POST UTME ACHIEVERS UNIVERSITY 2019 Biology | Objective

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Question 1
In the context of cell division, what is the primary function of the spindle fibers during anaphase?
A. To separate the sister chromatids
B. To align the chromosomes at the metaphase plate
Correct C. To move the chromosomes to the poles of the cell
D. To condense the chromosomes

Correct Answer: C

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Question 2
What is the primary mechanism by which the xylem transports water and minerals from the roots to the leaves of a plant?
Correct A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

Correct Answer: A

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Question 3
In the context of eco\logy, what is the term for the process by which dead and decaying organisms are converted into nutrient-rich soil?
Correct A. Decomposition
B. Nutrient cycling
C. Primary production
D. Secondary succession

Correct Answer: A

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Question 4
What is the primary function of the mitochondria in a cell?
Correct A. To generate energy for the cell
B. To synthesize proteins
C. To store genetic information
D. To regulate cell growth

Correct Answer: A

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Question 5
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Heritability
Correct B. Inheri\tance
C. Mutation
D. Genetic drift

Correct Answer: B

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Question 6
The process of osmoregulation in plants involves the movement of water across the plasma membrane. Which of the following is a key component of the aquaporin protein that facilitates this process?
Correct A. Asparagine
B. Glutamine
C. Histidine
D. Aspartate

Correct Answer: A

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Question 7
In the context of eco\logical succession, which of the following stages is characterized by the dominance of grasses and wildflowers?
A. Pioneer Stage
B. Succession Stage
C. Climax Stage
Correct D. Intermediate Stage

Correct Answer: D

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Question 8
The Hardy-Weinberg principle states that a population will remain in a state of genetic equilibrium if certain conditions are met. Which of the following conditions is NOT necessary for genetic equilibrium?
A. Random mating
B. No mutation
C. No gene flow
Correct D. Cons\tant population size

Correct Answer: D

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Question 9
The process of exocytosis involves the fusion of vesicles with the plasma membrane. Which of the following is a key component of the SNARE complex that facilitates this process?
A. Syntaxin
B. VAMP
Correct C. SNAP-25
D. Syntaxin-1

Correct Answer: C

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Question 10
The concept of convergent evolution refers to the process by which different species develop similar traits in response to similar environmental pressures. Which of the following examples illustrates convergent evolution?
A. The development of wings in birds and insects
B. The development of limbs in vertebrates
Correct C. The development of eyes in vertebrates and cephalopods
D. The development of fins in fish and whales

Correct Answer: C

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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. 0.16
B. 0.36
Correct C. 0.64
D. 0.84

Correct Answer: C

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Question 12
A researcher is studying the effect of pH on the growth of E. coli. The graph below shows the relationship between pH and growth rate.
A. The growth rate increases as pH increases.
Correct B. The growth rate decreases as pH decreases.
C. The growth rate is unaffected by pH.
D. The growth rate increases as pH decreases.

Correct Answer: B

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Question 13
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'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 14
A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the relationship between temperature and growth rate.
Correct A. The growth rate increases as temperature increases.
B. The growth rate decreases as temperature decreases.
C. The growth rate is unaffected by temperature.
D. The growth rate increases as temperature decreases.

Correct Answer: A

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Question 15
A plant has a genotype of 'Rr' for the flower color gene. If the plant is crossed with another plant that has the genotype 'rr', what is the probability that the offspring will have the genotype 'Rr'?
Correct A. 0.5
B. 0.75
C. 0.9
D. 0.95

Correct Answer: A

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Question 16
In a population of E. coli bacteria, the average generation time is 30 minutes. If the initial population size is 10^6, what is the population size after 4 hours?
Correct A. 10^8
B. 10^7
C. 10^6
D. 10^5

Correct Answer: A

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Question 17
A plant cell has a cell wall, a large central vacuole, and a small nucleus. Which of the following organelles is NOT found in plant cells?
A. Mitochondria
B. Chloroplasts
Correct C. Lysosomes
D. Centrioles

Correct Answer: C

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Question 18
A 2.0 g sample of glu\cose (C6H12O6) is burned in a combustion reaction. If the heat of combustion is 2800 kJ/mol, what is the energy released per gram of glu\cose?
A. 1.4 kJ/g
Correct B. 2.8 kJ/g
C. 4.2 kJ/g
D. 5.6 kJ/g

Correct Answer: B

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Question 19
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Cell wall
B. Vacuole
C. Nucleus
D. Mitochondria

Correct Answer: A

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Question 20
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 21
In a photosynthetic pathway, which enzyme catalyzes the light-dep\endent reaction?
A. RuBisCO
B. ATP synthase
Correct C. Photosystem II
D. Cyclic photophosphorylation

Correct Answer: C

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Question 22
A 20-year-old male patient presents with symptoms of hypogonadism. His FSH and LH levels are elevated. Which of the following is the most likely cause?
A. Kallmann syndrome
B. Hypothalamic-pituitary dysfunction
Correct C. Testicular failure
D. Pituitary tumor

Correct Answer: C

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Question 23
A population of Drosophila melanogaster has a genetic mutation that affects the expression of the white gene. The mutation results in a 50% reduction in the production of the white protein. What is the expected phenotype of the F1 generation?
A. White-eyed
B. Normal-eyed
Correct C. Variegated-eyed
D. Enhanced-eyed

Correct Answer: C

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Question 24
A 35-year-old female patient presents with symptoms of chronic fatigue. Her resting metabolic rate is 1200 kcal/day. What is the expected energy yield from the complete oxidation of 1 mole of glu\cose?
Correct A. -2870 kJ/mol
B. -2870 kJ/mol
C. -2870 kJ/mol
D. -2870 kJ/mol

Correct Answer: A

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Question 25
A population of rabbits is introduced to a new island. The population grows exponentially, with a doubling time of 2 years. What is the expected population size after 10 years?
A. 1024
B. 2048
C. 4096
Correct D. 8192

Correct Answer: D

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