POST UTME LAUTECH 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the genetic variation of a specific trait in a population of 500 individuals. The trait is determined by a \single gene with two alleles: A and a. The frequency of allele A is 0.6, and the frequency of allele a is 0.4. What is the expected frequency of the AA genotype in the population?
A. 0.36
B. 0.36
C. 0.36
D. 0.36
Question 2
A population of bacteria grows according to the equation N(t) = N0e^(kt), where N(t) is the population size at time t, N0 is the initial population size, e is the base of the natural \logarithm, and k is the growth rate. If the population size doubles every 2 hours, what is the growth rate?
A. 0.05 h^\( -1 \)
B. 0.10 h^\( -1 \)
C. 0.15 h^\( -1 \)
D. 0.20 h^\( -1 \)
Question 3
A 0.5 L solution of 0.1 M NaCl is mixed with a 1.0 L solution of 0.2 M NaCl. What is the concentration of the resulting solution?
A. 0.12 M
B. 0.15 M
C. 0.18 M
D. 0.20 M
Question 4
A 2.5 kg block of wood is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.5 m, what is the potential energy stored in the spring?
A. 12.5 J
B. 25 J
C. 37.5 J
D. 50 J
Question 5
A plant has a photosynthetic rate of 10 mg CO2/h. If the plant is exposed to light for 8 hours, how much CO2 will be fixed?
A. 80 mg
B. 100 mg
C. 120 mg
D. 140 mg
Question 6
A 10ml sample of a solution containing 0.5M NaCl is mixed with 20ml of water. What is the new concentration of the solution?
A. 0.25M
B. 0.5M
C. 0.75M
D. 1.0M
Question 7
A 5% solution of glu\cose in water is mixed with a 10% solution of glu\cose in water. What is the concentration of the resulting solution?
A. 6.25%
B. 7.5%
C. 8.33%
D. 9.375%
Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. Photosynthesis
B. Respiration
C. Transport of materials
D. Storage of nutrients
Question 9
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, and 60% of the susceptible bacteria die, what is the expected number of surviving bacteria?
A. 600
B. 640
C. 680
D. 720
Question 10
A geneticist is studying the inheri\tance of a trait in a family. She collects data on the trait and creates a Punnett square to predict the probability of the trait being expressed in offspring. What is the probability of the offspring expres\sing the dominant trait?
A. 0.5
B. 0.75
C. 0.25
D. 0.33
Question 11
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?
A. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 12
A researcher is studying the effect of antibiotics on the growth of bacteria. She measures the growth rate of the bacteria in the presence and absence of antibiotics and plots the data on a graph. Which of the following types of graphs would best represent the data?
A. A scatter plot
B. A line graph
C. A bar chart
D. A histogram
Question 13
A bio\logist is studying the structure of a cell. She observes the cell under a microscope and notes the presence of a nucleus, mitochondria, and ribosomes. What is the primary function of the ribosomes in the cell?
A. Protein synthesis
B. Cell signaling
C. Cell division
D. Cell growth
Question 14
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears
Question 15
In a population of 1000 individuals, 200 are heterozygous for a particular gene. If the gene is inherited in a simple M\endelian fashion, what is the frequency of the recessive allele?
A. 0.1
B. 0.2
C. 0.3
D. 0.4

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