POST UTME CRAWFORD UNIVERSITY 2018 Biology | Objective

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Question 1
In a study on the eco\logy of a freshwater lake, researchers observed that the population of zooplankton increased exponentially with the concentration of nutrients in the water. If the population of zooplankton is modeled by the equation P(t) = P0 * e^(kt), where P0 is the initial population, e is the base of the natural \logarithm, and k is a cons\tant, and if the population of zooplankton is 1000 at time t = 0, and 2000 at time t = 2, what is the value of k?
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 2
A researcher is studying the effect of pH on the growth of a microorganism. The researcher measures the growth of the microorganism at different pH levels and plots the data on a graph. If the graph shows a sigmoidal curve, what does this indicate about the effect of pH on the growth of the microorganism?
A. The microorganism grows best at low pH levels.
B. The microorganism grows best at high pH levels.
Correct C. The microorganism grows best at intermediate pH levels.
D. The microorganism does not grow at any pH level.

Correct Answer: C

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Question 3
A patient is diagnosed with a disease caused by a virus that infects the liver. The virus replicates by hijacking the host cell's machinery to produce new viral particles. If the patient is treated with a drug that inhibits the replication of the virus, what is the likely effect on the patient's liver function?
Correct A. The liver function will improve.
B. The liver function will worsen.
C. The liver function will remain the same.
D. The liver function will be unaffected.

Correct Answer: A

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Question 4
A researcher is studying the structure of a protein that is involved in the transmission of a disease. The protein has a specific shape that allows it to bind to a receptor on the surface of a host cell. If the researcher mutates the protein to change its shape, what is the likely effect on the protein's ability to bind to the receptor?
A. The protein's ability to bind to the receptor will improve.
Correct B. The protein's ability to bind to the receptor will worsen.
C. The protein's ability to bind to the receptor will remain the same.
D. The protein's ability to bind to the receptor will be unaffected.

Correct Answer: B

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Question 5
A patient is diagnosed with a disease caused by a bacterium that infects the lungs. The bacterium produces a toxin that causes inflammation and damage to the lung tissue. If the patient is treated with a drug that inhibits the production of the toxin, what is the likely effect on the patient's lung function?
Correct A. The lung function will improve.
B. The lung function will worsen.
C. The lung function will remain the same.
D. The lung function will be unaffected.

Correct Answer: A

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Question 6
In the context of the human visual system, what is the primary function of the fovea?
A. To detect movement
B. To perceive color
Correct C. To focus light
D. To detect depth

Correct Answer: C

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Question 7
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell?
Correct A. The cell will swell and eventually burst
B. The cell will shrink and lose water
C. The cell will remain unchanged
D. The cell will undergo mitosis

Correct Answer: A

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Question 8
A diagram of the human heart is shown below. What is the function of the tricuspid valve?
Correct A. To prevent blood from flowing back into the atrium
B. To allow blood to flow from the atrium to the ventricle
C. To regulate blood pressure
D. To control heart rate

Correct Answer: A

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Question 9
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. To produce bile
Correct B. To produce digestive enzymes
C. To absorb nutrients
D. To regulate blood sugar levels

Correct Answer: B

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Question 10
A diagram of the human respiratory system is shown below. What is the function of the diaphragm?
A. To regulate blood pressure
B. To control heart rate
Correct C. To expand the chest cavity
D. To contract the chest cavity

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 nerve impulses?
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 identified as Staphylococcus aureus. Which of the following diseases is most likely caused by this microorganism?
A. Meningitis
B. Pneumonia
Correct C. Skin infection
D. Gastroenteritis

Correct Answer: C

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Question 13
The diagram below shows the structure of the human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 14
A cell is placed in a solution with a high concentration of salt. Which of the following processes will occur in the cell?
Correct A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: A

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Question 15
The diagram below shows the process of mitosis. Which stage of mitosis is characterized by the separation of chromosomes?
A. Prophase
B. Metaphase
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 16
The hormone responsible for the regulation of blood pressure is
A. Adrenaline
B. Insulin
Correct C. Aldosterone
D. Antidiuretic hormone

Correct Answer: C

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Question 17
The process by which plants transport water and minerals from the roots to the leaves is called
A. Transpiration
B. Photosynthesis
C. Respiration
Correct D. Translocation

Correct Answer: D

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Question 18
The classification of living organisms into five kingdoms is based on
A. Cell structure
B. Metabolism
C. Cellular organization
Correct D. Genetic material

Correct Answer: D

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Question 19
The process by which the body gets rid of waste products is called
Correct A. Excretion
B. Osmoregulation
C. Respiration
D. Photosynthesis

Correct Answer: A

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Question 20
The microorganism responsible for the production of antibiotics is
A. Bacillus subtilis
B. Escherichia coli
C. Staphylococcus aureus
Correct D. Penicillium chrysogenum

Correct Answer: D

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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 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 22
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'Tt'. What is the probability that the offspring will have the genotype 'tt'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 23
In a human population, the frequency of the recessive allele 'a' is 0.1. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
A. 0.01
Correct B. 0.09
C. 0.19
D. 0.29

Correct Answer: B

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Question 24
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'Tt'?
Correct A. 0.5
B. 0.75
C. 0.9
D. 0.95

Correct Answer: A

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Question 25
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.3. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
Correct A. 0.49
B. 0.61
C. 0.73
D. 0.85

Correct Answer: A

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