POST UTME WELLSPRING UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
A. 0.64
B. 0.36
C. 0.16
D. 0.04
Question 2
In a photosynthetic organism, the light-dep\endent reactions occur in the thylakoid membranes of the chloroplasts. Which of the following is the primary function of the light-indep\endent reactions?
A. To generate ATP and NADPH
B. To synthesize glu\cose from CO2 and H2O
C. To produce oxygen as a byproduct
D. To regulate the Calvin cycle
Question 3
A 2.0-m tall plant has a leaf area index of 4. If the plant is exposed to a light intensity of 200 μmol/m^2/s, what is the rate of photosynthesis?
A. 10 μmol CO2/s
B. 20 μmol CO2/s
C. 30 μmol CO2/s
D. 40 μmol CO2/s
Question 4
A plant has a root system with a total surface area of 100 cm^2. If the root system is 50% covered with a root hair layer, what is the surface area of the root hair layer?
A. 25 cm^2
B. 50 cm^2
C. 75 cm^2
D. 100 cm^2
Question 5
A 50-kg person is running at a speed of 5 m/s. If the person's metabolic rate is 200 W, what is the rate of heat loss from the person's body?
A. 100 W
B. 150 W
C. 200 W
D. 250 W
Question 6
A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following is an example of a genetic variation that can be observed in this population?
A. A change in the frequency of a particular allele
B. A change in the frequency of a particular trait
C. A change in the frequency of a particular gene
D. A change in the frequency of a particular species
Question 7
A 50g sample of glu\cose is digested by the enzyme amylase. If the reaction is 90% complete, how many grams of glu\cose remain?
A. 20g
B. 30g
C. 40g
D. 45g
Question 8
A study on the eco\logy of a freshwater lake revealed that the primary producers of the lake are phytoplankton, which are responsible for 70% of the lake's oxygen production. However, the introduction of a new species of zooplankton has led to a 30% decrease in phytoplankton population. What is the likely effect on the lake's oxygen production?
A. A 30% decrease in oxygen production
B. No change in oxygen production
C. A 10% increase in oxygen production
D. A 20% increase in oxygen production
Question 9
A researcher is studying the effects of climate change on e\cosystems. Which of the following is a consequence of ri\sing global temperatures?
A. Increased biodiversity
B. Decreased greenhouse gas emissions
C. Polar ice cap melting
D. Increased ocean acidification
Question 10
A population of bacteria is growing exponentially. If the initial population size is 100 and the population size after 3 hours is 200, what is the growth rate of the population?
A. 10% per hour
B. 20% per hour
C. 30% per hour
D. 40% per hour
Question 11
In the process of mitosis, what is the primary function of the spindle fibers?
A. To separate the chromosomes during anaphase
B. To attach the sister chromatids during prophase
C. To move the chromosomes to the poles during metaphase
D. To condense the chromosomes during prophase
Question 12
In the context of osmoregulation, what is the primary function of the hormone vasopres\sin?
A. To increase water reabsorption in the kidneys
B. To decrease water reabsorption in the kidneys
C. To increase urine production
D. To decrease urine production
Question 13
A cell is in the process of cell division. Which of the following stages is characterized by the separation of the sister chromatids?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 14
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. The patient's white blood cell count is 10,000 cells/μL. Which of the following is the most likely effect of the infection on the patient's immune system?
A. A decrease in white blood cell count
B. An increase in white blood cell count
C. No change in white blood cell count
D. A decrease in the patient's overall health
Question 15
In the context of genetics, what is the primary function of the gene regulatory elements?
A. To regulate gene expression by binding to specific DNA sequences
B. To encode proteins that are involved in gene regulation
C. To catalyze chemical reactions that are involved in gene regulation
D. To transport molecules across cell membranes

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