POST UTME WELLSPRING UNIVERSITY 2020 Biology | Objective

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Question 1
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial membrane, creating a proton gradient
C. To reduce NADH and FADH2 to NAD+ and FAD
D. To synthesize glu\cose from CO2 and H2O

Correct Answer: B

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Question 2
A 30-year-old woman presents with a 2-year history of amenorrhea. Her physical examination reveals a normal secondary sexual characteristic development. What is the most likely diagnosis?
A. Polycystic ovary syndrome (PCOS)
B. Premature ovarian failure (POF)
Correct C. Hypothalamic amenorrhea
D. Asherman's syndrome

Correct Answer: C

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Question 3
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
Correct D. Lens

Correct Answer: D

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Question 4
A 25-year-old man presents with a 5-year history of infertility. His semen analysis reveals a low sperm count. What is the most likely cause of his infertility?
Correct A. Varicocele
B. Epididymitis
C. Cryptorchidism
D. Hypogonadism

Correct Answer: A

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Question 5
A diagram of the human brain is shown below. Which part of the brain is responsible for regulating body temperature?
A. Cerebrum
B. Cerebellum
C. Brainstem
Correct D. Hypothalamus

Correct Answer: D

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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. 0.2
B. 0.4
C. 0.6
Correct D. 0.8

Correct Answer: D

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Question 7
A species of bird has a beak length of 5 cm. If the beak length is directly proportional to the square root of the bird's body weight, and the bird's body weight is 100 g, what is the beak length of a bird with a body weight of 400 g?
A. 10 cm
B. 15 cm
Correct C. 20 cm
D. 25 cm

Correct Answer: C

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Question 8
A plant has a photosynthetic rate of 10 μmol CO2 s^-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s^-1
Correct B. 40 μmol CO2 s^-1
C. 60 μmol CO2 s^-1
D. 80 μmol CO2 s^-1

Correct Answer: B

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Question 9
A population of bacteria has a growth rate of 0.05 h^-1. If the initial population size is 10^6 cells, what is the population size after 2 hours?
A. 10^5 cells
B. 10^6 cells
Correct C. 10^7 cells
D. 10^8 cells

Correct Answer: C

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Question 10
A species of fish has a body length of 10 cm. If the body length is directly proportional to the cube root of the fish's weight, and the fish's weight is 100 g, what is the body length of a fish with a weight of 400 g?
A. 15 cm
B. 20 cm
Correct C. 25 cm
D. 30 cm

Correct Answer: C

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Question 11
The diagram below shows the structure of a nerve cell. Which part of the cell is responsible for transmitting signals to other cells?
A. D\endrite
Correct B. Axon
C. Cell Body
D. Myelin Sheath

Correct Answer: B

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Question 12
A microorganism is isolated from a patient and cultured on a nutrient agar plate. The colony morpho\logy is shown below. What is the likely identity of the microorganism?
Correct A. Staphylococcus aureus
B. Escherichia coli
C. Pseudomonas aeruginosa
D. Klebsiella pneumoniae

Correct Answer: A

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Question 13
The diagram below shows the structure of a mitochondrion. Which part of the mitochondrion is responsible for generating ATP?
Correct A. Cristae
B. Matrix
C. Outer membrane
D. Inner membrane

Correct Answer: A

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Question 14
A patient presents with symptoms of diarrhea and abdominal cramps. A stool sample is collected and cultured on a selective medium. The growth of the microorganism is shown below. What is the likely identity of the microorganism?
A. Escherichia coli
B. Salmonella enterica
Correct C. Shigella dysenteriae
D. Campylobacter jejuni

Correct Answer: C

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Question 15
The diagram below shows the structure of a plant cell. Which part of the cell is responsible for photosynthesis?
A. Vacuole
Correct B. Chloroplast
C. Cell wall
D. Cytoplasm

Correct Answer: B

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

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Question 17
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'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1

Correct Answer: B

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Question 18
A neuron has a resting potential of -70 mV. If it is depolarized by 20 mV, what is the new membrane potential?
Correct A. -50
B. -60
C. -70
D. -80

Correct Answer: A

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Question 19
A solution of glu\cose is being transported across a cell membrane u\sing facilitated diffusion. If the concentration of glu\cose on the outside is 10 mM and the concentration on the inside is 5 mM, what is the direction of glu\cose transport?
Correct A. Into the cell
B. Out of the cell
C. No net transport
D. Dep\ends on the concentration gradient

Correct Answer: A

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Question 20
A plant has a photosynthetic rate of 10 μmol CO2/s. If the light intensity is increased by 50%, what is the new photosynthetic rate?
A. 5
B. 10
Correct C. 15
D. 20

Correct Answer: C

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Question 21
In a eukaryotic cell, the process of mitosis involves the separation of chromosomes into two daughter cells. Which of the following stages of mitosis is characterized by the condensation of chromosomes?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 22
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 mechanisms is responsible for this change?
A. Genetic drift
B. Gene flow
C. Mutation
Correct D. Selection

Correct Answer: D

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Question 23
The xylem in a plant is responsible for transporting water and minerals from the roots to the leaves. Which of the following types of cells is found in the xylem?
A. Parenchyma cells
B. Collenchyma cells
C. Sclerenchyma cells
Correct D. Tracheary elements

Correct Answer: D

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Question 24
The process of meiosis involves the reduction of the number of chromosomes in a cell from diploid to haploid. Which of the following stages of meiosis is characterized by the separation of homo\logous chromosomes?
A. Meiosis I
B. Meiosis II
C. Prophase I
Correct D. Anaphase I

Correct Answer: D

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Question 25
The process of photosynthesis involves the conversion of light energy into chemical energy. Which of the following reac\tants is converted into glu\cose during photosynthesis?
Correct A. Carbon dioxide
B. Water
C. Glu\cose
D. Oxygen

Correct Answer: A

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