POST UTME REDEEMERS UNIVERSITY 2023 Biology | Objective

Are you preparing for POST UTME REDEEMERS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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'?
A. 0.36
Correct B. 0.64
C. 0.16
D. 0.04

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A 2.0 L flask contains 1.0 mol of an ideal gas at 300 K. If the gas is heated to 400 K at cons\tant volume, what is the new pressure?
A. 1.5 atm
B. 2.0 atm
Correct C. 2.5 atm
D. 3.0 atm

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 5
B. 6
Correct C. 7
D. 8

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
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'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
In the context of evolutionary bio\logy, what is the primary mechanism by which genetic drift acts to reduce genetic variation within a population?
A. Mutation
B. Genetic recombination
C. Gene flow
Correct D. Genetic drift

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A researcher is studying the structure of a protein u\sing X-ray crystal\lography. Which of the following types of radiation is most likely to be used in this technique?
A. Gamma rays
Correct B. X-rays
C. Alpha particles
D. Beta particles

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins
Correct B. To store genetic information
C. To regulate cell growth
D. To transport subs\tances across the cell membrane

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
A researcher is studying the effects of a new antibiotic on a bacterial population. Which of the following types of data would be most useful for determining the effectiveness of the antibiotic?
A. Growth rate of the bacteria
Correct B. Viability of the bacteria
C. Concentration of the antibiotic
D. pH of the growth medium

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A diagram of a human eye is shown below. What is the function of the structure labeled 'B'?
A. To focus light on the retina
Correct B. To regulate the amount of light entering the eye
C. To detect color
D. To detect movement

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
In the context of evolutionary theories, what is the primary mechanism by which genetic drift can lead to the loss of genetic variation in a population?
A. Gene flow
B. Mutation
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
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 movement
C. To regulate the amount of light entering the eye
D. To produce tears

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
In the process of photosynthesis, what is the role of the enzyme RuBisCO?
Correct A. To convert CO2 into glu\cose
B. To convert glu\cose into CO2
C. To regulate the amount of light entering the chloroplast
D. To produce ATP

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
A diagram of the human nervous system is shown below. What is the function of the part labeled 'B'?
Correct A. To transmit signals from the senses to the brain
B. To regulate the amount of blood flowing to the brain
C. To produce hormones
D. To control voluntary movements

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
In the context of hormonal regulation, what is the primary function of the hormone insulin?
Correct A. To regulate blood sugar levels
B. To stimulate the breakdown of glycogen
C. To produce glu\cose from non-carbohydrate sources
D. To regulate the amount of blood flowing to the muscles

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
In a population of 1000 individuals, the frequency of the dominant allele is 0.6. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?
Correct A. 0.2
B. 0.3
C. 0.4
D. 0.5

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
A 2.5 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
Correct C. 1.5 M
D. 2.0 M

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours. If the plant is grown for 30 days, what is the expected growth rate?
A. 2 cm/day
B. 3 cm/day
Correct C. 4 cm/day
D. 5 cm/day

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A 50-year-old man is diagnosed with a rare genetic disorder that affects his sense of smell. Which of the following is the most likely cause of his condition?
Correct A. Genetic mutation in the OR6A2 gene
B. Genetic mutation in the TAS2R38 gene
C. Genetic mutation in the TRPV1 gene
D. Genetic mutation in the P2RY8 gene

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
A 10-year-old girl is diagnosed with a rare disease that affects her ability to regulate her body temperature. Which of the following is the most likely cause of her condition?
A. Genetic mutation in the TRPV1 gene
Correct B. Genetic mutation in the TRPM8 gene
C. Genetic mutation in the KCNQ1 gene
D. Genetic mutation in the SCN9A gene

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
A 20-year-old man is diagnosed with a rare disease that affects his ability to regulate his blood sugar levels. Which of the following is the most likely cause of his condition?
Correct A. Genetic mutation in the HNF1A gene
B. Genetic mutation in the HNF4A gene
C. Genetic mutation in the PDX1 gene
D. Genetic mutation in the INS gene

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
A 30-year-old woman is diagnosed with a rare disease that affects her ability to regulate her blood pressure. Which of the following is the most likely cause of her condition?
Correct A. Genetic mutation in the ACE gene
B. Genetic mutation in the AGT gene
C. Genetic mutation in the CYP11B2 gene
D. Genetic mutation in the CYP21A2 gene

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
A 40-year-old man is diagnosed with a rare disease that affects his ability to regulate his body temperature. Which of the following is the most likely cause of his condition?
A. Genetic mutation in the TRPV1 gene
Correct B. Genetic mutation in the TRPM8 gene
C. Genetic mutation in the KCNQ1 gene
D. Genetic mutation in the SCN9A gene

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?
A. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
A 2.5 L flask contains a mixture of CO2 and O2 at 25°C and 1 atm. If 0.5 L of O2 is removed, what is the partial pressure of CO2?
A. 0.2 atm
Correct B. 0.5 atm
C. 0.8 atm
D. 1.0 atm

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support