POST UTME UNILORIN 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of temperature on the rate of enzyme-catalyzed reactions. Which of the following best describes the relationship between temperature and the rate of enzyme-catalyzed reactions?
A. As temperature increases, the rate of enzyme-catalyzed reactions increases.
B. As temperature decreases, the rate of enzyme-catalyzed reactions increases.
C. The rate of enzyme-catalyzed reactions remains cons\tant regardless of temperature.
D. The rate of enzyme-catalyzed reactions decreases as temperature increases.
Question 2
In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope
Question 3
A person with a blood pressure of 120/80 mmHg is taking a blood sample. If the blood sample is placed in a tube with a diameter of 1.5 cm and a length of 10 cm, what is the pressure exerted by the blood on the tube wall?
A. 0.5 kPa
B. 1.2 kPa
C. 2.5 kPa
D. 3.8 kPa
Question 4
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 5
A species of plant has a photosynthetic rate of 10 mg CO2 per hour. If the plant is exposed to light for 8 hours, what is the total amount of CO2 fixed by the plant?
A. 80 mg
B. 100 mg
C. 120 mg
D. 160 mg
Question 6
The process of mitosis in a cell can be described by the equation (P(t) = P_0 left\( 1 - \frac{t}{\tau}\right \)^n), where (P(t)) is the population size at time (t), \( P_0 \) is the initial population size, \( \tau \) is the characteristic time, and (n) is the number of generations. If the population size increases to 200 individuals after 5 generations, what is the value of (n)?
A. 3
B. 5
C. 7
D. 9
Question 7
A study on the genetic basis of antibiotic resis\tance in bacteria reveals that the resis\tance gene is located on a plasmid. Which of the following best describes the relationship between the plasmid and the bacterial chromosome?
A. The plasmid is a self-replicating circular DNA molecule that can replicate indep\endently of the bacterial chromosome.
B. The plasmid is a linear DNA molecule that is integrated into the bacterial chromosome.
C. The plasmid is a small DNA molecule that is attached to the bacterial chromosome.
D. The plasmid is a DNA molecule that is responsible for encoding the bacterial chromosome.
Question 8
The rate of diffusion of a subs\tance is influenced by
A. Temperature
B. Concentration gradient
C. Surface area
D. Time
Question 9
A patient is diagnosed with a genetic disorder that is caused by a mutation in a specific gene. Which of the following best describes the relationship between the mutation and the genetic disorder?
A. The mutation causes a change in the amino acid sequence of the protein encoded by the gene.
B. The mutation causes a change in the regulation of the gene.
C. The mutation causes a change in the expression of the gene.
D. The mutation causes a change in the structure of the gene.
Question 10
A population of bacteria is growing exponentially with a growth rate of 0.05 h^-1. If the initial population is 10^5 cells, what is the population after 5 hours?
A. 1.32 \times 10^6
B. 1.65 \times 10^6
C. 2.10 \times 10^6
D. 2.55 \times 10^6
Question 11
A diagram of the human nervous system is shown below. Which part of the brain is responsible for controlling voluntary movements?
A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal Cord
Question 12
The process of photosynthesis in plants involves the conversion of
A. Carbon dioxide to glu\cose
B. Glu\cose to carbon dioxide
C. Water to oxygen
D. Oxygen to water
Question 13
A 0.1 M solution of glu\cose is prepared by dissolving 2 g of glu\cose in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A patient has a blood glu\cose level of 120 mg/dL. What is the approximate concentration of glu\cose in the patient's blood?
A. 1.2 g/dL
B. 2.4 g/dL
C. 3.6 g/dL
D. 4.8 g/dL
Question 15
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 recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.16
D. 0.32

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