (blue: 450–495 nm, red: 620–750 nm, green: 495–570 nm, white: 400–700 nm, and yellow light: 560-590nm), affect the rate of photosynthesis in Elodea canadensis (Elodea plant), as measured by the pH change of sodium hydrogen carbonate solution (NaHCO3) with an initial pH 8.30 0.05, using a pH meter for 2 hours?

¿En qué medida se ve afectada la densidad estomática y la apertura estomática de plantas de Spinacia oleracea cuando son expuestas a salinidades de 0 mEq/L, 20 mEq/L, 40 mEq/L, 60 mEq/L, 80 mEq/L; temperaturas de 4ºC, 8ºC, 12ºC, 16ºC, 20ºC; déficit (-50%, -75%) o exceso de agua (+50%,+100%); y el uso o no de fertilizante (7 ml/L) al haber sido aplicados estos tratamientos durante 7 días a plantas de 10 días desde la siembra? - Biology EE exemplar scored B

¿En qué medida se ve afectada la densidad estomática y la apertura estomática de plantas de Spinacia oleracea cuando son expuestas a salinidades de 0 mEq/L, 20 mEq/L, 40 mEq/L, 60 mEq/L, 80 mEq/L; temperaturas de 4ºC, 8ºC, 12ºC, 16ºC, 20ºC; déficit (-50%, -75%) o exceso de agua (+50%,+100%); y el uso o no de fertilizante (7 ml/L) al haber sido aplicados estos tratamientos durante 7 días a plantas de 10 días desde la siembra?

To what extent does meat consumption (kg per capita per year) of different types of meat (Beef, Pork, Poultry, Fish and Seafood) influence the prevalence of cardiovascular diseases in a globally representative sample of 50 countries - Biology EE exemplar scored B

To what extent does meat consumption (kg per capita per year) of different types of meat (Beef, Pork, Poultry, Fish and Seafood) influence the prevalence of cardiovascular diseases in a globally representative sample of 50 countries

To what extent does Body Condition Score (1-9) and body mass (kg) impact resting and
active heart rate (beats per minute) in purebred canines (Canis lupus familiaris)? - Biology EE exemplar scored B

To what extent does Body Condition Score (1-9) and body mass (kg) impact resting and active heart rate (beats per minute) in purebred canines (Canis lupus familiaris)?

A study into the possible relationship of blood pressure and the onset of Alzheimer’s disease in individuals aged fifty years and above. - Biology EE exemplar scored B

A study into the possible relationship of blood pressure and the onset of Alzheimer’s disease in individuals aged fifty years and above.

How do Zinc Sulfate, Aluminium Sulfate, Lead Nitrate and Lithium Chloride affect the
activity of phosphatase enzymes in mung bean sprouts (Vigna radiata)? - Biology EE exemplar scored B

How do Zinc Sulfate, Aluminium Sulfate, Lead Nitrate and Lithium Chloride affect the activity of phosphatase enzymes in mung bean sprouts (Vigna radiata)?

The antimicrobial effects of 1M metal salts, Cu(NO3)2 Fe(NO3)3 Zn(NO3)2 Ni(NO3)2 and Pb(NO3)2 on the growth of bacteria. - Biology EE exemplar scored B

The antimicrobial effects of 1M metal salts, Cu(NO3)2 Fe(NO3)3 Zn(NO3)2 Ni(NO3)2 and Pb(NO3)2 on the growth of bacteria.

To what extent does the duration of vaping (in months) affect the forced vital capacity (l) to height (cm) ratio in the population in Hanoi born in 1999-2008? - Biology EE exemplar scored B

To what extent does the duration of vaping (in months) affect the forced vital capacity (l) to height (cm) ratio in the population in Hanoi born in 1999-2008?

To what extent do varying concentrations of Kalanchoe (Bryophyllum pinnatum)
extract inhibits the proliferation of K-12 Escherichia coli and Staphylococcus
aureus in LB Agar Petri dishes? - Biology EE exemplar scored B

To what extent do varying concentrations of Kalanchoe (Bryophyllum pinnatum) extract inhibits the proliferation of K-12 Escherichia coli and Staphylococcus aureus in LB Agar Petri dishes?

Investigating the Effect of The Rhizophagus intraradices Fungus on Nutrient Uptake and Growth in Mentha spicata Plants under Different Phosphorus Conditions - Biology EE exemplar scored B

Investigating the Effect of The Rhizophagus intraradices Fungus on Nutrient Uptake and Growth in Mentha spicata Plants under Different Phosphorus Conditions

¿Qué hace al virus de la rabia tan mortal en comparación con otros virus neurotrópicos? - Biology EE exemplar scored B

¿Qué hace al virus de la rabia tan mortal en comparación con otros virus neurotrópicos?

What is the predominant seasonal allergy in the demographic group; ages 16+, and by then, is there a correlation of their specific blood type and a higher incidence of the allergy in South Korea? - Biology EE exemplar scored B

What is the predominant seasonal allergy in the demographic group; ages 16+, and by then, is there a correlation of their specific blood type and a higher incidence of the allergy in South Korea?

How do pesticides cause misfolding of proteins measured by the pathogenesis of neurodegenerative diseases, focusing on Parkinson’s? - Biology EE exemplar scored B

How do pesticides cause misfolding of proteins measured by the pathogenesis of neurodegenerative diseases, focusing on Parkinson’s?

How do varying concentrations of potassium nitrate (KNO3) (0.0 g/dm-3
(control), 25.0 g/dm-3,75.0 g/dm-3, 125.0 g/dm-3, 175.0 g/dm-3, and 225.0 g/dm-3(±0.5 g/dm-3) affect the stem heights of Phaseolus vulgaris (bean plants), measured in mm (±0.05 mm) in a span of 14 days? - Biology EE exemplar scored B

How do varying concentrations of potassium nitrate (KNO3) (0.0 g/dm-3 (control), 25.0 g/dm-3,75.0 g/dm-3, 125.0 g/dm-3, 175.0 g/dm-3, and 225.0 g/dm-3(±0.5 g/dm-3) affect the stem heights of Phaseolus vulgaris (bean plants), measured in mm (±0.05 mm) in a span of 14 days?

To what extent can CTX001 and LentiGlobin treat sickle
cell anemia and which is more effective? - Biology EE exemplar scored B

To what extent can CTX001 and LentiGlobin treat sickle cell anemia and which is more effective?

To what extent does pre-treating bacterial extract of Staphylococcus
Epidermidis with bromelain from pineapple influence the effectiveness of
Tetracycline? - Biology EE exemplar scored B

To what extent does pre-treating bacterial extract of Staphylococcus Epidermidis with bromelain from pineapple influence the effectiveness of Tetracycline?

HOW DO DIFFERENT CONCENTRATION OF MICROPLASTIC (20 mg/L,
40 mg/L, 60 mg/L, 80 mg/L, 100 mg/L) IN WATER AFFECT GROWTH
RATE OF Hydrilla ver cillata BY MEASURING THE CHANGES IN
LENGTH AND TOTAL CHLOROPHYLL CONTENT AFTER 7 DAYS - Biology EE exemplar scored B

HOW DO DIFFERENT CONCENTRATION OF MICROPLASTIC (20 mg/L, 40 mg/L, 60 mg/L, 80 mg/L, 100 mg/L) IN WATER AFFECT GROWTH RATE OF Hydrilla ver cillata BY MEASURING THE CHANGES IN LENGTH AND TOTAL CHLOROPHYLL CONTENT AFTER 7 DAYS

How Can Gelling Agents Like Agarose, Xanthan, Carrageenan And Gellan Gum Impact The Immobilization Property Of Amylase In Comparison To Sodium Alginate Through Entrapment Method, In Terms of Enzyme Activity and Stability? - Biology EE exemplar scored B

How Can Gelling Agents Like Agarose, Xanthan, Carrageenan And Gellan Gum Impact The Immobilization Property Of Amylase In Comparison To Sodium Alginate Through Entrapment Method, In Terms of Enzyme Activity and Stability?

To what extent does the starch breakdown rate by 1% amylase solution differ between gluten-containing (wheat, rye, spelt) and gluten-free (white corn, rice, chickpea) flour samples? - Biology EE exemplar scored B

To what extent does the starch breakdown rate by 1% amylase solution differ between gluten-containing (wheat, rye, spelt) and gluten-free (white corn, rice, chickpea) flour samples?

To what extent do different concentrations (100%, 75%, 50%, 25%) of Melaleuca alternifornila (tea tree), acetylsalicylic acid and a mixture of both in ratios 75:25, 50:50 and 25:75 (1:3, 1:1 and 3:1) inhibit the growth in area (in mm2) of Cutibacterium acnes cultured in vitro at 25°C for 5 days? - Biology EE exemplar scored B

To what extent do different concentrations (100%, 75%, 50%, 25%) of Melaleuca alternifornila (tea tree), acetylsalicylic acid and a mixture of both in ratios 75:25, 50:50 and 25:75 (1:3, 1:1 and 3:1) inhibit the growth in area (in mm2) of Cutibacterium acnes cultured in vitro at 25°C for 5 days?

How do different temperatures (37°C, 41°C, 42°C, 43°C, 45°C, 47°C, and 50°C) effect the Homo sapiens breast cancer cell line MDA-MB-231 measured by the number of necrotised cells on a heat plate, heat shock protein concentration, and organelle deterioration? - Biology EE exemplar scored B

How do different temperatures (37°C, 41°C, 42°C, 43°C, 45°C, 47°C, and 50°C) effect the Homo sapiens breast cancer cell line MDA-MB-231 measured by the number of necrotised cells on a heat plate, heat shock protein concentration, and organelle deterioration?

Do different extraction temperatures and extract concentrations
affect the size of the zone of inhibition around Bacillus subtilis? - Biology EE exemplar scored B

Do different extraction temperatures and extract concentrations affect the size of the zone of inhibition around Bacillus subtilis?

How do neurological changes and symptoms in humans infected with the rabies virus differ based on the source of transmission, specifically comparing the progression of rabies symptoms between bat-acquired and dog-acquired cases? - Biology EE exemplar scored C

How do neurological changes and symptoms in humans infected with the rabies virus differ based on the source of transmission, specifically comparing the progression of rabies symptoms between bat-acquired and dog-acquired cases?

What are the nutritional differences between processed and unprocessed meat in terms of protein content? (Determined using the Bradford Method) - Biology EE exemplar scored C

What are the nutritional differences between processed and unprocessed meat in terms of protein content? (Determined using the Bradford Method)

To what extent does screen time affect circadian rhythm in terms of daytime alertness and sleep quality? - Biology EE exemplar scored C

To what extent does screen time affect circadian rhythm in terms of daytime alertness and sleep quality?

¿En qué medida la presencia o ausencia de Respuesta Patológica Completa afecta la tasa de
supervivencia general en mujeres mayores de 18 años con cáncer de mama HER2-Positivo
tratadas con quimioterapia neoadyuvante y trastuzumab? - Biology EE exemplar scored C

¿En qué medida la presencia o ausencia de Respuesta Patológica Completa afecta la tasa de supervivencia general en mujeres mayores de 18 años con cáncer de mama HER2-Positivo tratadas con quimioterapia neoadyuvante y trastuzumab?

To what extent are maternal infections related to developing sensorineural hearing loss in children? - Biology EE exemplar scored C

To what extent are maternal infections related to developing sensorineural hearing loss in children?

To what extent can elevated blood glucose be used as an indicator for Wilson's Disease as determined through a model of the function of the digestive enzyme a-amylase in a starch decomposition reaction inhibited by increasing volumes of copper sulphate (0.00, 0.25, 0.50, 0.75, 1.00 mL CuSO4)? - Biology EE exemplar scored C

To what extent can elevated blood glucose be used as an indicator for Wilson's Disease as determined through a model of the function of the digestive enzyme a-amylase in a starch decomposition reaction inhibited by increasing volumes of copper sulphate (0.00, 0.25, 0.50, 0.75, 1.00 mL CuSO4)?

Ketogenic diet and its effect on athlete’s performance by observing changes in VO2 Max - Biology EE exemplar scored C

Ketogenic diet and its effect on athlete’s performance by observing changes in VO2 Max

To what extent does a high ultra-processed food diet affect the cognitive
development of the foetus in Homo sapiens as measured using early-year cognitive tests? - Biology EE exemplar scored C

To what extent does a high ultra-processed food diet affect the cognitive development of the foetus in Homo sapiens as measured using early-year cognitive tests?

To what extent do mutations of HCN4 within the hyperpolarized-activated cyclic nucleotide-gated channel (HCN) family influence the development of familial sick sinus syndrome (SSS)? - Biology EE exemplar scored C

To what extent do mutations of HCN4 within the hyperpolarized-activated cyclic nucleotide-gated channel (HCN) family influence the development of familial sick sinus syndrome (SSS)?

How Do Different Postures (Sitting at 90° Leg Angle, Standing, and Padmasana (Yoga Pose)) Affect the Memory of a Grade 11 Student While Doing a Simple Word Recall Test and an in Hand Visual Memory Test? - Biology EE exemplar scored C

How Do Different Postures (Sitting at 90° Leg Angle, Standing, and Padmasana (Yoga Pose)) Affect the Memory of a Grade 11 Student While Doing a Simple Word Recall Test and an in Hand Visual Memory Test?

How do the chemical components in different shampoos and
conditioners (Kerastase Genesis, Loreal Paris, Fable and Mane), affect the tensile strength (g) of Homo sapiens hair when wet and dry? - Biology EE exemplar scored C

How do the chemical components in different shampoos and conditioners (Kerastase Genesis, Loreal Paris, Fable and Mane), affect the tensile strength (g) of Homo sapiens hair when wet and dry?

To what extent do different dissolved oxygen
concentrations (6 ppm, 12 ppm, 18 ppm) in the nutrient solution of a deep-water culture system impact the leaf number and plant height of hydroponically grown Lactuca sativa (lettuce) over a 15-day growth period? - Biology EE exemplar scored C

To what extent do different dissolved oxygen concentrations (6 ppm, 12 ppm, 18 ppm) in the nutrient solution of a deep-water culture system impact the leaf number and plant height of hydroponically grown Lactuca sativa (lettuce) over a 15-day growth period?

La durabilité économique et environnementale de la pêche du thon rouge dans les écosystèmes marins méditerranéens - Biology EE exemplar scored C

La durabilité économique et environnementale de la pêche du thon rouge dans les écosystèmes marins méditerranéens

To what extent do different concentrations of Sodium Chloride (1, 2, 3, 4, 5%), Sucrose (50, 65, 80, 95, 100%), and Potassium Sorbate (0.05, 0.1, 0.2, 0.4, 0.8%) affect the concentration of Carbon Dioxide produced, measured using a CO2 probe during respiration in brewer’s yeast (Saccharomyces Cerevisiae)? - Biology EE exemplar scored D

To what extent do different concentrations of Sodium Chloride (1, 2, 3, 4, 5%), Sucrose (50, 65, 80, 95, 100%), and Potassium Sorbate (0.05, 0.1, 0.2, 0.4, 0.8%) affect the concentration of Carbon Dioxide produced, measured using a CO2 probe during respiration in brewer’s yeast (Saccharomyces Cerevisiae)?

To what extent does light pollution affect the behaviour of aquatic animals' behaviour in the Chicago city region? - Biology EE exemplar scored D

To what extent does light pollution affect the behaviour of aquatic animals' behaviour in the Chicago city region?