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POST UTME LASU 2023 Biology | Objective

Are you preparing for POST UTME LASU 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 the context of cellular respiration, what is the primary function of the electron transport chain?

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2 during glycolysis

Correct C. To pump protons across the mitochondrial inner membrane

D. To reduce oxygen to water

Correct Answer: C

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Question 2

A 2-year-old child is brought to the pediatrician with a history of frequent urination and polydipsia. Physical examination reveals a palpable bladder and a normal blood pressure. Which of the following is the most likely diagnosis?

A. Diabetes mellitus

Correct B. Diabetes insipidus

C. Urinary tract infection

D. Bladder obstruction

Correct Answer: B

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Question 3

A diagram of the human eye is shown below. Which of the following structures is responsible for detecting light?

A. Cornea

B. Iris

Correct C. Retina

D. Optic nerve

Correct Answer: C

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Question 4

A 35-year-old woman presents to the emergency department with a 2-day history of severe headache, fever, and confusion. Physical examination reveals a stiff neck and a positive Kernig's sign. Which of the following is the most likely diagnosis?

Correct A. Meningitis

B. Encephalitis

C. Subarachnoid hemorrhage

D. Brain tumor

Correct Answer: A

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Question 5

A diagram of the human kidney is shown below. Which of the following structures is responsible for filtering the blood?

Correct A. Glomerulus

B. Proximal convoluted tubule

C. Distal convoluted tubule

D. Collecting duct

Correct Answer: A

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Question 6

In the context of respiration, what is the primary function of the mitochondria in the cell?

A. To synthesize ATP from glu\cose

Correct B. To break down glu\cose to release energy

C. To store energy in the form of glycogen

D. To transport oxygen to the cell

Correct Answer: B

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Question 7

A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?

A. Cornea

B. Iris

Correct C. Retina

D. Lens

Correct Answer: C

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Question 8

In the process of excretion, what is the primary function of the kidneys?

Correct A. To filter waste products from the blood

B. To regulate blood pressure

C. To maintain electrolyte balance

D. To produce hormones

Correct Answer: A

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Question 9

A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients?

A. Mouth

B. Stomach

Correct C. Small intestine

D. Large intestine

Correct Answer: C

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Question 10

In the context of eco\logy, what is the primary function of a producer in an e\cosystem?

A. To consume other organisms

Correct B. To produce their own food

C. To decompose organic matter

D. To regulate population growth

Correct Answer: B

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Question 11

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. U\sing the Hardy-Weinberg principle, calculate the frequency of the homozygous dominant genotype 'AA' in the population.

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.04

Correct Answer: A

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Question 12

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. 0.9

Correct Answer: B

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Question 13

A diagram of a human kidney is shown below. Identify the part labeled 'A'.

Correct A. Cortex

B. Medulla

C. Papilla

D. Calyx

Correct Answer: A

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Question 14

A diagram of a human eye is shown below. Identify the part labeled 'B'.

A. Cornea

Correct B. Iris

C. Lens

D. Retina

Correct Answer: B

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Question 15

A diagram of a human heart is shown below. Identify the part labeled 'C'.

A. Atrium

B. Ventricle

Correct C. Septum

D. Valve

Correct Answer: C

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Question 16

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 stages of mitosis is characterized by the alignment of the chromosomes at the metaphase plate?

A. Prophase

Correct B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: B

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Question 17

The hormone insulin is secreted by the \beta cells of the pancreas in response to high blood glu\cose levels. Which of the following effects of insulin is a result of its action on the liver?

A. Increased glu\cose production

B. Decreased glu\cose uptake

Correct C. Increased glycogen synthesis

D. Increased gluconeogenesis

Correct Answer: C

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Question 18

The process of asexual reproduction in which a new individual is produced from a bud or a fragment of the parent organism is called

A. Binary fission

Correct B. Budding

C. Fragmentation

D. Regeneration

Correct Answer: B

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Question 19

The xylem tissue in plants is responsible for the transport of water and minerals from the roots to the leaves. Which of the following types of cells is found in the xylem?

A. Parenchyma cells

B. Collenchyma cells

C. Sclerenchyma cells

Correct D. Tracheids

Correct Answer: D

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Question 20

The process of excretion in which waste products are removed from the body through the kidneys and excreted in the urine is called

A. Osmoregulation

B. Ureotelism

C. Uricotelism

Correct D. Nephron function

Correct Answer: D

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Question 21

The process of genetic recombination during meiosis results in the shuffling of genes between homo\logous chromosomes. What is the primary mechanism responsible for this shuffling?

Correct A. Cros\sing over

B. Indep\endent assortment

C. Gene mutation

D. Gene expression

Correct Answer: A

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Question 22

A patient is diagnosed with a rare genetic disorder caused by a point mutation in the DNA sequence. The mutation results in the substitution of a \single amino acid in a protein. What type of mutation is this?

A. Frameshift mutation

Correct B. Point mutation

C. Deletion mutation

D. Insertion mutation

Correct Answer: B

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Question 23

A microorganism is isolated from a patient's blood sample and identified as a Gram-positive bacterium. What is the primary characteristic of this bacterium?

Correct A. Thick peptidoglycan layer

B. Thin peptidoglycan layer

C. Presence of a capsule

D. Presence of flagella

Correct Answer: A

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Question 24

A population of birds is observed to have a high frequency of birds with a specific beak shape. What is the likely explanation for this phenomenon?

Correct A. Natural selection

B. Genetic drift

C. Gene flow

D. Mutation

Correct Answer: A

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Question 25

A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?

Correct A. Gas exchange

B. Air filtration

C. Mucus production

D. Cilia movement

Correct Answer: A

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