POST UTME UNN 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of osmoregulation in animals involves the regulation of water and electrolyte balance. Which of the following is a key mechanism involved in osmoregulation in the kidneys?
A. Reabsorption of glu\cose and amino acids
B. Excretion of excess sodium ions
C. Production of antidiuretic hormone (ADH)
D. Regulation of blood pressure through the renin-angioten\sin-aldosterone system
Question 2
A patient with a blood pH of 7.2 is administered a solution of 0.9% NaCl. If the patient's blood volume is 5 L, and the solution is administered at a rate of 100 mL/min, what is the expected change in blood pH after 30 minutes?
A. 7.1
B. 7.3
C. 7.4
D. 7.5
Question 3
A geneticist is studying the inheri\tance of a particular trait in a population of mice. The trait is controlled by a \single gene with two alleles: A and a. The following Punnett square shows the genotypes and phenotypes of the offspring:
A. AA
B. Aa
C. aa
D. None of the above
Question 4
In a population of E. coli, the average generation time is 30 minutes. If the population size is 10^6 cells, and the growth rate is 0.5 h^-1, what is the expected population size after 2 hours?
A. 5.0 x 10^6
B. 1.0 x 10^7
C. 2.5 x 10^7
D. 1.0 x 10^8
Question 5
A 20-kg object is attached to a horizontal spring with a force cons\tant of 100 N/m. If the object is displaced by 0.2 m from its equilibrium position, what is the magnitude of the restoring force?
A. 20 N
B. 40 N
C. 80 N
D. 100 N
Question 6
A 10% solution of glu\cose is diluted to 5% by adding water. What is the ratio of the initial volume to the final volume?
A. 1:2
B. 1:3
C. 2:3
D. 3:4
Question 7
In the process of photosynthesis, what is the primary reac\tant that is converted into glu\cose?
A. Carbon dioxide
B. Water
C. Glu\cose
D. Oxygen
Question 8
A plant's xylem is responsible for transporting what type of subs\tance?
A. Water and minerals from the roots to the leaves
B. Sugars and amino acids from the leaves to the roots
C. Hormones and other signaling molecules throughout the plant
D. Waste products and excess ions from the leaves to the roots
Question 9
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. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 10
In the classification of living things, what is the primary characteristic that distinguishes between prokaryotic and eukaryotic cells?
A. Presence of a nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Size of the cell
Question 11
A patient presents with symptoms of fever, headache, and body aches. A blood smear reveals the presence of ring-shaped parasites. What is the most likely diagnosis?
A. Malaria
B. Typhoid fever
C. Lyme disease
D. Leptospirosis
Question 12
A 10.0 mL sample of a solution containing 0.5 M NaCl is diluted to 50.0 mL. What is the concentration of the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.5 M
Question 13
In a forest e\cosystem, the presence of a keystone species can have a cascading effect on the entire food chain. Which of the following species is most likely to be a keystone species?
A. Owl
B. Deer
C. Beaver
D. Wolf
Question 14
In the process of mitosis, what is the primary function of the anaphase stage?
A. To separate the sister chromatids and move them to opposite poles of the cell
B. To condense the chromosomes and prepare them for separation
C. To decondense the chromosomes and prepare them for cell division
D. To repair any damaged chromosomes before cell division
Question 15
A 20.0 g sample of a compound containing only carbon and oxygen is heated in a crucible. The mass of the residue is 4.0 g. What is the empirical formula of the compound?
A. CO
B. C2O
C. C3O2
D. C4O4

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