POST UTME CRAWFORD UNIVERSITY 2018 Biology | Objective

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Question 1
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'?
A. 0.49
B. 0.61
C. 0.73
D. 0.85
Question 2
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following is a characteristic of this bacterium?
A. Gram-positive
B. Gram-negative
C. Spore-forming
D. Motile
Question 3
The diagram below shows the process of mitosis. Which stage of mitosis is characterized by the separation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 4
The process by which the body gets rid of waste products is called
A. Excretion
B. Osmoregulation
C. Respiration
D. Photosynthesis
Question 5
The microorganism responsible for the production of antibiotics is
A. Bacillus subtilis
B. Escherichia coli
C. Staphylococcus aureus
D. Penicillium chrysogenum
Question 6
The diagram below shows the structure of the human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 7
In the human eye, what is the primary function of the lens?
A. To focus light on the retina
B. To regulate the amount of light entering the eye
C. To detect light and color
D. To produce tears
Question 8
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.
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.
Question 9
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell?
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
Question 10
A 2.5 cm long bone is subjected to a compressive force of 50 N. If the Young's modulus of the bone is 20 GPa, calculate the stress experienced by the bone.
A. 2.5 MPa
B. 5 MPa
C. 10 MPa
D. 20 MPa
Question 11
In the xylem transport system, what is the primary function of the tracheids?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To provide structural support to the plant
D. To regulate the rate of transpiration
Question 12
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
B. 1.0
C. 1.5
D. 2.0
Question 13
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?
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.
Question 14
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. If the reaction is carried out in a 1 L flask, calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 15
A diagram of the human heart is shown below. What is the function of the tricuspid valve?
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

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