POST UTME BELLS UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 individuals, the Hardy-Weinberg principle predicts that the frequency of the recessive allele (q) is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele (p)?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 2
A 2.0 L flask contains 0.5 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 3
A plant cell has a vacuole that contains 0.5 M sucrose solution. If the cell membrane is permeable to water but not to sucrose, what will happen to the cell?
A. The cell will shrink.
B. The cell will swell.
C. The cell will remain unchanged.
D. The cell will burst.
Question 4
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To generate ATP through oxidative phosphorylation
C. To generate NADH and FADH2
D. To generate ATP through glycolysis
Question 5
In the context of excretion, what is the primary function of the kidneys?
A. To regulate blood pressure
B. To filter waste products from the blood
C. To produce hormones
D. To maintain electrolyte balance
Question 6
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 7
The concept of natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key mechanism of natural selection?
A. Genetic drift
B. Gene flow
C. Mutation
D. Variation in fitness
Question 8
The sense organ responsible for detecting changes in light intensity is the?
A. Eye
B. Ear
C. Nose
D. Tongue
Question 9
What is the term for the process by which microorganisms such as bacteria and fungi break down dead organic matter?
A. Decomposition
B. Respiration
C. Photosynthesis
D. Fermentation
Question 10
The process of natural selection can be described as a mechanism that favors the survival and reproduction of individuals with traits that are better suited to their environment. Which of the following is a key consequence of this process?
A. Increased genetic variation within a population
B. Reduced genetic variation within a population
C. No change in genetic variation within a population
D. Increased genetic variation between populations
Question 11
The structure of the human eye is adapted to focus light onto the retina. Which part of the eye is responsible for changing the shape of the lens to achieve this focus?
A. Cornea
B. Iris
C. Ciliary muscles
D. Retina
Question 12
The e\cosystem of a coral reef is characterized by a diverse array of species. What is the primary source of energy for this e\cosystem?
A. Photosynthesis
B. Decomposition
C. Detritivory
D. Herbivory
Question 13
In the process of photosynthesis, what is the primary function of the light-dep\endent reactions?
A. To generate ATP and NADPH
B. To generate glu\cose and oxygen
C. To generate ATP and oxygen
D. To generate NADPH and glu\cose
Question 14
The bacterium Escherichia coli (E. coli) is a common inhabi\tant of the human gut. What is the primary function of the flagella in E. coli?
A. To produce ATP
B. To move the bacterium through the gut
C. To synthesize proteins
D. To degrade carbohydrates
Question 15
In a photosynthetic pathway, which enzyme catalyzes the conversion of ribulose-1,5-bisphosphate to 3-phosphoglycerate?
A. Ribulose-5-phosphate kinase
B. Ribulose-1,5-bisphosphate carboxylase/oxygenase
C. Phosphoglycerate kinase
D. Phosphoglycerate mutase

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