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POST UTME PAN-ATLANTIC UNIVERSITY 2023 Biology | Objective

Are you preparing for POST UTME PAN-ATLANTIC UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1

In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?

Correct A. To form the spindle fibers

B. To replicate the DNA

C. To condense the chromosomes

D. To form the nuclear envelope

Correct Answer: A

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Question 2

A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes is most likely to be affected by a change in pH?

A. Lactase

B. Amylase

Correct C. Pep\sin

D. Tryp\sin

Correct Answer: C

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Question 3

A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?

A. To store water

B. To synthesize proteins

C. To generate energy

Correct D. To store waste products

Correct Answer: D

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Question 4

A researcher is studying the effects of temperature on the growth of a microorganism. Which of the following temperatures is most likely to inhibit the growth of the microorganism?

A. 20°C

B. 30°C

C. 40°C

Correct D. 50°C

Correct Answer: D

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Question 5

A diagram of a human eye is shown below. What is the function of the structure labeled 'Y'?

A. To focus light

Correct B. To regulate the amount of light entering the eye

C. To detect light

D. To produce tears

Correct Answer: B

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Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. What is the probability that two randomly selected individuals will be homozygous recessive?

Correct A. 0.04

B. 0.16

C. 0.24

D. 0.36

Correct Answer: A

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Question 7

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'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 8

A solution of 0.1 M NaCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 9

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'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 10

A solution of 0.1 M NaCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 11

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. 0.2

B. 0.4

Correct C. 0.6

D. 0.8

Correct Answer: C

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Question 12

A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 10^-6 cm/s, what is the rate of diffusion of hydrogen ions into the cell?

A. 10^-6 cm/s

Correct B. 10^-5 cm/s

C. 10^-4 cm/s

D. 10^-3 cm/s

Correct Answer: B

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Question 13

A plant has a photosynthetic rate of 10 μmol CO2/s. If the stomatal density is 10^5 stomata/cm^2, what is the rate of transpiration?

A. 10^-5 mol H2O/s

B. 10^-4 mol H2O/s

Correct C. 10^-3 mol H2O/s

D. 10^-2 mol H2O/s

Correct Answer: C

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Question 14

A population of E. coli has a mean fitness of 0.8. If the population size is 10^6, what is the expected number of individuals with a fitness of 0.9?

A. 8000

Correct B. 10000

C. 12000

D. 14000

Correct Answer: B

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Question 15

A solution contains 10 mmol/L of glu\cose. If the concentration of glu\cose is reduced by 50% every 10 minutes, what is the concentration of glu\cose after 30 minutes?

Correct A. 0.5 mmol/L

B. 1 mmol/L

C. 2 mmol/L

D. 5 mmol/L

Correct Answer: A

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Question 16

In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?

Correct A. To provide structural support to the vessel

B. To facilitate the transport of water and minerals

C. To regulate the rate of transpiration

D. To store starch and other reserve materials

Correct Answer: A

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Question 17

A population of rabbits is growing \logistically according to the equation dP/dt = rP\( 1-P/K \). If the initial population size is 100 and the carrying capacity is 1000, what is the value of r?

A. 0.01

Correct B. 0.1

C. 0.5

D. 1.0

Correct Answer: B

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Question 18

In a study on the effects of light intensity on plant growth, the following data were collected:

Correct A. The rate of photosynthesis increases with increa\sing light intensity

B. The rate of photosynthesis decreases with increa\sing light intensity

C. The rate of photosynthesis remains cons\tant with increa\sing light intensity

D. The rate of photosynthesis is inversely proportional to light intensity

Correct Answer: A

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Question 19

A diagram of the human eye is shown below.

A. The cornea is responsible for focu\sing light onto the retina

Correct B. The lens is responsible for changing the focal length of the eye

C. The retina is responsible for converting light into electrical signals

D. The optic nerve is responsible for transmitting visual information to the brain

Correct Answer: B

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Question 20

A species of bird has a population size of 1000 and is growing at a rate of 10% per year. If the carrying capacity is 5000, what is the value of the intrinsic growth rate (r) in the \logistic growth equation?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 21

In the context of xylem transport, what is the primary function of the xylem parenchyma cells?

Correct A. To store water and minerals

B. To regulate water potential

C. To transport sugars and amino acids

D. To produce hormones

Correct Answer: A

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Question 22

Asexual reproduction in plants can occur through which of the following methods?

A. Budding

B. Fragmentation

C. Runners

Correct D. All of the above

Correct Answer: D

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Question 23

The nervous system in humans is responsible for which of the following functions?

A. Regulating body temperature

B. Controlling blood pressure

C. Coordinating voluntary movements

Correct D. All of the above

Correct Answer: D

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Question 24

The process of genetic drift can lead to which of the following outcomes?

A. Increased genetic variation

Correct B. Decreased genetic variation

C. No change in genetic variation

D. Dep\endence on population size

Correct Answer: B

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Question 25

The hormone insulin is produced by which of the following glands?

A. Pituitary gland

B. Thyroid gland

Correct C. Pancreas

D. Adrenal gland

Correct Answer: C

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