POST UTME UNILAG 2019 Biology | Objective

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Question 1 View Details
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood glu\cose levels
Correct C. Response to stress and anxiety
D. Regulation of appetite and satiety

Correct Answer: C

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Question 2 View Details
A cell undergoing mitosis has a nuclear envelope that is
A. permeable to ions and small molecules
B. permeable to ions but impermeable to small molecules
Correct C. impermeable to ions and small molecules
D. permeable to small molecules but impermeable to ions

Correct Answer: C

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Question 3 View Details
In the context of respiration, what is the primary function of the mitochondria?
A. Production of ATP through glycolysis
B. Production of ATP through the citric acid cycle
Correct C. Production of ATP through oxidative phosphorylation
D. Production of ATP through substrate-level phosphorylation

Correct Answer: C

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Question 4 View Details
A plant root system has a high concentration of
A. xylem tissue
B. phloem tissue
C. cortex tissue
Correct D. \endodermis tissue

Correct Answer: D

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Question 5 View Details
A diagram of a plant cell is shown below. What is the function of the cell wall?
Correct A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To synthesize proteins
D. To store genetic information

Correct Answer: A

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Question 6 View Details
In the context of osmoregulation, what is the primary function of the kidneys in a hypertonic environment?
A. To regulate the concentration of ions in the blood
Correct B. To remove excess water from the body
C. To maintain the balance of electrolytes
D. To regulate the pH of the blood

Correct Answer: B

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Question 7 View Details
What is the process by which cells divide and produce daughter cells with the same number of chromosomes as the parent cell?
Correct A. Mitosis
B. Meiosis
C. Binary fission
D. Endoreduplication

Correct Answer: A

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Question 8 View Details
In the context of sense organs, what is the primary function of the retina in the human eye?
Correct A. To detect light and transmit signals to the brain
B. To focus light onto the lens
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye

Correct Answer: A

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Question 9 View Details
What is the process by which plants convert light energy into chemical energy?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation

Correct Answer: A

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Question 10 View Details
In the context of classification of living things, what is the primary function of the kingdom level?
Correct A. To group organisms based on their cell structure
B. To group organisms based on their body structure
C. To group organisms based on their metabolic processes
D. To group organisms based on their genetic makeup

Correct Answer: A

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Question 11 View Details
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Active transport
B. Passive diffusion
C. Osmosis
D. Filtration

Correct Answer: A

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Question 12 View Details
A cell undergoing mitosis has a total of 46 chromosomes. How many chromosomes will each daughter cell have after mitosis?
Correct A. 23
B. 46
C. 92
D. 138

Correct Answer: A

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Question 13 View Details
In the process of asexual reproduction, what is the primary mechanism by which the organism produces offspring?
A. Meiosis
B. Mitosis
Correct C. Binary fission
D. Budding

Correct Answer: C

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Question 14 View Details
A microorganism is isolated from a patient and identified as Staphylococcus aureus. What is the primary mechanism by which this bacterium causes disease?
Correct A. Toxins
B. Enzymes
C. Adhe\sins
D. Capsules

Correct Answer: A

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Question 15 View Details
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'A'?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 16 View Details
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the blood type. If 20% of the population are type A, 40% are type B, and 30% are type AB, what is the probability that a randomly selected individual is type O?
A. 0.05
Correct B. 0.10
C. 0.15
D. 0.20

Correct Answer: B

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Question 17 View Details
A plant with the genotype AaBb is crossed with a plant with the genotype AaBb. What is the probability that the offspring will have the genotype AaBb?
A. 0.25
Correct B. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 18 View Details
A species of bacteria has a generation time of 2 hours. If the population size is 10^6, what is the rate of increase per hour?
A. 0.001
Correct B. 0.01
C. 0.1
D. 1.0

Correct Answer: B

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Question 19 View Details
A plant with the genotype AaBb is crossed with a plant with the genotype AaBb. What is the probability that the offspring will have the genotype AaBb?
A. 0.25
Correct B. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 20 View Details
A species of bacteria has a generation time of 2 hours. If the population size is 10^6, what is the rate of increase per hour?
A. 0.001
Correct B. 0.01
C. 0.1
D. 1.0

Correct Answer: B

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Question 21 View Details
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
Correct B. 0.64
C. 0.72
D. 0.80

Correct Answer: B

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Question 22 View Details
A researcher is studying the effect of temperature on the rate of photosynthesis in a plant. If the rate of photosynthesis is measured in units of CO2 fixed per hour, what is the expected effect on the rate of photosynthesis if the temperature is increased from 20°C to 30°C?
A. decrease
Correct B. increase
C. no effect
D. variable

Correct Answer: B

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Question 23 View Details
A patient has a blood glu\cose level of 120 mg/dL. If the patient is administered a dose of insulin that increases the rate of glu\cose uptake by the cells by 20%, what is the expected change in blood glu\cose level after 2 hours?
A. 80 mg/dL
Correct B. 96 mg/dL
C. 112 mg/dL
D. 128 mg/dL

Correct Answer: B

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Question 24 View Details
A researcher is studying the effect of pH on the activity of the enzyme lactase. If the pH of the solution is increased from 4.5 to 5.5, what is the expected effect on the activity of the enzyme?
A. decrease
Correct B. increase
C. no effect
D. variable

Correct Answer: B

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Question 25 View Details
A patient has a blood pressure of 140/90 mmHg. If the patient is administered a medication that increases the diameter of the blood vessels by 15%, what is the expected change in blood pressure after 1 hour?
Correct A. 120/80 mmHg
B. 140/100 mmHg
C. 160/110 mmHg
D. 180/120 mmHg

Correct Answer: A

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