POST UTME AL-HIKMAH UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A cell has a membrane potential of -70 mV. If the cell is stimulated to fire an action potential, what is the maximum rate of change of the membrane potential?
A. 10 mV/ms
B. 20 mV/ms
C. 30 mV/ms
D. 40 mV/ms
Question 2
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To provide structural support to the plant
D. To regulate the plant's water balance
Question 3
A population of rabbits is growing at a rate of 20% per year. If the population is currently 1000 rabbits, what will be the population after 5 years?
A. 1630
B. 2000
C. 2500
D. 3000
Question 4
A diagram of a plant's transport system is shown below. What is the function of the part labeled 'C'?
A. Transporting water and minerals from the roots to the leaves
B. Transporting sugars and other organic compounds from the leaves to the rest of the plant
C. Regulating the rate of transpiration
D. Producing chlorophyll
Question 5
A population of rabbits is growing \logistically with a carrying capacity of 1000 individuals. If the initial population size is 100 individuals, what is the population size after 5 years?
A. 500
B. 750
C. 900
D. 1000
Question 6
In the context of excretion, what is the primary function of the kidneys?
A. To filter waste products from the blood
B. To regulate the amount of water in the body
C. To produce hormones that control growth and development
D. To produce digestive enzymes
Question 7
The diagram below shows the structure of a microorganism. Which of the following is a characteristic of this microorganism?
A. It has a cell wall
B. It has a cell membrane
C. It has a nucleus
D. It has a mitochondria
Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis
Question 9
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following is a characteristic of the enzyme that would be affected by changes in pH?
A. Optimum temperature
B. pH optimum
C. Substrate specificity
D. Catalytic rate
Question 10
The process of osmoregulation in animals involves the regulation of the concentration of what in the body?
A. Water
B. Sodium
C. Potassium
D. Calcium
Question 11
In the context of excretion, what is the primary function of the kidneys in the human body?
A. To regulate the body's pH levels
B. To produce urine and remove waste products from the body
C. To regulate the body's water balance
D. To produce hormones that regulate various bodily functions
Question 12
A diagram of a plant cell is shown below. Identify the structure labeled 'A'.
A. Mitochondria
B. Nucleus
C. Cell wall
D. Plastid
Question 13
In a plant, the xylem is responsible for transporting water and minerals from the roots to the leaves. What is the function of the phloem?
A. Transporting water and minerals from the roots to the leaves
B. Transporting sugars and other organic compounds from the leaves to the rest of the plant
C. Regulating the rate of transpiration
D. Producing chlorophyll
Question 14
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. 0.48
D. 0.72
Question 15
A diagram of a DNA molecule is shown below. What is the function of the structure labeled 'B'?
A. Replication
B. Transcription
C. Translation
D. Mutation

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