POST UTME UNIBEN 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a closed system, the rate of respiration in a cell is influenced by the concentration of oxygen and the activity of the enzyme cytochrome c oxidase. Which of the following statements is correct regarding the relationship between oxygen concentration and the rate of respiration?
A. The rate of respiration increases with increa\sing oxygen concentration.
B. The rate of respiration decreases with increa\sing oxygen concentration.
C. The rate of respiration is unaffected by oxygen concentration.
D. The rate of respiration increases with decrea\sing oxygen concentration.
Question 2
The process of mitosis in a eukaryotic cell results in the production of daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the separation of chromosomes into two daughter cells?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 3
A 30-year-old woman has been experiencing symptoms of depression for the past 6 months. Her Hamilton Rating Scale for Depression (HRSD) score is 25. What is the most likely diagnosis?
A. Major depressive disorder
B. Bipolar disorder
C. Postpartum depression
D. Seasonal affective disorder
Question 4
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, what is the expected number of resis\tant bacteria?
A. 120
B. 150
C. 180
D. 200
Question 5
The human body's ability to regulate its internal environment is known as homeostasis. Which of the following systems plays a crucial role in maintaining homeostasis?
A. Nervous system
B. Endocrine system
C. Circulatory system
D. Respiratory system
Question 6
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Photosynthesis
B. Respiration
C. Storage of nutrients
D. Production of hormones
Question 7
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, calculate the frequency of the homozygous dominant genotype 'AA'.
A. 0.16
B. 0.24
C. 0.32
D. 0.36
Question 8
The process by which plants convert light energy into chemical energy is known as:
A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation
Question 9
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 homeostasis
C. Stimulation of the immune system
D. Modulation of the autonomic nervous system
Question 10
A diagram of the human excretory system is shown below. What is the primary function of the kidneys?
A. Regulation of pH
B. Maintenance of electrolyte balance
C. Production of urine
D. Regulation of blood pressure
Question 11
In the context of evolutionary theory, what is the term for the process by which a new species emerges from an existing one?
A. Speciation
B. Adaptation
C. Natural selection
D. Genetic drift
Question 12
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 13
The process of digestion in the human body involves the breakdown of food into smaller molecules. Which of the following enzymes plays a key role in the breakdown of proteins?
A. Amylase
B. Lipase
C. Tryp\sin
D. Lactase
Question 14
The hormone that stimulates the release of milk from the mammary glands of a lactating female is:
A. Oxytocin
B. Prolactin
C. Adrenaline
D. Insulin
Question 15
A patient with a kidney stone is experiencing severe pain in the flank region. Which of the following statements regarding the pathophysio\logy of kidney stones is correct?
A. Kidney stones are formed due to an excess of calcium in the urine.
B. Kidney stones are formed due to an excess of oxalate in the urine.
C. Kidney stones are formed due to an excess of uric acid in the urine.
D. Kidney stones are formed due to an excess of sodium in the urine.

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