Practice Post UTME UNIPORT biology 2021 Past Questions

Question 1 View Details

In a photosynthetic pathway, which of the following is the primary acceptor of electrons in the light-dep\endent reactions?

Correct A. P680

B. P700

C. Plastocyanin

D. Ferredoxin

Correct Answer: A

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Question 2 View Details

A cell undergoing mitosis has a chromosome number of 46. What is the ploidy level of this cell?

Correct A. Diploid

B. Haploid

C. Triploid

D. Tetraploid

Correct Answer: A

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Question 3 View Details

In the process of cellular respiration, which of the following is the primary source of energy for the cell?

Correct A. ATP

B. NADH

C. FADH2

D. Pyruvate

Correct Answer: A

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Question 4 View Details

A plant has a leaf with a stomatal density of 100 stomata per square millimeter. What is the stomatal frequency of this leaf?

Correct A. 100 stomata/mm2

B. 10 stomata/mm2

C. 1 stomata/mm2

D. 0.1 stomata/mm2

Correct Answer: A

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Question 5 View Details

In a population of 1000 individuals, 70% are heterozygous for a particular gene. What is the frequency of the recessive allele in this population?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 6 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 expected frequency of the recessive allele in this population?

A. 0.05

Correct B. 0.1

C. 0.15

D. 0.2

Correct Answer: B

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Question 7 View Details

A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?

Correct A. 1/4

B. 1/2

C. 3/4

D. 1

Correct Answer: A

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Question 8 View Details

A researcher is studying the effect of a new pesticide on a population of insects. The pesticide is 90% effective in killing the insects. If 1000 insects are exposed to the pesticide, how many are expected to survive?

Correct A. 10

B. 100

C. 1000

D. 900

Correct Answer: A

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Question 9 View Details

A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?

Correct A. 1/4

B. 1/2

C. 3/4

D. 1

Correct Answer: A

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Question 10 View Details

A researcher is studying the effect of a new pesticide on a population of insects. The pesticide is 90% effective in killing the insects. If 1000 insects are exposed to the pesticide, how many are expected to survive?

Correct A. 10

B. 100

C. 1000

D. 900

Correct Answer: A

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Question 11 View Details

In a photosynthetic pathway, light-dep\endent reactions occur in the thylakoid membranes of the chloroplast, while light-indep\endent reactions take place in the stroma. What is the primary function of the stroma in the light-indep\endent reactions?

Correct A. Fixation of CO2

B. Reduction of NADP+ to NADPH

C. Synthesis of ATP

D. Regeneration of RuBP

Correct Answer: A

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Question 12 View Details

A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. What is the expected genotype and phenotype of an individual with the genotype 'Aa'?

Correct A. Genotype: Aa, Phenotype: Wild type

B. Genotype: aa, Phenotype: Wild type

C. Genotype: Aa, Phenotype: Recessive

D. Genotype: aa, Phenotype: Recessive

Correct Answer: A

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Question 13 View Details

In the human eye, light enters through the cornea and is focused by the lens onto the retina. What is the primary function of the retina?

Correct A. To detect light and convert it into electrical signals

B. To focus light onto the retina

C. To regulate the amount of light entering the eye

D. To produce tears to lubricate the eye

Correct Answer: A

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Question 14 View Details

A species of plant has a genetic variation in its seed size. The frequency of the large seed allele is 0.6, and the frequency of the small seed allele is 0.4. What is the expected frequency of the genotype 'LL'?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.84

Correct Answer: A

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Question 15 View Details

In the human circulatory system, blood is pumped from the heart through the arteries and into the capillaries. What is the primary function of the capillaries?

Correct A. To transport oxygen and nutrients to the cells

B. To remove waste products from the cells

C. To regulate blood pressure

D. To produce red blood cells

Correct Answer: A

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Question 16 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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 17 View Details

A 2.5-g sample of a compound containing only carbon and hydrogen is burned in oxygen to produce 3.5 L of CO2 at 25°C and 1 atm. What is the empirical formula of the compound?

Correct A. CH4

B. C2H6

C. C3H8

D. C4H10

Correct Answer: A

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Question 18 View Details

A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what will be the concentration of sucrose in the cytoplasm after 30 minutes?

A. 0.2 M

Correct B. 0.3 M

C. 0.4 M

D. 0.5 M

Correct Answer: B

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Question 19 View Details

A geneticist wants to study the inheri\tance of a trait in a population of mice. She collects data on the genotype and phenotype of 100 mice and finds that 60% of the mice are homozygous dominant, 20% are homozygous recessive, and 20% are heterozygous. What is the probability that a randomly selected mouse will be homozygous recessive?

A. 0.2

B. 0.3

C. 0.4

Correct D. 0.6

Correct Answer: D

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Question 20 View Details

A 5.0-g sample of a compound containing only carbon and hydrogen is burned in oxygen to produce 2.5 L of CO2 at 25°C and 1 atm. What is the molar mass of the compound?

A. 12 g/mol

B. 24 g/mol

Correct C. 36 g/mol

D. 48 g/mol

Correct Answer: C

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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. 0.16

B. 0.36

C. 0.64

D. 0.84

Correct Answer: A

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Question 22 View Details

A 25-year-old woman presents with symptoms of anemia. Her hemoglobin level is 8g/dL. Which of the following is the most likely cause of her anemia?

Correct A. Iron deficiency anemia

B. Vitamin B12 deficiency anemia

C. Folate deficiency anemia

D. Sickle cell anemia

Correct Answer: A

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Question 23 View Details

A 35-year-old man is diagnosed with type 2 diabetes mellitus. His fasting blood glu\cose level is 250mg/dL. Which of the following is the most appropriate treatment for his condition?

Correct A. Metformin

B. Sulfonylureas

C. Insulin therapy

D. Pioglitazone

Correct Answer: A

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Question 24 View Details

A 28-year-old woman presents with symptoms of depression. She has a history of trauma and has been experiencing flashbacks. Which of the following is the most appropriate treatment for her condition?

Correct A. Selective serotonin reuptake inhibitors (SSRIs)

B. Serotonin-norepinephrine reuptake inhibitors (SNRIs)

C. Tricyclic antidepressants (TCAs)

D. Monoamine oxidase inhibitors (MAOIs)

Correct Answer: A

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Question 25 View Details

A 40-year-old man is diagnosed with hypertension. His blood pressure is 180/100mmHg. Which of the following is the most appropriate treatment for his condition?

Correct A. Li\sinopril

B. Amlodipine

C. Metoprolol

D. Hydrochlorothiazide

Correct Answer: A

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