POST UTME AAUA 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant cell has a nucleus that contains 0.6 M DNA. If the volume of the nucleus is 25 mL, what is the total number of moles of DNA in the nucleus?
A. 0.015
B. 0.03
C. 0.045
D. 0.06
Question 2
A 20 L solution contains 0.2 M glu\cose. What is the total number of moles of glu\cose in the solution?
A. 4
B. 4.5
C. 5
D. 5.5
Question 3
The process by which plants convert light energy into chemical energy is known as
A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis
Question 4
A diagram of the human skeletal system is shown below. What is the primary function of the sternum?
A. Protection of internal organs
B. Attachment of muscles
C. Support of the spine
D. Facilitation of breathing
Question 5
A plant cell undergoes mitosis. Which of the following is a characteristic of the daughter cells?
A. Increased ploidy
B. Decreased ploidy
C. Same ploidy
D. No change in ploidy
Question 6
A diagram of the human circulatory system is shown below. What is the primary function of the pulmonary artery?
A. Oxygenation of blood
B. Deoxygenation of blood
C. Transport of nutrients
D. Removal of waste products
Question 7
A researcher is studying the effects of antibiotic resis\tance in a bacterial population. Which of the following is a likely consequence of the spread of antibiotic resis\tance?
A. Increased virulence
B. Decreased transmission
C. Reduced antibiotic efficacy
D. Enhanced immune response
Question 8
The genetic material that is responsible for the transmission of traits from one generation to the next is known as
A. DNA
B. RNA
C. Protein
D. Carbohydrate
Question 9
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Mutation
C. Gene flow
D. Differential reproduction
Question 10
The bacterium Escherichia coli (E. coli) is a Gram-negative, rod-shaped bacterium that is commonly found in the human gut. Which of the following is a characteristic of E. coli that contributes to its ability to cause disease?
A. Its ability to form biofilms
B. Its ability to produce virulence factors
C. Its ability to invade host cells
D. Its ability to resist antibiotics
Question 11
A plant cell has a mitochondrion that contains 0.3 M ATP. If the volume of the mitochondrion is 50 mL, what is the total number of moles of ATP in the mitochondrion?
A. 0.015
B. 0.03
C. 0.045
D. 0.06
Question 12
In the context of growth and regulation, what is the primary function of the hypothalamic-pituitary-adrenal axis?
A. To regulate the release of hormones by the adrenal glands
B. To stimulate the production of hormones by the pituitary gland
C. To inhibit the production of hormones by the hypothalamus
D. To regulate the secretion of hormones by the thyroid gland
Question 13
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 2% per hour, what is the population size after 5 hours?
A. 1000
B. 500
C. 2000
D. 3000
Question 14
The process of cellular respiration can be represented by the following equation: \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \). What is the overall equation for the production of ATP in cellular respiration?
A. ATP + H_2O + CO_2
B. ATP + O_2 + H_2O
C. ATP + C_6H_{12}O_6 + O_2
D. ATP + CO_2 + H_2O
Question 15
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 180
B. 200
C. 220
D. 240

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