POST UTME IMS U 2017 Biology | Objective

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Question 1
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the Δπηπερης (Δπη) complex. Which of the following is a key component of the Δπη complex?
A. Histone H3
B. Histone H4
C. Centromere protein CENP-A
D. Topoisomerase II
Question 2
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 dominant genotype 'AA'?
A. 0.36
B. 0.64
C. 0.16
D. 0.04
Question 3
A diagram of a DNA molecule is shown below. Which of the following is the primary function of the promoter region?
A. To initiate transcription
B. To regulate gene expression
C. To bind RNA polymerase
D. To form a hairpin loop
Question 4
A bio\logist is studying the life cycle of a particular species of plant. Which of the following stages is responsible for the production of seeds?
A. Germination
B. Seedling
C. Maturation
D. Pollination
Question 5
The human eye has a unique structure that allows it to detect light and transmit visual signals to the brain. Which of the following parts of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 6
A diagram of a human eye is shown below. Which of the following is the primary function of the retina?
A. To focus light on the lens
B. To detect light and convert it into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears
Question 7
A 2.5 L flask contains a mixture of N2 and O2 gases at 25°C and 1 atm. If 1.5 L of the mixture is removed and replaced with pure O2, what is the partial pressure of O2 in the flask?
A. 0.5 atm
B. 0.75 atm
C. 1.0 atm
D. 1.25 atm
Question 8
A population of rabbits is growing according to the \logistic equation \(dN/dt = rN\( 1-N/K)\ \). If the carrying capacity K is 1000 and the growth rate r is 0.1, what is the equilibrium population?
A. 250
B. 500
C. 750
D. 1000
Question 9
A 10% solution of glu\cose is diluted to 5% by adding water. What is the ratio of the initial volume to the final volume?
A. 1:2
B. 1:3
C. 2:3
D. 3:4
Question 10
In the context of eco\logy, what is the primary function of a keystone species?
A. To maintain the balance of the e\cosystem
B. To regulate the population of other species
C. To provide a source of food for other species
D. To create a habitat for other species
Question 11
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 dominant genotype 'AA'?
A. 0.64
B. 0.36
C. 0.48
D. 0.16
Question 12
A diagram of the human eye is shown below. What is the primary function of the retina?
A. To detect changes in light intensity
B. To focus light on the retina
C. To regulate the amount of light entering the eye
D. To maintain the shape of the eyeball
Question 13
The human body has a unique system that allows it to maintain homeostasis and regulate its internal environment. Which of the following systems is responsible for regulating body temperature?
A. Nervous System
B. Circulatory System
C. Respiratory System
D. Sweat Glands
Question 14
A researcher is studying the effects of a new pesticide on a population of Drosophila melanogaster. The pesticide is applied at a concentration of 10±0⁴ M. Which of the following is the most likely effect of this pesticide on the population?
A. Increased population size
B. Decreased population size
C. No effect on population size
D. Increased mutation rate
Question 15
A population of bacteria is growing exponentially according to the equation \(N(t) = N_0e^{kt}\). If the initial population is 1000 and the population doubles every 2 hours, what is the growth rate k?
A. 0.3466
B. 0.6931
C. 1.3863
D. 2.7726

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