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POST UTME BABCOCK UNIVERSITY 2019 Biology | Objective

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Question 1 View Details

In the process of osmoregulation, what is the primary mechanism by which the kidney regulates the concentration of ions in the blood?

Correct A. Reabsorption of ions in the proximal convoluted tubule

B. Secretion of ions in the distal convoluted tubule

C. Reabsorption of ions in the loop of Henle

D. Excretion of ions in the collecting duct

Correct Answer: A

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Question 2 View Details

What is the primary function of the Golgi apparatus in a cell?

A. Protein synthesis

Correct B. Modification and packaging of proteins

C. Cell signaling

D. Cell division

Correct Answer: B

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Question 3 View Details

In the context of genetics, what is the term for the process by which a gene is turned on or off?

A. Gene expression

Correct B. Gene regulation

C. Gene mutation

D. Gene deletion

Correct Answer: B

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Question 4 View Details

What is the primary function of the xylem in a plant?

Correct A. Transport of water and minerals

B. Transport of sugars and amino acids

C. Cell signaling

D. Cell division

Correct Answer: A

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Question 5 View Details

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

Correct A. Antibiotic resis\tance

B. Antibiotic sensitivity

C. Bacterial mutation

D. Viral infection

Correct Answer: A

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Question 6 View Details

In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6 and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the homozygous dominant genotype (AA)?

Correct A. 0.36

B. 0.48

C. 0.52

D. 0.64

Correct Answer: A

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Question 7 View Details

A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1

Correct Answer: A

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Question 8 View Details

A cell is placed in a solution with a pH of 5.5. What is the concentration of hydrogen ions in the solution?

Correct A. 10^{-5.5}

B. 10^{-6.5}

C. 10^{-7.5}

D. 10^{-8.5}

Correct Answer: A

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Question 9 View Details

A diagram shows a plant with a root system and a shoot system. Which part of the plant is responsible for photosynthesis?

Correct A. A

B. B

C. C

D. D

Correct Answer: A

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Question 10 View Details

A diagram shows a cell with a nucleus and a mitochondria. Which part of the cell is responsible for protein synthesis?

A. A

B. B

Correct C. C

D. D

Correct Answer: C

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Question 11 View Details

In the context of tissue organization, what is the primary function of the basement membrane?

A. To provide structural support to cells

B. To facilitate cell-to-cell communication

C. To regulate the movement of ions and molecules

Correct D. To maintain tissue homeostasis

Correct Answer: D

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Question 12 View Details

A 20-year-old male presents with symptoms of respiratory distress. His arterial blood gas (ABG) shows a pH of 7.35, PCO2 of 40 mmHg, and PO2 of 80 mmHg. What is the primary cause of his respiratory acidosis?

A. Hyperventilation

Correct B. Hypoventilation

C. Asthma

D. Pneumonia

Correct Answer: B

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Question 13 View Details

A researcher is studying the effects of light on plant growth. She uses a controlled environment chamber to simulate different light intensities. What type of experiment is she conducting?

A. Causal

B. Correlational

Correct C. Experimental

D. Descriptive

Correct Answer: C

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Question 14 View Details

A bio\logist is studying the classification of living organisms. She uses the following key to identify a species:

Correct A. Kingdom: Animalia, Phylum: Chordata, Class: Mammalia, Order: Carnivora

B. Kingdom: Plantae, Phylum: Magnoliophyta, Class: Magnoliopsida, Order: Rosales

C. Kingdom: Fungi, Phylum: Ascomycota, Class: Dothideomycetes, Order: Capnodiales

D. Kingdom: Protista, Phylum: Ciliophora, Class: Ciliata, Order: Litostomatea

Correct Answer: A

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Question 15 View Details

A 30-year-old female presents with symptoms of fatigue, weakness, and shortness of breath. Her complete blood count (CBC) shows a hemoglobin level of 8 g/dL. What is the primary cause of her anemia?

Correct A. Iron deficiency

B. Vitamin B12 deficiency

C. Folate deficiency

D. Sickle cell disease

Correct Answer: A

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Question 16 View Details

In a plant cell, the process of photosynthesis occurs in the chloroplasts, where light energy is converted into chemical energy. Which of the following is a key component of the light-dep\endent reactions?

A. ATP

Correct B. NADPH

C. Water

D. Light-Indep\endent Reactions

Correct Answer: B

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Question 17 View Details

The xylem and phloem are two types of vascular tissues found in plants. Which of the following is a characteristic of the xylem?

Correct A. Transports water and minerals from roots to leaves

B. Transports sugars and other organic compounds from leaves to roots

C. Supports the structure of the plant

D. Regulates the plant's water balance

Correct Answer: A

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Question 18 View Details

The human body's nervous system is responsible for controlling and coordinating the body's functions. Which of the following is a type of neuron?

Correct A. Motor neuron

B. Sensory neuron

C. Interneuron

D. Glial cell

Correct Answer: A

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Question 19 View Details

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?

A. Amylase

B. Lipase

Correct C. Tryp\sin

D. Lactase

Correct Answer: C

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Question 20 View Details

The human body's respiratory system is responsible for exchanging oxygen and carbon dioxide through the process of breathing. Which of the following is a characteristic of the alveoli?

A. Small, grape-like structures

B. Large, balloon-like structures

Correct C. Thin-walled, gas-exchange structures

D. Thick-walled, blood-storage structures

Correct Answer: C

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Question 21 View Details

In a population of 1000 individuals, 70% are homozygous dominant (BB), 20% are heterozygous (Bb), and 10% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have a child with the BB genotype?

Correct A. 0.25

B. 0.5

C. 0.75

D. 0.9

Correct Answer: A

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Question 22 View Details

A scientist is studying the effect of pH on the growth of a certain type of bacteria. The bacteria grow best at a pH of 7.0, but the optimal pH for growth is between 6.5 and 7.5. If the pH of the growth medium is 6.0, what can the scientist expect to happen to the bacteria?

A. The bacteria will grow at a rate similar to that at pH 7.0.

Correct B. The bacteria will grow at a slower rate than at pH 7.0.

C. The bacteria will not grow at all.

D. The bacteria will grow at a faster rate than at pH 7.0.

Correct Answer: B

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Question 23 View Details

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 transport materials throughout the cell.

D. To provide structural support to the cell.

Correct Answer: B

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Question 24 View Details

A diagram of a simple circuit is shown below. What is the function of the resistor labeled 'R1'?

Correct A. To reduce the voltage across the circuit.

B. To increase the current through the circuit.

C. To decrease the resis\tance in the circuit.

D. To provide a path for the current to flow.

Correct Answer: A

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Question 25 View Details

A diagram of a simple microscope is shown below. What is the function of the objective lens?

Correct A. To magnify the image of the object.

B. To reduce the size of the image of the object.

C. To change the color of the image of the object.

D. To provide a path for the light to enter the microscope.

Correct Answer: A

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