POST UTME VERITAS UNIVERSITY 2020 Biology | Objective

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Question 1
A cell is placed in a solution with a pH of 7.5. What is the concentration of hydrogen ions in this solution?
A. 1.26 \times 10^{-8} M
B. 2.51 \times 10^{-8} M
C. 5.01 \times 10^{-8} M
D. 1.01 \times 10^{-7} M
Question 2
A cell has a membrane potential of -70 mV. If a 10 mV depolarization occurs, what is the new membrane potential?
A. -60 mV
B. -70 mV
C. -80 mV
D. -90 mV
Question 3
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. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 4
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
C. Nucleus
D. Vacuole
Question 5
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. 1/2
B. 1/3
C. 2/3
D. 3/4
Question 6
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
B. 0.5
C. 0.75
D. 0.9
Question 7
A solution of glu\cose (C6H12O6) is titrated with a solution of potassium permanganate (KMnO4). The balanced equation for the reaction is:
A. C6H12O6 + 6KMnO4 → 6K2CO3 + 6MnO2 + 6H2O
B. C6H12O6 + 6KMnO4 → 6K2CO3 + 6MnO2 + 6H2O + 6H2
C. C6H12O6 + 6KMnO4 → 6K2CO3 + 6MnO2 + 6H2O + 6H2
D. C6H12O6 + 6KMnO4 → 6K2CO3 + 6MnO2 + 6H2O + 6H2O
Question 8
In a eukaryotic cell, the process of photosynthesis occurs in the mitochondria.
A. True
B. False
C. Photosynthesis occurs in the chloroplasts
D. Photosynthesis occurs in the cytoplasm
Question 9
A population of rabbits is growing at a rate of 20% per year. If the initial population size is 100, what will be the population size after 5 years?
A. 1610
B. 1000
C. 400
D. 1600
Question 10
What is the primary function of the Golgi apparatus in a cell?
A. To synthesize proteins from amino acids
B. To modify and package proteins for transport
C. To synthesize lipids from fatty acids
D. To synthesize carbohydrates from glu\cose
Question 11
In the context of hormonal coordination, what is the primary function of the hypothalamus in regulating the pituitary gland?
A. To secrete hormones that stimulate the pituitary gland
B. To inhibit the secretion of hormones by the pituitary gland
C. To regulate the secretion of hormones by the adrenal glands
D. To stimulate the secretion of hormones by the thyroid gland
Question 12
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by adjusting the amount of ions in the urine
D. To produce a highly concentrated urine by reabsorbing water from the filtrate
Question 13
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 dominant allele 'A'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 14
A diagram of the human nervous system is shown below. Which part of the nervous system is responsible for transmitting signals from sensory receptors to the brain?
A. Sensory receptor
B. Axon
C. D\endrite
D. Synapse
Question 15
What is the primary function of the pancreas in the regulation of blood glu\cose levels?
A. To produce insulin to lower blood glu\cose levels
B. To produce glucagon to raise blood glu\cose levels
C. To produce both insulin and glucagon to regulate blood glu\cose levels
D. To produce neither insulin nor glucagon

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