POST UTME AL-HIKMAH UNIVERSITY 2023 Biology | Objective

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Question 1
The process by which the nervous system coordinates the contraction and relaxation of muscles to produce movement is known as
A. Reflex Action
B. Muscle Tone
Correct C. Motor Control
D. Proprioception

Correct Answer: C

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Question 2
In a eukaryotic cell, the region of the nucleus where DNA replication occurs is known as the
A. Nucleoplasm
B. Nuclear Matrix
Correct C. Nucleolus
D. Chromatin

Correct Answer: C

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Question 3
The process by which plants transport water and minerals from the roots to the leaves is known as
A. Transpiration
Correct B. Translocation
C. Osmosis
D. Diffusion

Correct Answer: B

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Question 4
The sense organ responsible for detecting changes in sound pressure is known as the
A. Eye
Correct B. Ear
C. Nose
D. Mouth

Correct Answer: B

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Question 5
The process by which the body maintains a stable internal environment despite changes in the external environment is known as
Correct A. Homeostasis
B. Regulation
C. Control
D. Equilibrium

Correct Answer: A

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Question 6
In a study on the genetic basis of antibiotic resis\tance in bacteria, researchers isolated a strain of E. coli that exhibited high-level resis\tance to ampicillin. The researchers sequenced the bacterial genome and identified a point mutation in the gene encoding the \beta-lactamase enzyme, which is responsible for conferring resis\tance to ampicillin. The mutation resulted in a change from glutamic acid to valine at position 240 of the enzyme. What is the likely effect of this mutation on the enzyme's activity?
Correct A. The mutation will increase the enzyme's activity, leading to increased resis\tance to ampicillin.
B. The mutation will decrease the enzyme's activity, leading to decreased resis\tance to ampicillin.
C. The mutation will have no effect on the enzyme's activity.
D. The mutation will alter the enzyme's substrate specificity, leading to increased resis\tance to other antibiotics.

Correct Answer: A

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Question 7
A researcher is studying the effects of temperature on the growth rate of a microorganism. The researcher measures the growth rate at different temperatures and plots the data on a graph. What is the likely shape of the graph?
A. A straight line with a positive slope.
Correct B. A curve with a maximum point.
C. A curve with a minimum point.
D. A straight line with a negative slope.

Correct Answer: B

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Question 8
A patient is diagnosed with a genetic disorder that affects the production of a specific enzyme. The patient's enzyme activity is measured and found to be 20% of the normal value. What is the likely effect of this enzyme deficiency on the patient's metabolism?
Correct A. The patient's metabolism will be slowed down, leading to decreased energy production.
B. The patient's metabolism will be accelerated, leading to increased energy production.
C. The patient's metabolism will be unaffected.
D. The patient's metabolism will be affected, but the effect will be unpredictable.

Correct Answer: A

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Question 9
A researcher is studying the effects of a specific gene on the development of a particular organ. The researcher uses a technique called RNA interference (RNAi) to knock down the expression of the gene. What is the likely effect of this treatment on the organ's development?
A. The organ's development will be accelerated, leading to an increase in size.
Correct B. The organ's development will be slowed down, leading to a decrease in size.
C. The organ's development will be unaffected.
D. The organ's development will be affected, but the effect will be unpredictable.

Correct Answer: B

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Question 10
A patient is diagnosed with a disease that affects the functioning of the respiratory system. The patient's lung function is measured and found to be 50% of the normal value. What is the likely effect of this lung function on the patient's oxygen levels?
Correct A. The patient's oxygen levels will decrease, leading to hypoxia.
B. The patient's oxygen levels will increase, leading to hyperoxia.
C. The patient's oxygen levels will remain unaffected.
D. The patient's oxygen levels will be affected, but the effect will be unpredictable.

Correct Answer: A

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Question 11
The process by which a virus replicates itself within a host cell is known as:
A. Transcription
B. Translation
C. Replication
Correct D. Transduction

Correct Answer: D

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Question 12
The diagram below represents a cross-section of a plant root. Identify the part labeled 'A':
A. Epidermis
B. Cortex
Correct C. Endodermis
D. Steles

Correct Answer: C

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Question 13
The genetic code is a set of rules that translates nucleotide sequences into:
Correct A. Proteins
B. DNA
C. RNA
D. Enzymes

Correct Answer: A

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Question 14
The diagram below represents a simple harmonic motion. Identify the part labeled 'B':
A. Amplitude
Correct B. Frequency
C. Period
D. Displacement

Correct Answer: B

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Question 15
The process by which an organism's genetic information is passed from one generation to the next is known as:
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 16
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 17
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'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 18
A solution of glu\cose (C6H12O6) has a concentration of 0.2 M. What is the molarity of the solution if 10 mL of the solution is diluted to 50 mL?
A. 0.04 M
Correct B. 0.08 M
C. 0.12 M
D. 0.16 M

Correct Answer: B

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Question 19
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 20
A diagram of a simple circuit is shown below. Identify the part labeled 'B'.
A. Resistor
Correct B. Capacitor
C. Inductor
D. Battery

Correct Answer: B

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Question 21
In a eukaryotic cell, the process of mitosis involves the division of the nucleus into two daughter nuclei, each containing the same number and type of chromosomes as the parent nucleus. Which of the following stages of mitosis is characterized by the condensation of chromosomes and the formation of the metaphase plate?
A. Prophase
Correct B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: B

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Question 22
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of photosynthesis?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 23
In the human circulatory system, the heart pumps blood through a network of blood vessels, including arteries, veins, and capillaries. Which of the following is a function of the capillaries?
A. To carry oxygenated blood from the lungs to the heart
B. To carry deoxygenated blood from the heart to the lungs
Correct C. To exchange oxygen and carbon dioxide between the blood and tissues
D. To regulate blood pressure

Correct Answer: C

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Question 24
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins into amino acids?
A. Amylase
B. Lipase
Correct C. Tryp\sin
D. Lactase

Correct Answer: C

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Question 25
The process of reproduction in plants involves the production of seeds, which contain the genetic material necessary for the development of a new plant. Which of the following is a characteristic of seeds?
A. They are produced by animals
Correct B. They contain the genetic material necessary for the development of a new plant
C. They are produced by fungi
D. They are produced by bacteria

Correct Answer: B

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