POST UTME ACHIEVERS UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The human immune system is composed of various cells and organs that work together to protect the body against pathogens. Which of the following cells is responsible for the production of antibodies?
A. B cells
B. T cells
C. Macrophages
D. Neutrophils
Question 2
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
B. Genetic recombination
C. Gene duplication
D. Gene deletion
Question 3
A microorganism is isolated from a patient's blood culture and identified as Staphylococcus aureus. The organism is resis\tant to methicillin and has a minimum inhibitory concentration (MIC) of 16 μg/mL for vancomycin. What is the most likely mechanism of resis\tance?
A. Efflux pump-mediated resis\tance
B. Enzymatic inactivation of vancomycin
C. Target modification of the vancomycin binding site
D. Increased expression of the vancomycin target gene
Question 4
A patient is experiencing symptoms of kidney failure. Which of the following organs is responsible for filtering waste products from the blood?
A. Liver
B. Kidneys
C. Lungs
D. Heart
Question 5
A diagram of the human skeletal system is shown below. Identify the type of joint that connects the humerus and radius bones.
A. Ball-and-socket joint
B. Hinge joint
C. Pivot joint
D. Saddle joint
Question 6
The diagram below shows a cross-section of a plant root. Identify the structure labeled 'A'.
A. Epidermis
B. Cortex
C. Endodermis
D. Pericycle
Question 7
In the context of cell division, what is the primary function of the centrioles?
A. To form the spindle fibers
B. To separate the chromosomes
C. To form the nuclear envelope
D. To synthesize DNA
Question 8
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To transport water and minerals
B. To store starch and other nutrients
C. To produce \tannins and other defense compounds
D. To regulate water potential
Question 9
A population of Drosophila melanogaster is being studied for its genetic variation. The population has a mean wing length of 5.2 mm and a s\tandard deviation of 0.8 mm. If a sample of 16 flies is taken from the population, what is the probability that the sample mean wing length will be greater than 5.5 mm?
A. 0.05
B. 0.01
C. 0.005
D. 0.0005
Question 10
What is the primary mechanism by which microorganisms cause disease in humans?
A. Invasion of host cells
B. Toxin production
C. Immune system suppression
D. Antibiotic resis\tance
Question 11
In the nervous system, what is the primary function of the axon hillock?
A. To generate action potentials
B. To transmit signals to other neurons
C. To synthesize neurotransmitters
D. To regulate ion channels
Question 12
A population of bacteria is growing exponentially. If the initial population is 1000 and the growth rate is 20% per hour, what is the population after 3 hours?
A. 1600
B. 2000
C. 2400
D. 3000
Question 13
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most effective against this pathogen?
A. Penicillin
B. Erythromycin
C. Vancomycin
D. Ciprofloxacin
Question 14
A diagram of a simple circuit is shown below. What is the primary function of the resistor in this circuit?
A. To reduce the voltage across the light bulb
B. To increase the current flowing through the light bulb
C. To regulate the temperature of the light bulb
D. To control the brightness of the light bulb
Question 15
A diagram of a human eye is shown below. What is the function of the retina?
A. Detects light
B. Regulates pupil size
C. Focuses light
D. Transmits visual signals to the brain

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