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POST UTME COAL CITY UNIVERSITY 2018 Biology | Objective

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Question 1

In the process of osmoregulation, what is the primary function of the kidneys in a hypertonic environment?

Correct A. To excrete excess water

B. To reabsorb excess ions

C. To regulate blood pressure

D. To maintain acid-base balance

Correct Answer: A

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Question 2

What is the term for the process by which a cell divides into two daughter cells of equal size?

Correct A. Mitosis

B. Meiosis

C. Binary fission

D. Endoreduplication

Correct Answer: A

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Question 3

A diagram of a cell is shown below. Identify the part labeled A.

Correct A. Nucleus

B. Mitochondria

C. Endoplasmic reticulum

D. Golgi apparatus

Correct Answer: A

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Question 4

What is the term for the process by which a microorganism becomes resis\tant to an antibiotic?

A. Mutation

B. Gene expression

Correct C. Horizontal gene transfer

D. Antibiotic resis\tance

Correct Answer: C

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Question 5

A diagram of a genetic cross is shown below. What is the probability of an offspring being homozygous dominant?

Correct A. 1/2

B. 1/4

C. 3/4

D. 2/3

Correct Answer: A

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Question 6

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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 7

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'?

Correct A. 0.5

B. 0.75

C. 0.25

D. 0.33

Correct Answer: A

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Question 8

A solution of 0.1 M glu\cose is placed in a dialysis bag and submerged in a 0.5 M glu\cose solution. What is the concentration of glu\cose in the dialysis bag after 1 hour?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 9

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'?

Correct A. 0.5

B. 0.75

C. 0.25

D. 0.33

Correct Answer: A

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Question 10

A solution of 0.1 M glu\cose is placed in a dialysis bag and submerged in a 0.5 M glu\cose solution. What is the concentration of glu\cose in the dialysis bag after 2 hours?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 11

In a forest e\cosystem, a deer population is limited by the availability of food. If the deer population grows at a rate proportional to the product of the current population and the difference between the carrying capacity and the current population, derive a differential equation to model this situation.

A. P\frac{dP}{dt} = rP\left\( 1 - \frac{P}{K}\right \)

B. \\frac{dP}{dt} = rP\\left\( 1 + \\frac{P}{K}\\right \)

C. P\frac{dP}{dt} = rP\left\( 1 + \frac{P}{K}\right \)

Correct D. \\frac{dP}{dt} = rP\\left\( 1 - \\frac{P}{K}\\right \)

Correct Answer: D

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Question 12

A plant absorbs CO2 and releases O2 through photosynthesis. If the plant absorbs 100 g of CO2 and releases 120 g of O2, what is the ratio of the mass of CO2 absorbed to the mass of O2 released?

Correct A. 1:2

B. 2:1

C. 1:1

D. 3:2

Correct Answer: A

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Question 13

A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 14

A car travels from city A to city B at an average speed of 60 km/h. If the dis\tance between the two cities is 240 km, how long does the trip take?

A. 4 hours

Correct B. 5 hours

C. 6 hours

D. 8 hours

Correct Answer: B

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Question 15

A rec\tangular prism has a length of 5 cm, a width of 3 cm, and a height of 2 cm. What is the volume of the prism?

Correct A. 30 cm^3

B. 50 cm^3

C. 60 cm^3

D. 70 cm^3

Correct Answer: A

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Question 16

A company produces two products, A and B. Product A requires 2 hours of labor and 1 hour of machine time, while product B requires 1 hour of labor and 2 hours of machine time. If the company has 8 hours of labor and 10 hours of machine time available, how many units of product A and product B should the company produce to maximize profit?

Correct A. 10 units of A, 5 units of B

B. 5 units of A, 10 units of B

C. 15 units of A, 3 units of B

D. 20 units of A, 2 units of B

Correct Answer: A

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Question 17

A firm produces two goods, X and Y. The production of good X requires 2 hours of labor and 1 hour of machine time, while the production of good Y requires 1 hour of labor and 2 hours of machine time. If the firm has 8 hours of labor and 10 hours of machine time available, how many units of good X and good Y should the firm produce to maximize profit?

Correct A. 10 units of X, 5 units of Y

B. 5 units of X, 10 units of Y

C. 15 units of X, 3 units of Y

D. 20 units of X, 2 units of Y

Correct Answer: A

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Question 18

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. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 19

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of gas is added to the flask at the same temperature, what is the new pressure of the gas?

A. 2.5 atm

Correct B. 3.0 atm

C. 4.0 atm

D. 5.0 atm

Correct Answer: B

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Question 20

A plant has a genotype of 'Rr' for the flower color gene. If the plant is crossed with a plant having the genotype 'RR', what is the probability that the offspring will have the genotype 'RR'?

A. 0.25

Correct B. 0.50

C. 0.75

D. 1.0

Correct Answer: B

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Question 21

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?

Correct A. 7.0

B. 8.0

C. 9.0

D. 10.0

Correct Answer: A

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Question 22

A population of rabbits has a birth rate of 0.05 and a death rate of 0.02. If the initial population size is 100, what is the population size after 5 years?

A. 150

B. 200

Correct C. 250

D. 300

Correct Answer: C

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Question 23

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, resulting in the release of the chromosomes into the cytoplasm. Which of the following structures is responsible for the breakdown of the nuclear envelope?

Correct A. Nuclear lamina

B. Nuclear envelope

C. Mitotic spindle

D. Centrioles

Correct Answer: A

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Question 24

The process of cellular respiration involves the breakdown of glu\cose to produce ATP. Which of the following stages of cellular respiration is responsible for the production of ATP?

A. Glycolysis

B. Citric acid cycle

Correct C. Electron transport chain

D. Fermentation

Correct Answer: C

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Question 25

In the process of natural selection, which of the following is an example of a selective pressure?

A. Genetic drift

B. Mutation

C. Genetic variation

Correct D. Predation

Correct Answer: D

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