POST UTME NOUN 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the primary function of the Golgi apparatus in a cell?
A. To synthesize proteins
B. To modify and package proteins for secretion
C. To degrade proteins
D. To synthesize lipids
Question 2
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the fixation of a new allele in a population?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 3
A 0.5 M solution of H2SO4 is mixed with a 0.5 M solution of NaOH. What is the resulting solution?
A. Na2SO4
B. H2O
C. H2SO4
D. NaOH
Question 4
Asexual reproduction in plants can occur through the production of
A. Seeds
B. Spores
C. Buds
D. Rhizomes
Question 5
The process of natural selection can lead to the evolution of a population's traits over time. Which of the following is an example of a trait that would be favored by natural selection in a population of birds that live in a forest with a dense canopy?
A. Large wingspan
B. Small beak size
C. Bright plumage
D. Strong legs
Question 6
The process of respiration in humans involves the breakdown of glu\cose to produce energy. Which of the following equations represents this process?
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O_2 \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2 \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
Question 7
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 180
B. 200
C. 220
D. 240
Question 8
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. What type of graph would the researcher most likely use?
A. Bar graph
B. Line graph
C. Scatter plot
D. Histogram
Question 9
A 2.5-liter solution contains 1.5 moles of glu\cose. What is the molarity of the solution?
A. 0.6 M
B. 0.8 M
C. 1.2 M
D. 1.5 M
Question 10
A plant cell has a cell wall composed of cellulose, hemicellulose, and pectin. Which of the following is NOT a component of the cell wall?
A. cellulose
B. hemicellulose
C. pectin
D. lipid bilayer
Question 11
A cell is placed in a hypotonic solution. What happens to the cell?
A. The cell shrinks due to water loss
B. The cell swells due to water uptake
C. The cell remains unchanged
D. The cell bursts due to osmotic pressure
Question 12
A 5.0-gram sample of a compound is found to have a mass of 2.5 grams after being burned in air. If the oxygen consumed is 1.0 gram, what is the empirical formula of the compound?
A. CH4
B. CO2
C. H2O
D. C6H12O6
Question 13
In a population of 1000 individuals, 70% are heterozygous for a particular gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual represented by the Punnett square below?
A. Genotype: BB, Phenotype: Brown eyes
B. Genotype: Bb, Phenotype: Blue eyes
C. Genotype: bb, Phenotype: Brown eyes
D. Genotype: Bb, Phenotype: Brown eyes
Question 14
A solution contains 0.5 moles of sodium chloride (NaCl) in 2.0 liters of water. What is the concentration of the solution in terms of molarity?
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 15
A cell has a respiratory quotient (RQ) of 0.8. If the cell consumes 1.2 × 10^\( -3 \) mol of O2 per minute, what is the rate of CO2 production?
A. 9.6 × 10^\( -4 \) mol/min
B. 1.2 × 10^\( -3 \) mol/min
C. 1.6 × 10^\( -3 \) mol/min
D. 2.0 × 10^\( -3 \) mol/min

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