POST UTME CALEB UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The theory of evolution by natural selection was first proposed by
A. Charles Darwin
B. Gregor M\endel
C. Jean-Baptiste Lamarck
D. Alfred Russel Wallace
Question 2
In the context of evolutionary bio\logy, what is the primary mechanism by which genetic drift can lead to the loss of genetic variation in a population?
A. Genetic drift can lead to the loss of genetic variation through the random sampling of alleles in a population.
B. Genetic drift can lead to the loss of genetic variation through the selection of alleles that are more beneficial to the population.
C. Genetic drift can lead to the loss of genetic variation through the mutation of alleles that are less beneficial to the population.
D. Genetic drift can lead to the loss of genetic variation through the migration of alleles from one population to another.
Question 3
A plant cell has a cell wall composed of cellulose, hemicellulose, and pectin. Which of the following is the primary function of the cell wall?
A. To provide structural support and protection to the cell
B. To facilitate the movement of subs\tances in and out of the cell
C. To regulate the cell's osmotic balance
D. To synthesize proteins and other biomolecules
Question 4
A researcher isolates a new species of bacteria that exhibits antibiotic resis\tance. Which of the following is a likely mechanism of resis\tance?
A. Efflux pumps
B. Enzymatic degradation
C. Target modification
D. Outer membrane modification
Question 5
In the xylem transport system, what is the primary function of the tracheids?
A. Transport of water and minerals from roots to leaves
B. Transport of sugars and other organic compounds from leaves to roots
C. Regulation of water potential in plants
D. Maintenance of turgor pressure in plant cells
Question 6
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 7
In the process of mitosis, what is the primary function of the metaphase?
A. Alignment of chromosomes at the metaphase plate
B. Separation of sister chromatids
C. Formation of the spindle apparatus
D. Condensation of chromatin
Question 8
A researcher is studying the effects of light on plant growth. Which of the following wavelengths of light is most beneficial for photosynthesis?
A. Blue light \( 400-500 nm \)
B. Red light \( 600-700 nm \)
C. Green light \( 500-600 nm \)
D. Ultraviolet light \( 100-400 nm \)
Question 9
A diagram of a cell cycle is shown below. Which of the following stages is characterized by the replication of DNA and the formation of a spindle apparatus?
A. Interphase
B. Prophase
C. Metaphase
D. Telophase
Question 10
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
A. The structure labeled 'A' is responsible for detecting light and transmitting visual signals to the brain.
B. The structure labeled 'A' is responsible for regulating the amount of light that enters the eye.
C. The structure labeled 'A' is responsible for focu\sing light onto the retina.
D. The structure labeled 'A' is responsible for producing tears to lubricate the eye.
Question 11
A plant has a mutation that causes it to produce a protein that is 20% less efficient than the wild-type protein. If the plant produces 100 units of the wild-type protein, how many units of the mutated protein will it produce?
A. 80
B. 90
C. 100
D. 110
Question 12
A diagram of a human eye is shown below. Which of the following structures is responsible for detecting light and transmitting visual signals to the brain?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 13
A patient is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid phenylalanine. Which of the following enzymes is deficient in this disorder?
A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase
Question 14
The process of meiosis in a diploid organism results in the production of how many haploid cells?
A. 2
B. 4
C. 6
D. 8
Question 15
In the context of reproductive bio\logy, what is the primary function of the corpus luteum in the female reproductive cycle?
A. The corpus luteum produces progesterone to prepare the uterus for implantation of a fertilized egg.
B. The corpus luteum produces estrogen to stimulate the growth of the follicle.
C. The corpus luteum produces testosterone to stimulate the growth of the sperm.
D. The corpus luteum produces oxytocin to stimulate milk production in the mammary glands.

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