POST UTME COVENANT UNIVERSITY 2021 Biology | Objective

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Question 1 View Details
In a population of 1000 Drosophila melanogaster, 200 individuals are homozygous dominant for the gene controlling eye color, 400 are heterozygous, and 400 are homozygous recessive. What is the frequency of the dominant allele?
Correct A. 0.4
B. 0.6
C. 0.8
D. 0.2

Correct Answer: A

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Question 2 View Details
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is its angular frequency?
A. 10 rad/s
Correct B. 20 rad/s
C. 5 rad/s
D. 15 rad/s

Correct Answer: B

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Question 3 View Details
A researcher is studying the effect of pH on the growth of Escherichia coli. The researcher measures the growth rate of the bacteria at different pH levels and obtains the following data: pH 5.5, growth rate 0.5; pH 6.0, growth rate 0.7; pH 6.5, growth rate 0.9. What is the best estimate of the growth rate at pH 7.0?
Correct A. 1.1
B. 1.0
C. 0.9
D. 0.8

Correct Answer: A

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Question 4 View Details
A 5.0 L container is filled with a mixture of 2.0 mol of O2 and 3.0 mol of CO2 at 25°C. What is the partial pressure of O2 in the container?
A. 0.25 atm
Correct B. 0.50 atm
C. 0.75 atm
D. 1.00 atm

Correct Answer: B

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Question 5 View Details
A 10.0 g sample of a compound is analyzed by combustion analysis and found to contain 6.0 g of carbon and 4.0 g of hydrogen. What is the empirical formula of the compound?
Correct A. CH2O
B. C2H4O
C. C3H6O
D. C4H8O

Correct Answer: A

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Question 6 View Details
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'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.80

Correct Answer: A

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Question 7 View Details
A 2.5 cm long fish is placed in a \tank with a 5 cm long fish. If the \tank is 10 cm long, what is the ratio of the dis\tance the 2.5 cm long fish can swim to the dis\tance the 5 cm long fish can swim?
A. 1:2
Correct B. 1:3
C. 2:3
D. 3:4

Correct Answer: B

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Question 8 View Details
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. photosynthesis
B. respiration
Correct C. cell division
D. cell signaling

Correct Answer: C

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Question 9 View Details
A 10 mL sample of a solution containing 0.5 M NaCl is diluted to 50 mL. What is the concentration of the resulting solution?
A. 0.01 M
Correct B. 0.05 M
C. 0.1 M
D. 0.5 M

Correct Answer: B

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Question 10 View Details
A diagram of a human eye is shown below. What is the function of the structure labeled 'Y'?
A. focu\sing light
Correct B. detecting light
C. regulating light
D. absorbing light

Correct Answer: B

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Question 11 View Details
In a diploid cell, what is the total number of alleles for a \single gene locus if the genotype is AaBb?
Correct A. 6
B. 4
C. 8
D. 2

Correct Answer: A

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Question 12 View Details
A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype rrSS?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 13 View Details
A population of rabbits has a mean weight of 2.5 kg with a s\tandard deviation of 0.5 kg. If a random sample of 16 rabbits is taken, what is the probability that the sample mean will be greater than 2.8 kg?
Correct A. 0.05
B. 0.1
C. 0.2
D. 0.3

Correct Answer: A

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Question 14 View Details
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect light intensity
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 15 View Details
A diagram of the human brain is shown below. What is the function of the part labeled 'B'?
A. To control voluntary movements
B. To regulate body temperature
Correct C. To process sensory information
D. To produce hormones

Correct Answer: C

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Question 16 View Details
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?
Correct A. 180
B. 200
C. 220
D. 240

Correct Answer: A

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Question 17 View Details
A cell in interphase has a DNA content of 2C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?
A. 2C
Correct B. 4C
C. 1C
D. 3C

Correct Answer: B

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Question 18 View Details
The diagram below shows the structure of a mitochondrion. Which of the following is NOT a function of the mitochondrion?
A. Generating ATP
B. Regulating cell growth
Correct C. Synthesizing proteins
D. Regulating cell division

Correct Answer: C

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Question 19 View Details
The process of meiosis results in the production of which of the following?
Correct A. Haploid gametes
B. Diploid zygotes
C. Triploid cells
D. Quadruploid cells

Correct Answer: A

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Question 20 View Details
The diagram below shows the structure of a plant cell. Which of the following is NOT a component of the plant cell?
A. Cell wall
B. Chloroplast
C. Mitochondrion
Correct D. Ribosome

Correct Answer: D

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Question 21 View Details
The nervous system's coordination is primarily achieved through the
A. release of neurotransmitters
Correct B. action potentials in neurons
C. synaptic plasticity
D. neurotransmitter reuptake

Correct Answer: B

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Question 22 View Details
The hormone insulin plays a crucial role in glu\cose regulation by
A. stimulating glycogen synthesis
B. inhibiting gluconeogenesis
Correct C. facilitating glu\cose uptake in cells
D. regulating lipolysis

Correct Answer: C

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Question 23 View Details
The process of natural selection acts on
Correct A. genetic variation within a population
B. environmental factors affecting a population
C. phenotypic traits of an individual
D. genetic drift in a population

Correct Answer: A

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Question 24 View Details
The sense organ responsible for detecting changes in sound pressure is the
Correct A. cochlea
B. stapes
C. tympanic membrane
D. auditory nerve

Correct Answer: A

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Question 25 View Details
The biotic factor that plays a crucial role in shaping the structure of an e\cosystem is
A. predation
Correct B. competition
C. mutualism
D. symbiosis

Correct Answer: B

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