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POST UTME CHRISTOPHER UNIVERSITY 2024 Biology | Objective

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Question 1

In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation?

A. Genetic drift

B. Mutation

C. Gene flow

Correct D. Differential reproduction

Correct Answer: D

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Question 2

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

Correct A. Nucleus

B. Mitochondria

C. Chloroplast

D. Vacuole

Correct Answer: A

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Question 3

A patient is diagnosed with a bacterial infection. The bacteria are gram-positive and have a characteristic 'chain of beads' appearance under the microscope. What is the most likely cause of this infection?

A. Staphylococcus aureus

Correct B. Streptococcus pneumoniae

C. Escherichia coli

D. Pseudomonas aeruginosa

Correct Answer: B

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Question 4

A diagram of a human nervous system is shown below. Identify the structure labeled 'B'.

A. Cerebrum

Correct B. Cerebellum

C. Brainstem

D. Spinal cord

Correct Answer: B

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Question 5

A diagram of a cell division process is shown below. Identify the stage labeled 'C'.

A. Prophase

B. Metaphase

Correct C. Anaphase

D. Telophase

Correct Answer: C

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Question 6

In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected genotype and phenotype ratio of the offspring from a cross between two heterozygous individuals (Aa)?

Correct A. 0.36 AA : 0.48 Aa : 0.16 aa

B. 0.24 AA : 0.48 Aa : 0.28 aa

C. 0.48 AA : 0.36 Aa : 0.16 aa

D. 0.16 AA : 0.48 Aa : 0.36 aa

Correct Answer: A

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Question 7

A 2.5 cm long root hair cell has a diameter of 10 μm. If the cell membrane is 7.5 nm thick, what is the surface area of the cell membrane?

A. 0.00015 m^2

Correct B. 0.0003 m^2

C. 0.00045 m^2

D. 0.0006 m^2

Correct Answer: B

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Question 8

A 50 mL sample of a 0.1 M glu\cose solution is diluted to 100 mL. What is the new concentration of glu\cose?

Correct A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: A

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Question 9

A plant cell has a vacuole that is 10 μm in diameter. If the cell membrane is 7.5 nm thick, what is the surface area of the vacuole?

A. 0.00015 m^2

Correct B. 0.0003 m^2

C. 0.00045 m^2

D. 0.0006 m^2

Correct Answer: B

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Question 10

A 2.5 cm long root hair cell has a diameter of 10 μm. If the cell membrane is 7.5 nm thick, what is the volume of the cell?

A. 0.00015 m^3

Correct B. 0.0003 m^3

C. 0.00045 m^3

D. 0.0006 m^3

Correct Answer: B

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Question 11

In the context of evolutionary bio\logy, what is the primary mechanism driving the process of speciation?

A. Genetic drift

B. Mutation

C. Gene flow

Correct D. Natural selection

Correct Answer: D

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Question 12

A diagram of a plant cell is shown below. Identify the organelle responsible for photosynthesis.

A. Mitochondria

Correct B. Chloroplast

C. Nucleus

D. Vacuole

Correct Answer: B

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Question 13

A population of rabbits is growing according to the \logistic growth model. If the initial population size is 100 and the carrying capacity is 1000, 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 14

A diagram of a human eye is shown below. Identify the part responsible for adjusting the size of the pupil.

A. Cornea

Correct B. Iris

C. Retina

D. Lens

Correct Answer: B

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Question 15

A population of bacteria is growing according to the exponential growth model. If the initial population size is 100 and the growth rate is 0.05, 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 16

In a population of 1000 individuals, 20% are heterozygous for a particular gene, 40% are homozygous dominant, and 40% are homozygous recessive. What is the frequency of the recessive allele?

A. 0.2

B. 0.25

Correct C. 0.3

D. 0.35

Correct Answer: C

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Question 17

A plant with the genotype AaBbCcc is crossed with a plant with the genotype AabbDdEe. What is the probability that the offspring will have the genotype AaBbCc?

A. 0.25

Correct B. 0.5

C. 0.75

D. 1

Correct Answer: B

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Question 18

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 0.5 m/s

B. 1 m/s

Correct C. 1.5 m/s

D. 2 m/s

Correct Answer: C

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Question 19

A 5 L container is filled with a gas at a pressure of 2 atm and a temperature of 300 K. What is the volume of the gas at a pressure of 1 atm and a temperature of 400 K?

A. 10 L

B. 15 L

Correct C. 20 L

D. 25 L

Correct Answer: C

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Question 20

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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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 size is 1000, what is the expected number of homozygous recessive individuals?

Correct A. 180

B. 200

C. 220

D. 240

Correct Answer: A

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Question 22

A diagram of a plant's xylem and phloem is shown below. Which of the following is the primary function of the xylem?

Correct A. Transporting water and minerals from the roots to the leaves

B. Transporting sugars and other organic compounds from the leaves to the rest of the plant

C. Supporting the plant's structure

D. Regulating the plant's temperature

Correct Answer: A

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Question 23

A cell is placed in a solution with a pH of 5.5. If the cell membrane has a pH-dep\endent permeability, what will happen to the cell?

Correct A. The cell will swell and eventually burst

B. The cell will shrink and eventually die

C. The cell will remain unchanged

D. The cell will undergo mitosis

Correct Answer: A

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Question 24

A diagram of a human heart is shown below. Which of the following is the primary function of the atria?

A. Pumping blood from the lungs to the rest of the body

Correct B. Pumping blood from the rest of the body to the lungs

C. Regulating the heart's rhythm

D. Supporting the heart's structure

Correct Answer: B

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Question 25

A diagram of a cell's mitotic spindle is shown below. Which of the following is the primary function of the centrioles?

Correct A. Forming the mitotic spindle

B. Separating the chromosomes

C. Regulating the cell's cycle

D. Supporting the cell's structure

Correct Answer: A

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