POST UTME MADONNA UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AaBbDd. What is the probability that the offspring will have the genotype AaBbCc?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 2
A 2.5 L flask contains 0.5 M NaCl at 25°C. What is the total number of moles of gas present in the flask?
A. 0.1 mol
B. 0.2 mol
C. 0.3 mol
D. 0.4 mol
Question 3
The process of meiosis in eukaryotic cells results in the production of gametes. Which of the following is a key difference between meiosis and mitosis?
A. Meiosis results in the production of diploid cells, while mitosis results in the production of haploid cells
B. Meiosis results in the production of haploid cells, while mitosis results in the production of diploid cells
C. Meiosis occurs in somatic cells, while mitosis occurs in reproductive cells
D. Meiosis occurs in reproductive cells, while mitosis occurs in somatic cells
Question 4
In a population of 1000 Drosophila melanogaster, 700 are homozygous dominant (BB), 200 are heterozygous (Bb), and 100 are homozygous recessive (bb). What is the frequency of the B allele?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 5
A diagram of a plant's xylem and phloem tissues is shown below. Which of the following statements is true regarding the transport of water and nutrients in this plant?
A. Water and nutrients are transported through the xylem
B. Water and nutrients are transported through the phloem
C. Water is transported through the xylem, while nutrients are transported through the phloem
D. Neither water nor nutrients are transported through the xylem or phloem
Question 6
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH
Question 7
In the context of evolutionary bio\logy, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 8
In the context of evolutionary theory, what is the primary mechanism by which genetic drift occurs?
A. Natural selection
B. Genetic mutation
C. Gene flow
D. Random sampling of alleles
Question 9
A plant with the genotype AaBbCcc is crossed with a plant with the genotype Aabbcc. What is the probability that the offspring will have the genotype AaBbCc?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 10
A researcher studying the eco\logy of a freshwater lake observes that the water temperature varies between 10°C and 25°C throughout the year. What is the likely effect of this temperature fluctuation on the metabolic rate of aquatic organisms?
A. Increased metabolic rate
B. Decreased metabolic rate
C. No effect on metabolic rate
D. Variable metabolic rate
Question 11
A diagram of a human nervous system is shown below. Which of the following statements is true regarding the structure of the nervous system?
A. The brain is the control center of the nervous system
B. The spinal cord is the part of the nervous system that connects the brain to the rest of the body
C. The nerves are the part of the nervous system that transmit signals to and from the brain
D. All of the above
Question 12
In a population of 100 individuals, 20 individuals have the genotype 'AA', 40 individuals have the genotype 'Aa', and 40 individuals have the genotype 'aa'. What is the frequency of the 'A' allele?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 13
A researcher is studying the structure of a protein. Which of the following is a likely function of the \alpha helix?
A. Stabilization of the protein
B. Regulation of protein activity
C. Transport of molecules across cell membranes
D. Storage of genetic information
Question 14
In the context of cellular respiration, what is the primary function of the mitochondria?
A. Protein synthesis
B. Cell signaling
C. Energy production
D. Cell division
Question 15
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting changes in light intensity?
A. Cornea
B. Iris
C. Retina
D. Lens

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