POST UTME AFE BABALOLA UNIVERSITY 2019 Biology | Objective

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Question 1 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. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

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Question 2 View Details
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas, in atm, if the gas cons\tant R = 0.082 L atm/mol K?
A. 1.5 atm
Correct B. 2.5 atm
C. 3.5 atm
D. 4.5 atm

Correct Answer: B

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Question 3 View Details
A diagram shows a plant cell with a large central vacuole and a small nucleus. Which of the following structures is NOT found in this cell?
A. Mitochondrion
B. Vacuole
C. Nucleus
Correct D. Chloroplast

Correct Answer: D

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Question 4 View Details
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 5 View Details
A diagram shows a simple harmonic motion with a period of 2 s. What is the frequency of this motion?
A. 0.5 Hz
B. 1 Hz
C. 1.5 Hz
Correct D. 2 Hz

Correct Answer: D

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Question 6 View Details
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
Correct B. No mutation
C. No gene flow
D. No natural selection

Correct Answer: B

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Question 7 View Details
A species of bird has a wing length of 10 cm with a s\tandard deviation of 2 cm. If a sample of 100 birds is taken, what is the probability that the mean wing length of the sample will be less than 9 cm?
Correct A. 0.025
B. 0.05
C. 0.1
D. 0.2

Correct Answer: A

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Question 8 View Details
A diagram of a plant cell is shown below. Which of the following organelles is responsible for protein synthesis?
A. Nucleus
Correct B. Ribosome
C. Mitochondria
D. Endoplasmic reticulum

Correct Answer: B

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Question 9 View Details
A population of 1000 individuals has a mean height of 170 cm with a s\tandard deviation of 10 cm. If a sample of 50 individuals is taken, what is the probability that the sample mean will be greater than 175 cm?
Correct A. 0.05
B. 0.1
C. 0.2
D. 0.3

Correct Answer: A

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Question 10 View Details
A diagram of a human eye is shown below. Which of the following structures is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 11 View Details
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 12 View Details
Which of the following tissues is primarily responsible for the production of mucus in the respiratory tract?
A. Stratified squamous epithelium
B. Ciliated columnar epithelium
Correct C. Pseudostratified columnar epithelium
D. Simple cuboidal epithelium

Correct Answer: C

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Question 13 View Details
What is the primary function of the Golgi apparatus in eukaryotic cells?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
Correct D. Protein modification and transport

Correct Answer: D

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Question 14 View Details
Which of the following types of respiration is characterized by the breakdown of glu\cose to produce ATP in the absence of oxygen?
A. Aerobic respiration
Correct B. Anaerobic respiration
C. Fermentation
D. Photosynthesis

Correct Answer: B

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Question 15 View Details
What is the primary mechanism by which the immune system distinguishes between self and non-self cells?
A. Antigen presentation
B. Complement system
C. Cytokine signaling
Correct D. Major histocompatibility complex (MHC) molecules

Correct Answer: D

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Question 16 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
Correct A. 0.4
B. 0.6
C. 0.8
D. 0.2

Correct Answer: A

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Question 17 View Details
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

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Question 18 View Details
A solution containing 0.1 M glu\cose and 0.1 M fructose is separated by paper chromatography. If the Rf value of glu\cose is 0.4 and the Rf value of fructose is 0.6, what is the ratio of the concentrations of glu\cose and fructose in the solution?
A. 1:1
B. 2:1
Correct C. 3:2
D. 4:1

Correct Answer: C

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Question 19 View Details
A cell is placed in a solution containing 0.1 M glu\cose and 0.1 M fructose. If the cell is permeable to both glu\cose and fructose, what is the concentration of glu\cose in the cell after 1 hour?
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 20 View Details
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

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Question 21 View Details
In a typical human liver cell, the smooth \endoplasmic reticulum is primarily involved in the synthesis of which of the following?
A. Proteins
Correct B. Lipids
C. Carbohydrates
D. Nucleic acids

Correct Answer: B

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Question 22 View Details
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of which of the following?
A. ATP
B. NADPH
Correct C. Glu\cose
D. Oxygen

Correct Answer: C

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Question 23 View Details
The human nervous system is composed of two main types of nervous tissue: grey matter and white matter. Which of the following is a characteristic of grey matter?
A. It is composed of myelinated nerve fibers
Correct B. It is composed of unmyelinated nerve fibers
C. It is composed of glial cells
D. It is composed of blood vessels

Correct Answer: B

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Question 24 View Details
The process of digestion in the human body \begins in the mouth with the mechanical breakdown of food by the teeth and the chemical breakdown of food by which of the following?
Correct A. Saliva
B. Stomach acid
C. Pancreatic juice
D. Bile

Correct Answer: A

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Question 25 View Details
The human reproductive system is composed of two main types of reproductive organs: the male reproductive organs and the female reproductive organs. Which of the following is a characteristic of the male reproductive organs?
A. They are located inside the pelvic cavity
Correct B. They are located outside the pelvic cavity
C. They are composed of only one type of tissue
D. They are composed of two types of tissue

Correct Answer: B

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