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POST UTME VERITAS UNIVERSITY 2020 Biology | Objective

Are you preparing for POST UTME VERITAS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1

In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?

A. To conserve water by reabsorbing water from the filtrate

B. To excrete excess salt by producing a highly concentrated urine

C. To regulate electrolyte balance by adjusting the amount of ions in the urine

Correct D. To produce a highly concentrated urine by reabsorbing water from the filtrate

Correct Answer: D

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Question 2

What is the primary function of the Golgi apparatus in a cell?

A. To synthesize proteins from amino acids

Correct B. To modify and package proteins for transport

C. To synthesize lipids from fatty acids

D. To synthesize carbohydrates from glu\cose

Correct Answer: B

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Question 3

In the context of evolutionary theory, what is the primary mechanism driving the adaptation of a population to a changing environment?

Correct A. Natural selection

B. Genetic drift

C. Gene flow

D. Mutation

Correct Answer: A

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Question 4

What is the primary function of the pancreas in the regulation of blood glu\cose levels?

A. To produce insulin to lower blood glu\cose levels

B. To produce glucagon to raise blood glu\cose levels

Correct C. To produce both insulin and glucagon to regulate blood glu\cose levels

D. To produce neither insulin nor glucagon

Correct Answer: C

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Question 5

In the context of cell division, what is the primary function of the spindle fibers?

A. To separate the chromosomes during mitosis

B. To attach the chromosomes to the microtubules

Correct C. To move the chromosomes to the poles of the cell

D. To regulate the cell cycle

Correct Answer: C

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Question 6

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. 0.36

Correct B. 0.64

C. 0.72

D. 0.84

Correct Answer: B

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Question 7

A diagram of the human eye is shown below. Identify the part labeled 'A'.

Correct A. Cornea

B. Iris

C. Retina

D. Lens

Correct Answer: A

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Question 8

The graph below shows the relationship between the concentration of a substrate and the rate of enzyme activity.

Correct A. Michaelis-Menten kinetics

B. Enzyme inhibition

C. Competitive inhibition

D. Non-competitive inhibition

Correct Answer: A

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Question 9

A population of E. coli is grown in a nutrient-rich medium. The growth curve is shown below.

A. Logarithmic growth

Correct B. Exponential growth

C. Stationary phase

D. Death phase

Correct Answer: B

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Question 10

The following diagram shows the structure of a mitochondrion.

A. Mitochondrial matrix

Correct B. Mitochondrial inner membrane

C. Mitochondrial outer membrane

D. Mitochondrial cristae

Correct Answer: B

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Question 11

The process of natural selection can lead to the evolution of a population in which the average height of individuals increases over time. Which of the following is a possible explanation for this phenomenon?

A. Genetic drift

B. Mutation

Correct C. Genetic variation

D. Gene flow

Correct Answer: C

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Question 12

A species of bird has a beak shape that is well-suited for cracking open nuts. However, a sudden change in climate leads to a scarcity of nuts, and the population \begins to decline. What is the likely outcome for the population?

A. The population will adapt to the new climate and survive

Correct B. The population will go extinct

C. The population will remain stable

D. The population will increase

Correct Answer: B

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Question 13

A bio\logist is studying the classification of living organisms. Which of the following is a characteristic of the kingdom Animalia?

Correct A. Multicellularity

B. Cell wall

C. Chloroplasts

D. Symbiotic relationship

Correct Answer: A

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Question 14

A plant has a photosynthetic rate of 20 mg CO2/hour. If the light intensity is increased by 50%, what is the new photosynthetic rate?

A. 15 mg CO2/hour

B. 20 mg CO2/hour

Correct C. 25 mg CO2/hour

D. 30 mg CO2/hour

Correct Answer: C

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Question 15

A cell has a membrane potential of -70 mV. If a 10 mV depolarization occurs, what is the new membrane potential?

Correct A. -60 mV

B. -70 mV

C. -80 mV

D. -90 mV

Correct Answer: A

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Question 16

The process of genetic drift in a small population of finches on a remote island can lead to the fixation of a particular allele. However, if the population size increases, the effect of genetic drift decreases. Explain why this is the case.

A. Genetic drift is more pronounced in small populations due to the random sampling of alleles.

Correct B. The increased population size allows for more genetic variation, reducing the effect of genetic drift.

C. Genetic drift is influenced by the mutation rate, which increases with population size.

D. The fixation of a particular allele is more likely in small populations due to the Wahlund effect.

Correct Answer: B

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Question 17

A cell undergoing mitosis has a chromosome number of 46. If the cell divides into two daughter cells, what is the total number of chromosomes in the daughter cells?

Correct A. 92

B. 46

C. 23

D. 92

Correct Answer: A

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Question 18

A diagram of the human eye is shown below. Identify the part labeled 'A'.

Correct A. Cornea

B. Iris

C. Lens

D. Retina

Correct Answer: A

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Question 19

A population of rabbits is growing at a rate of 20% per year. If the initial population size is 100, what will be the population size after 5 years?

Correct A. 1610

B. 1000

C. 400

D. 1600

Correct Answer: A

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Question 20

A DNA molecule has the following sequence: ATCGATCG. What is the complementary DNA sequence?

Correct A. TAGCTAGC

B. ATCGATCG

C. TCGATCGA

D. GCTAGCTA

Correct Answer: A

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Question 21

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 22

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?

Correct A. 1/2

B. 1/3

C. 2/3

D. 3/4

Correct Answer: A

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Question 23

A cell is placed in a solution with a pH of 7.5. What is the concentration of hydrogen ions in this solution?

Correct A. 1.26 \times 10^{-8} M

B. 2.51 \times 10^{-8} M

C. 5.01 \times 10^{-8} M

D. 1.01 \times 10^{-7} M

Correct Answer: A

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Question 24

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

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Question 25

A diagram of a human eye is shown below. Identify the part labeled 'B'.

A. Cornea

Correct B. Iris

C. Lens

D. Retina

Correct Answer: B

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