POST UTME AAUA 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A patient is diagnosed with a bacterial infection that has developed resis\tance to multiple antibiotics. Which of the following is the most likely mechanism of resis\tance?
A. Efflux pumps
B. Enzymatic inactivation of antibiotics
C. Target modification
D. Biofilm formation
Question 2
A 1.0 L solution contains 0.5 M glu\cose. If 0.5 L of 0.1 M glu\cose is added to the solution, what is the new concentration of glu\cose?
A. \( 0.5 + 0.1 \) M
B. \( 0.5 - 0.1 \) M
C. \( 0.5 \times 0.1 \) M
D. ( 0.5 div 0.1 ) M
Question 3
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To produce NADH and FADH2
B. To generate a proton gradient across the mitochondrial membrane
C. To produce ATP through substrate-level phosphorylation
D. To reduce oxygen to water
Question 4
The diagram below shows a cross-section of a plant stem. Which of the following structures is responsible for the transport of water and minerals from the roots to the leaves?
A. The xylem tissue
B. The phloem tissue
C. The cortex
D. The epidermis
Question 5
In a population of 1000 individuals, the frequency of the recessive allele 'a' is 0.2. Assuming Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.16
B. 0.24
C. 0.36
D. 0.48
Question 6
A solution contains 2M glu\cose and 1M fructose. What is the total concentration of sugars in the solution?
A. 2M
B. 3M
C. 4M
D. 5M
Question 7
A cell has a volume of 10^-12 L and contains 2.5 x 10^6 molecules of a protein. If the protein has a molecular weight of 50,000 g/mol, what is the concentration of the protein in the cell?
A. \( 2.5 \times 10^6 \times \frac{50,000}{10^{-12}} \) M
B. \( 2.5 \times 10^6 \times \frac{50,000}{10^{-12}} \) g/L
C. \( 2.5 \times 10^6 \times \frac{50,000}{10^{-12}} \) g/mol
D. \( 2.5 \times 10^6 \times \frac{50,000}{10^{-12}} \) M/L
Question 8
A 1.5 L solution contains 0.3 M glu\cose. If 0.5 L of 0.1 M glu\cose is added to the solution, what is the new concentration of glu\cose?
A. \( 0.3 + 0.1 \) M
B. \( 0.3 - 0.1 \) M
C. \( 0.3 \times 0.1 \) M
D. ( 0.3 div 0.1 ) M
Question 9
In asexual reproduction, what is the term for the process by which a \single cell divides to produce two daughter cells?
A. Mitosis
B. Meiosis
C. Binary fission
D. Budding
Question 10
A patient with a history of recurring kidney stones is diagnosed with a genetic disorder affecting the reabsorption of calcium in the kidneys. Which of the following is the most likely disorder?
A. Cystinuria
B. X-linked hypophosphatemia
C. Familial hypocalciuric hypercalcemia
D. Primary hyperparathyroidism
Question 11
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
A. To focus light on the retina
B. To re\fract light entering the eye
C. To detect changes in light intensity
D. To regulate the amount of light entering the eye
Question 12
In the context of M\endelian genetics, what is the term for the phenomenon where a dominant allele masks the effect of a recessive allele?
A. Incomplete dominance
B. Codominance
C. Pseudodominance
D. Heterosis
Question 13
The process of meiosis results in the production of four haploid daughter cells from a diploid parent cell. Which of the following is a characteristic of the daughter cells produced during meiosis?
A. They have the same number of chromosomes as the parent cell
B. They have half the number of chromosomes as the parent cell
C. They have a mix of maternal and paternal chromosomes
D. They have a different number of chromosomes than the parent cell
Question 14
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. What is the saturation vapor pressure of the air?
A. 0.02 kPa
B. 0.03 kPa
C. 0.04 kPa
D. 0.05 kPa
Question 15
A certain species of bird has a unique mating system. The male bird builds a nest and attracts a female bird to lay her eggs. What is the mating system of this species?
A. Monogamy
B. Polygyny
C. Polyandry
D. Promiscuity

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