POST UTME IMS U 2023 Biology | Objective

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Question 1 View Details
In a population of 1000 bacteria, 80% are susceptible to antibiotic treatment, 15% are resis\tant, and 5% are in a latent state. If 200 bacteria are treated with an antibiotic, what is the expected number of bacteria that will be killed?
Correct A. 80
B. 120
C. 160
D. 200

Correct Answer: A

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Question 2 View Details
A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 0.05 cm/s, what is the expected rate of proton entry into the cell?
Correct A. 0.025 cm/s
B. 0.05 cm/s
C. 0.075 cm/s
D. 0.1 cm/s

Correct Answer: A

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Question 3 View Details
A diagram of a plant cell is shown below. If the cell is placed in a solution with a pH of 7.5, what is the expected effect on the cell membrane?
A. The cell membrane will become more permeable.
Correct B. The cell membrane will become less permeable.
C. The cell membrane will remain unchanged.
D. The cell membrane will rupture.

Correct Answer: B

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Question 4 View Details
A diagram of a human eye is shown below. If the eye is placed in a solution with a pH of 6.5, what is the expected effect on the cornea?
A. The cornea will become more permeable.
Correct B. The cornea will become less permeable.
C. The cornea will remain unchanged.
D. The cornea will rupture.

Correct Answer: B

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Question 5 View Details
A diagram of a neuron is shown below. If the neuron is placed in a solution with a pH of 8.5, what is the expected effect on the axon?
A. The axon will become more permeable.
Correct B. The axon will become less permeable.
C. The axon will remain unchanged.
D. The axon will rupture.

Correct Answer: B

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Question 6 View Details
In the context of tissue classification, what is the primary function of the epithelial tissue?
A. To provide structural support to the body
Correct B. To facilitate the exchange of nutrients and waste products
C. To produce hormones and enzymes
D. To provide protection to the body

Correct Answer: B

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Question 7 View Details
A species of plant has a growth rate of 20% per year. If the initial population is 1000 plants, what will be the population after 5 years?
Correct A. 10000
B. 2000
C. 4000
D. 5000

Correct Answer: A

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Question 8 View Details
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal Cord

Correct Answer: A

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Question 9 View Details
A species of animal has a reproductive strategy of semelparity. What does this mean?
Correct A. The species reproduces only once in its lifetime
B. The species reproduces multiple times in its lifetime
C. The species has a high reproductive rate
D. The species has a low reproductive rate

Correct Answer: A

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Question 10 View Details
A diagram of a cell is shown below. What is the function of the mitochondria?
Correct A. To produce energy for the cell
B. To synthesize proteins
C. To store genetic information
D. To regulate cell growth

Correct Answer: A

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Question 11 View Details
In a population of 1000 individuals, 70% are heterozygous for a particular gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the offspring of a heterozygous individual and a homozygous recessive individual?
Correct A. Genotype: Hh, Phenotype: heterozygous
B. Genotype: HH, Phenotype: homozygous dominant
C. Genotype: hh, Phenotype: homozygous recessive
D. Genotype: Hh, Phenotype: homozygous dominant

Correct Answer: A

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Question 12 View Details
A 2.5-liter solution contains 1.8 liters of ethanol and 0.7 liters of water. What is the mole \fraction of ethanol in the solution?
Correct A. 0.8
B. 0.7
C. 0.9
D. 0.6

Correct Answer: A

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Question 13 View Details
A plant has a mutation in the gene that controls flower color. The wild-type allele is dominant and codes for red flowers, while the mu\tant allele is recessive and codes for white flowers. If a plant with red flowers is crossed with a plant with white flowers, what is the probability that the offspring will have red flowers?
A. 0.5
Correct B. 0.75
C. 0.25
D. 0.33

Correct Answer: B

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Question 14 View Details
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
Correct A. 7
B. 9
C. 11
D. 13

Correct Answer: A

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Question 15 View Details
A population of bacteria grows according to the equation N(t) = N0e^(kt), where N(t) is the number of bacteria at time t, N0 is the initial number of bacteria, e is the base of the natural \logarithm, and k is the growth rate. If N0 = 1000, k = 0.2, and t = 2, what is the number of bacteria?
A. 2000
Correct B. 4000
C. 6000
D. 8000

Correct Answer: B

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Question 16 View Details
In a tropical rainforest, the primary producers are mainly composed of which of the following?
A. Grasses and shrubs
Correct B. Trees and vines
C. Cacti and succulents
D. Mosses and ferns

Correct Answer: B

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Question 17 View Details
A patient is diagnosed with a bacterial infection caused by a Gram-positive bacterium. Which of the following antibiotics is most likely to be effective?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
Correct D. Vancomycin

Correct Answer: D

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Question 18 View Details
A diagram of the human eye is shown below. Which of the following structures is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
Correct D. Lens

Correct Answer: D

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Question 19 View Details
A genetic cross is performed between two pea plants, one with the genotype TT and the other with the genotype tt. What is the probability that the offspring will have the genotype Tt?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 20 View Details
A diagram of the human circulatory system is shown below. Which of the following structures is responsible for pumping blood from the heart to the lungs?
Correct A. Pulmonary artery
B. Pulmonary vein
C. Aorta
D. Pulmonary valve

Correct Answer: A

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Question 21 View Details
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
Correct D. No natural selection

Correct Answer: D

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Question 22 View Details
A plant with the genotype Rr, where R is the dominant allele for red flowers and r is the recessive allele for white flowers, is crossed with a plant with the genotype rr. What is the probability that the offspring will have red flowers?
A. 0.5
Correct B. 0.25
C. 0.75
D. 0.33

Correct Answer: B

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Question 23 View Details
The xylem is a type of vascular tissue in plants that is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is responsible for transporting sugars from the leaves to the roots
C. It is composed of living cells
Correct D. It is responsible for transporting water and minerals from the roots to the leaves

Correct Answer: D

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Question 24 View Details
The process of photosynthesis occurs in the chloroplasts of plant cells and involves the conversion of light energy into chemical energy. Which of the following is a byproduct of photosynthesis?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Glu\cose

Correct Answer: A

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Question 25 View Details
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key component of this theory?
Correct A. Survival of the fittest
B. Mutation
C. Gene flow
D. Genetic drift

Correct Answer: A

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