POST UTME OSUSTECH 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of evolutionary theory, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 2
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Control of hunger and thirst
C. Stimulation of the pituitary gland
D. Regulation of sleep-wake cycles
Question 3
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7. What is the likely reason for this observation?
A. The microorganism is a neutralophile
B. The microorganism is a acidophile
C. The microorganism is a alkalophile
D. The microorganism is a halophile
Question 4
A microorganism is capable of cau\sing disease in humans. Which of the following characteristics is most likely responsible for its pathogenicity?
A. Ability to produce toxins
B. Ability to invade host cells
C. Ability to evade host immune system
D. Ability to form biofilms
Question 5
A researcher studies the population dynamics of a species in a specific biome. Which of the following is a likely consequence of changes in the species' population size?
A. Predator-Prey Cycles
B. Competition for Resources
C. Niche Partitioning
D. Eco\logical Succession
Question 6
A researcher isolates a microorganism that exhibits antibiotic resis\tance. Which of the following is a likely mechanism underlying this resis\tance?
A. Horizontal Gene Transfer
B. Vertical Gene Transfer
C. Mutation
D. Gene Expression
Question 7
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 25% per year, what is the population after 5 years?
A. 3125
B. 625
C. 125
D. 25
Question 8
A patient is experiencing symptoms of a heart condition. Which of the following types of tissue is most likely affected?
A. Cardiac muscle
B. Smooth muscle
C. Skeletal muscle
D. Connective tissue
Question 9
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's turgor pressure?
A. Increase
B. Decrease
C. Remain the same
D. Become negative
Question 10
A researcher isolates a bacterium that is resis\tant to ampicillin. The bacterium's DNA is analyzed, and it is found to have a mutation in the gene encoding the \beta-lactamase enzyme. What is the likely effect of this mutation on the bacterium's ability to produce \beta-lactamase?
A. Increased production of \beta-lactamase
B. Decreased production of \beta-lactamase
C. No effect on \beta-lactamase production
D. Increased sensitivity to ampicillin
Question 11
A diagram of the cell cycle is shown below. What is the primary function of the G2 phase in the process of cell division?
A. To prepare the cell for mitosis by replicating DNA
B. To regulate the release of cyclin-dep\endent kinases to increase cell growth
C. To control the release of checkpoint proteins to increase cell cycle arrest
D. To increase the sensitivity of the cell to DNA damage
Question 12
In the context of sexual reproduction, what is the primary function of the acrosome reaction in the sperm cell?
A. To release enzymes that break down the zona pellucida
B. To facilitate the fusion of the sperm and egg membranes
C. To increase the motility of the sperm
D. To enhance the binding of the sperm to the zona pellucida
Question 13
The process of gas exchange in the lungs involves the diffusion of oxygen and carbon dioxide across the alveolar-capillary membrane. Which of the following factors is most likely to affect the rate of gas exchange?
A. Partial pressure of oxygen
B. Partial pressure of carbon dioxide
C. Surface area of alveoli
D. Thickness of alveolar-capillary membrane
Question 14
A diagram of the eye is shown below. What is the primary function of the retina in the process of vision?
A. To detect light and transmit signals to the brain
B. To regulate the release of melatonin to increase sleepiness
C. To control the release of dopamine to increase alertness
D. To increase the sensitivity of the eye to light
Question 15
A diagram of the water cycle is shown below. What is the primary mechanism driving the movement of water from the ocean to the atmosphere?
A. Evaporation
B. Condensation
C. Precipitation
D. Runoff

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