POST UTME CHRISTOPHER UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human excretory system is shown below. What is the function of the kidneys?
A. Filtering waste from the blood
B. Regulating blood pressure
C. Producing hormones
D. Absorbing nutrients
Question 2
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of the gas is removed, what is the new pressure?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 3
A population of bacteria grows according to the equation N(t) = 1000e^(0.2t), where N(t) is the population size at time t. If the population size is 2000 at time t = 5, what is the growth rate?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 4
A diagram of the human circulatory system is shown below. What is the function of the pulmonary veins?
A. Transport of oxygenated blood from the lungs to the heart
B. Transport of deoxygenated blood from the heart to the lungs
C. Transport of nutrients from the digestive system to the cells
D. Transport of waste products from the cells to the kidneys
Question 5
A diagram of the human eye is shown below. What is the function of the lens?
A. B\ending light to focus on the retina
B. Regulating the amount of light entering the eye
C. Producing tears
D. Absorbing excess light
Question 6
A population of bacteria is growing exponentially in a nutrient-rich environment. If the initial population size is 100 bacteria and the population size doubles every 2 hours, what is the population size after 6 hours?
A. 1000 bacteria
B. 2000 bacteria
C. 4000 bacteria
D. 8000 bacteria
Question 7
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. Production of bile to aid in fat digestion
B. Production of digestive enzymes to aid in protein digestion
C. Production of hormones to regulate blood sugar levels
D. Production of mucus to aid in the movement of food through the digestive system
Question 8
A cell is placed in a medium with a concentration of 10 mM glu\cose. The cell is able to transport glu\cose into the cell u\sing a specific transport protein. What is the expected effect on the cell's growth rate if the concentration of glu\cose in the medium is increased to 20 mM?
A. The cell's growth rate will increase by 50%
B. The cell's growth rate will increase by 100%
C. The cell's growth rate will remain the same
D. The cell's growth rate will decrease by 25%
Question 9
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If 1.5 mol of the gas is added to the flask, what is the new pressure?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 10
A geneticist is studying the inheri\tance of a trait in a population of mice. The trait is controlled by a \single gene with two alleles: A and a. The geneticist finds that the frequency of the A allele is 0.6 and the frequency of the a allele is 0.4. What is the expected genotype and phenotype of the offspring of two heterozygous parents?
A. Genotype: Aa, Phenotype: A
B. Genotype: Aa, Phenotype: a
C. Genotype: AA, Phenotype: A
D. Genotype: aa, Phenotype: a
Question 11
A 2.5-g sample of a subs\tance is dissolved in 25 mL of water. The solution is then titrated with 0.1 M HCl. If 15 mL of HCl is required to reach the equivalence point, what is the molar mass of the subs\tance?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 12
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. 1.0
Question 13
A 5 L flask contains 3 mol of an ideal gas at 37°C. If the gas is compressed to 2 L, what is the new temperature?
A. 27°C
B. 37°C
C. 47°C
D. 57°C
Question 14
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the function of the xylem tissue?
A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and storage
D. Protection from pathogens
Question 15
A patient has been diagnosed with a bacterial infection. Which of the following antibiotics would be most effective in treating the infection?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
D. Vancomycin

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