POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A patient with a rare genetic disorder has a mutation in the gene encoding the protein dystrophin. Which of the following statements best describes the relationship between dystrophin and the dystrophin-associated protein complex (DAPC)?
A. Dystrophin is a component of the DAPC and plays a crucial role in its assembly
B. Dystrophin is a regulatory subunit of the DAPC and inhibits its activity
C. Dystrophin is a structural component of the DAPC and provides mechanical stability
D. Dystrophin is a signaling molecule that interacts with the DAPC to regulate muscle function
Question 2
In a population of 1000 individuals, 20% are heterozygous for a particular gene. If 10% of the population are homozygous dominant and 70% are homozygous recessive, what is the frequency of the dominant allele?
A. 0.3
B. 0.2
C. 0.1
D. 0.05
Question 3
A researcher is studying the effect of a new medication on blood pressure in patients with hypertension. The researcher wants to compare the mean blood pressure of patients taking the new medication with the mean blood pressure of patients taking a placebo. Which statistical test would be most appropriate for this study?
A. t-test
B. ANOVA
C. Regression analysis
D. Chi-square test
Question 4
A patient with a rare genetic disorder has a mutation in the gene encoding the protein cystic fibrosis transmembrane conduc\tance regulator (CFTR). Which of the following statements best describes the relationship between CFTR and the regulation of chloride ion transport across epithelial cell membranes?
A. CFTR is a chloride channel that regulates the transport of chloride ions across epithelial cell membranes
B. CFTR is a regulatory subunit of the epithelial sodium channel and inhibits its activity
C. CFTR is a structural component of the tight junctions between epithelial cells and provides mechanical stability
D. CFTR is a signaling molecule that interacts with the epithelial sodium channel to regulate sodium ion transport
Question 5
The diagram below shows a simple circuit with a battery, a resistor, and a light bulb. What is the function of the resistor?
A. To reduce the voltage of the battery
B. To increase the current flowing through the circuit
C. To reduce the current flowing through the circuit
D. To increase the voltage of the battery
Question 6
In the context of cell division, what is the primary function of the centrioles during the prophase stage?
A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope
Question 7
The diagram below represents a cross between two true-breeding lines of maize. What is the probability that a progeny will be tall?
A. 0.5
B. 0.75
C. 0.25
D. 0.33
Question 8
A researcher is studying the effects of a new compound on the activity of the enzyme cytochrome P450. Which of the following statements best describes the mechanism by which the compound induces the expression of the cytochrome P450 gene?
A. The compound binds to the aryl hydrocarbon receptor and activates its transcriptional activity
B. The compound binds to the pregnane X receptor and activates its transcriptional activity
C. The compound forms a covalent bond with the cytochrome P450 enzyme and irreversibly inhibits it
D. The compound increases the activity of the cytochrome P450 enzyme by stabilizing its conformation
Question 9
A 10 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 2.0
B. 2.0
C. 2.0
D. 2.0
Question 10
The process of mitosis involves the replication of DNA and the separation of chromosomes. What is the term for the stage of mitosis where the chromosomes are condensed and attached to the spindle fibers?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 11
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'RR'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 12
What is the primary function of the Golgi apparatus in eukaryotic cells?
A. To synthesize proteins
B. To break down proteins
C. To modify and package proteins for transport
D. To synthesize lipids
Question 13
The diagram below shows a plant cell with a large central vacuole. What is the function of the vacuole?
A. Storage of nutrients and waste products
B. Regulation of cell turgor pressure
C. Production of enzymes
D. Maintenance of cell shape
Question 14
The xylem sap of a plant contains 0.5 M sucrose and 0.2 M glu\cose. What is the total concentration of solutes in the xylem sap?
A. 0.7 M
B. 0.8 M
C. 0.9 M
D. 1.0 M
Question 15
A 25-year-old woman presents with primary amenorrhea. Her karyotype is 46,XX. What is the most likely cause of her condition?
A. Turner syndrome
B. Androgen insensitivity syndrome
C. Mayer-Roki\tansky-Küster-Hauser syndrome
D. Swyer syndrome

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