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POST UTME LEAD CITY UNIVERSITY 2024 Biology | Objective

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Question 1

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 2

A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell has a permeability coefficient of 1.5 x 10^-6 cm/s and a surface area of 2.5 x 10^-4 cm^2, what is the rate of glu\cose diffusion into the cell?

A. 1.875 x 10^-8 mol/s

Correct B. 3.75 x 10^-8 mol/s

C. 6.25 x 10^-8 mol/s

D. 9.375 x 10^-8 mol/s

Correct Answer: B

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Question 3

A plant has a root system with a total surface area of 10 cm^2. If the root system is exposed to a solution with a concentration of 0.5 M KCl, what is the rate of K+ uptake by the plant?

A. 5 x 10^-6 mol/s

B. 1 x 10^-5 mol/s

Correct C. 1.5 x 10^-5 mol/s

D. 2 x 10^-5 mol/s

Correct Answer: C

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Question 4

A neuron has a resting membrane potential of -70 mV. If the neuron is stimulated with a 1 ms pulse of 10 mV, what is the resulting action potential?

A. -50 mV

Correct B. -60 mV

C. -70 mV

D. -80 mV

Correct Answer: B

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Question 5

A hormone is released from the hypothalamus and binds to receptors in the pituitary gland. If the hormone has a dissociation cons\tant (Kd) of 10^-6 M and a concentration of 10^-5 M, what is the \fraction of receptors bound to the hormone?

A. 0.5

Correct B. 0.6

C. 0.7

D. 0.8

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. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 7

A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what is the direction of net glu\cose movement?

Correct A. Into the cell

B. Out of the cell

C. No net movement

D. Dep\ends on the cell type

Correct Answer: A

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Question 8

A bacterium is placed in a medium with a pH of 7.0. If the bacterium has a pH optimum of 6.5, what is the likely outcome?

A. The bacterium will grow rapidly

Correct B. The bacterium will grow slowly

C. The bacterium will not grow

D. The bacterium will die

Correct Answer: B

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Question 9

A plant has a genotype of 'Rr' for the flower color gene. If the plant is self-pollinated, what is the probability that the offspring will have the genotype 'RR'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 10

A population of rabbits has a birth rate of 0.05 and a death rate of 0.01. If the population is initially 100, what is the population size after 5 years?

A. 120

B. 150

Correct C. 180

D. 200

Correct Answer: C

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Question 11

In a population of E. coli, the frequency of the gene for resis\tance to ampicillin is 0.2. If the population size is 10^6, how many bacteria are resis\tant to ampicillin?

Correct A. 2000

B. 20000

C. 200000

D. 2000000

Correct Answer: A

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Question 12

A species of yeast undergoes asexual reproduction by budding. If the initial population size is 1000 cells, and the population doubles every 2 hours, how many cells will be present after 6 hours?

A. 16000

B. 32000

Correct C. 64000

D. 128000

Correct Answer: C

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Question 13

A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours light and 12 hours darkness. If the plant is in the light phase, and the rate of photosynthesis is 10 μmol CO2 s^-1, what is the rate of respiration?

A. 5 μmol CO2 s^-1

Correct B. 10 μmol CO2 s^-1

C. 15 μmol CO2 s^-1

D. 20 μmol CO2 s^-1

Correct Answer: B

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Question 14

A genetic cross is performed between two true-breeding lines of Drosophila melanogaster. One line is homozygous dominant for the gene controlling eye color (B), and the other line is homozygous recessive (b). If the cross produces 100 offspring, and 60 have the dominant eye color, what is the genotype of the parents?

A. BB x bb

B. Bb x Bb

Correct C. Bb x bb

D. bb x bb

Correct Answer: C

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Question 15

A kidney stone is composed of calcium oxalate crystals. If the stone has a volume of 1 cm^3, and the density of the stone is 2.5 g cm^-3, what is the mass of the stone?

Correct A. 2.5 g

B. 5 g

C. 10 g

D. 20 g

Correct Answer: A

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Question 16

In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light energy in the blue-violet region of the visible spectrum?

A. Chlorophyll a

B. Chlorophyll b

C. Carotenoids

Correct D. Phycobiliproteins

Correct Answer: D

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Question 17

A cell undergoing mitosis has a total of 46 chromosomes. If this cell is a somatic cell, what is the ploidy level of the organism it belongs to?

Correct A. Diploid

B. Triploid

C. Tetraploid

D. Haploid

Correct Answer: A

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Question 18

A population of a certain species is growing according to the \logistic growth model. If the carrying capacity of the environment is 1000 individuals and the initial population size is 100 individuals, what is the population size after 5 generations?

A. 500

B. 750

Correct C. 900

D. 950

Correct Answer: C

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Question 19

A researcher is studying the effect of pH on the activity of a certain enzyme. If the enzyme is most active at a pH of 7.5 and the researcher wants to determine the pH at which the enzyme is 50% active, what would be the pH value?

A. 6.5

Correct B. 7

C. 7.5

D. 8

Correct Answer: B

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Question 20

A diagram of a plant cell is shown below. Which of the following organelles is responsible for the synthesis of proteins?

A. Nucleus

B. Mitochondria

Correct C. Ribosome

D. Endoplasmic reticulum

Correct Answer: C

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Question 21

In a population of 1000 individuals, 60% are heterozygous for the gene controlling the production of the enzyme lactase. If 20% of the population is homozygous recessive for this gene, what is the frequency of the recessive allele?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 22

A cell is placed in a solution containing 0.1 M glu\cose and 0.2 M fructose. If the cell membrane is permeable to both sugars, what is the concentration of glu\cose outside the cell after 10 minutes?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 23

A plant grows in a pot with a mixture of 50% sand and 50% clay. If the plant requires 20% more water than the sand alone, what is the percentage of clay in the mixture?

A. 20%

Correct B. 30%

C. 40%

D. 50%

Correct Answer: B

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Question 24

A nerve impulse travels down a neuron at a speed of 1 m/s. If the neuron is 10 cm long, how long does it take for the impulse to reach the \end of the neuron?

A. 1 s

Correct B. 2 s

C. 3 s

D. 4 s

Correct Answer: B

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Question 25

A population of 1000 individuals has a birth rate of 5% and a death rate of 2%. What is the rate of population growth?

A. 3%

B. 5%

Correct C. 7%

D. 10%

Correct Answer: C

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