POST UTME ELIZADE UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected genotype and phenotype ratio in the offspring of a cross between two heterozygous parents (Aa)?
A. 0.36 AA : 0.48 Aa : 0.16 aa
B. 0.48 AA : 0.36 Aa : 0.16 aa
C. 0.16 AA : 0.48 Aa : 0.36 aa
D. 0.48 AA : 0.16 Aa : 0.36 aa
Question 2
The hormone insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels. What is the primary effect of insulin on glu\cose metabolism?
A. To increase glu\cose levels in the blood
B. To decrease glu\cose levels in the blood
C. To increase glu\cose uptake by cells
D. To decrease glu\cose uptake by cells
Question 3
A 50 g sample of a subs\tance is found to have a mass of 25 g after being dried in an oven at 105°C for 2 hours. What is the percentage of water in the subs\tance?
A. 20%
B. 30%
C. 40%
D. 50%
Question 4
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. However, this principle assumes a random mating system. What would be the effect of a non-random mating system on the Hardy-Weinberg principle?
A. The frequency of alleles would increase
B. The frequency of alleles would decrease
C. The frequency of alleles would remain cons\tant
D. The frequency of alleles would become fixed
Question 5
A population of bacteria is growing exponentially. If the initial population is 1000 and the population doubles every 2 hours, what will be the population after 6 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 6
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this bacterium?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
D. Vancomycin
Question 7
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 8
In a tropical rainforest, the energy flow from producers to primary consumers is typically characterized by a high rate of energy transfer. However, this energy is often lost as heat due to the high metabolic rates of these organisms. Which of the following best describes the type of e\cosystem where this occurs?
A. Tropical rainforest
B. Grassland
C. Desert
D. Temperate forest
Question 9
In asexual reproduction, offspring are produced without the involvement of gametes. What is the primary advantage of asexual reproduction?
A. Increased genetic variation
B. Reduced genetic variation
C. Increased population growth rate
D. Decreased population growth rate
Question 10
In the xylem, water and minerals are transported from the roots to the leaves through the process of transpiration. What is the primary mechanism by which water is absorbed by the roots?
A. Osmosis
B. Active transport
C. Passive transport
D. Diffusion
Question 11
The process of mitosis is a type of cell division that results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is characterized by the condensation of chromatin into visible chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 12
A 2.5 L solution of 0.1 M NaCl is diluted to 5 L. What is the concentration of NaCl in the final solution?
A. 0.02 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 13
In the process of osmoregulation, the kidneys play a crucial role in maintaining the balance of electrolytes and water in the body. Which of the following is a function of the kidneys in this process?
A. Regulation of blood pressure
B. Maintenance of electrolyte balance
C. Removal of waste products
D. Production of hormones
Question 14
What is the primary function of the xylem in a plant?
A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and amino acids from the leaves to the roots
C. Support and structure for the plant
D. Storage of food and water
Question 15
In the process of cellular respiration, what is the net result of the citric acid cycle?
A. Production of 1 ATP and 1 NADH
B. Production of 2 ATP and 1 FADH2
C. Production of 3 ATP and 1 NADH
D. Production of 1 ATP and 1 FADH2

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