POST UTME BABCOCK UNIVERSITY 2022 Biology | Objective

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Question 1 View Details
In a diploid cell, what is the total number of alleles for a \single gene locus if the genotype is AaBb?
A. 4
Correct B. 6
C. 8
D. 10

Correct Answer: B

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Question 2 View Details
A plant grows in a controlled environment with a cons\tant temperature of 25°C and a relative humidity of 60%. What is the expected rate of transpiration?
A. 0.05 g H2O/g dry matter/h
Correct B. 0.10 g H2O/g dry matter/h
C. 0.15 g H2O/g dry matter/h
D. 0.20 g H2O/g dry matter/h

Correct Answer: B

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Question 3 View Details
A 2.5 L solution of 0.1 M glu\cose is diluted to a total volume of 5 L. What is the new concentration of glu\cose?
A. 0.02 M
Correct B. 0.05 M
C. 0.10 M
D. 0.20 M

Correct Answer: B

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Question 4 View Details
A 50 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. What is the molarity of the resulting solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 5 View Details
A 10 mL sample of a 0.1 M solution of HCl is added to a 50 mL sample of a 0.2 M solution of NaOH. What is the resulting pH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 6 View Details
In a population of E. coli bacteria, the average generation time is 30 minutes. If the population is doubling every 10 minutes, what is the growth rate cons\tant (r) in units of 1/min?
A. 0.0693
Correct B. 0.693
C. 6.93
D. 69.3

Correct Answer: B

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Question 7 View Details
A 5% glu\cose solution is prepared by dissolving 5g of glu\cose in 95g of water. What is the molarity of the solution?
Correct A. 0.0309
B. 0.309
C. 3.09
D. 30.9

Correct Answer: A

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Question 8 View Details
A plant with the genotype AaBb is crossed with a plant with the genotype AaBb. What is the probability that the offspring will have the genotype AaBb?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 9 View Details
A 2.0 L flask contains 1.0 M HCl. If 0.5 L of 2.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.4
Correct B. 0.8
C. 1.2
D. 1.6

Correct Answer: B

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Question 10 View Details
A 10% solution of NaOH is prepared by dissolving 10g of NaOH in 90g of water. What is the molarity of the solution?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 11 View Details
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To produce xylem sap
Correct B. To store water and minerals
C. To facilitate the transport of xylem sap
D. To regulate the rate of xylem sap flow

Correct Answer: B

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Question 12 View Details
Which of the following is an example of a symbiotic relationship in the e\cosystem?
A. Predator-prey relationship
Correct B. Mutualism between clownfish and sea anemone
C. Competition between two species
D. Commensalism between two species

Correct Answer: B

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Question 13 View Details
What is the primary function of the mitochondria in a cell?
A. To produce ATP through photosynthesis
Correct B. To produce ATP through cellular respiration
C. To synthesize proteins
D. To store genetic information

Correct Answer: B

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Question 14 View Details
What is the term for the process by which plants convert light energy into chemical energy?
A. Respiration
Correct B. Photosynthesis
C. Decomposition
D. Fermentation

Correct Answer: B

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Question 15 View Details
What is the primary function of the root hairs in a plant?
Correct A. To absorb water and minerals from the soil
B. To produce xylem sap
C. To store water and minerals
D. To regulate the rate of xylem sap flow

Correct Answer: A

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Question 16 View Details
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual with the highest frequency in this population?
Correct A. Genotype: AA, Phenotype: Type A blood
B. Genotype: AO, Phenotype: Type A blood
C. Genotype: OO, Phenotype: Type O blood
D. Genotype: AO, Phenotype: Type B blood

Correct Answer: A

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Question 17 View Details
A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1.0

Correct Answer: A

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Question 18 View Details
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
Correct B. 7.0
C. 10.0
D. 14.0

Correct Answer: B

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Question 19 View Details
A 5.0 g sample of a subs\tance is dissolved in 100.0 mL of water. The resulting solution has a concentration of 0.5 M. What is the molar mass of the subs\tance?
A. 10.0 g/mol
B. 20.0 g/mol
Correct C. 50.0 g/mol
D. 100.0 g/mol

Correct Answer: C

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Question 20 View Details
A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. What is the probability that a randomly selected individual will have a height greater than 180 cm?
A. 0.1
Correct B. 0.2
C. 0.3
D. 0.4

Correct Answer: B

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Question 21 View Details
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'?
Correct A. 0.48
B. 0.36
C. 0.64
D. 0.52

Correct Answer: A

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Question 22 View Details
A 2-year-old child is brought to the hospital with symptoms of respiratory distress. The child's oxygen saturation is 88% on room air. Which of the following is the most likely diagnosis?
Correct A. Congenital diaphragmatic hernia
B. Pulmonary atresia
C. Tracheoesophageal fistula
D. Esophageal atresia

Correct Answer: A

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Question 23 View Details
A 35-year-old woman presents with primary amenorrhea. Her karyotype is 46,XX. Which of the following is the most likely diagnosis?
A. Turner syndrome
B. Androgen insensitivity syndrome
Correct C. Mayer-Roki\tansky-Küster-Hauser syndrome
D. Swyer syndrome

Correct Answer: C

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Question 24 View Details
A 50-year-old man presents with a 10-year history of hypertension. His blood pressure is 180/100 mmHg. Which of the following is the most likely diagnosis?
A. Primary aldosteronism
Correct B. Renal artery stenosis
C. Coarctation of the aorta
D. Pheochromocytoma

Correct Answer: B

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Question 25 View Details
A 25-year-old woman presents with a 2-year history of infertility. Her menstrual cycles are regular, and her karyotype is 46,XX. Which of the following is the most likely diagnosis?
Correct A. Polycystic ovary syndrome
B. Endometriosis
C. Tubal ligation
D. Premature ovarian failure

Correct Answer: A

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