POST UTME REDEEMERS UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A scientist is studying the effect of pH on the growth of Escherichia coli. She observes that the bacteria grow best at a pH of 7.5. Which of the following enzymes is most likely responsible for this pH-dep\endent growth?
A. ATP synthase
B. Carbonic anhydrase
C. Lactate dehydrogenase
D. Pyruvate kinase
Question 2
In a population of rabbits, the average height is 20 cm with a s\tandard deviation of 2 cm. If a random sample of 10 rabbits is taken, what is the probability that the sample mean height will be greater than 22 cm?
A. 0.05
B. 0.10
C. 0.25
D. 0.50
Question 3
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
A. Exchange of oxygen and carbon dioxide
B. Regulation of body temperature
C. Maintenance of blood pressure
D. Production of red blood cells
Question 4
The human eye has a lens that changes shape to focus on objects at different dis\tances. What is the term for this type of lens?
A. Biconvex lens
B. Biconcave lens
C. Cylindrical lens
D. Variable lens
Question 5
A study on the genetics of height in humans found that the height of an individual is determined by the combination of two genes, one from each parent. If the height of the mother is 160 cm and the height of the father is 180 cm, what is the probability that their child will be taller than 170 cm?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 6
The cell cycle is the process by which a cell grows, replicates its DNA, and divides into two daughter cells. Which of the following stages of the cell cycle is responsible for DNA replication?
A. G1
B. S
C. G2
D. M
Question 7
The process of osmosis occurs when water molecules move from an area of high concentration to an area of low concentration through a selectively permeable membrane. What is the term for the movement of water molecules from a region of low solute concentration to a region of high solute concentration?
A. Osmosis
B. Diffusion
C. Active transport
D. Endosmosis
Question 8
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
B. Large population size
C. No mutation
D. No gene flow
Question 9
The human body has a unique system for transporting oxygen and nutrients to cells and removing waste products. Which of the following is a characteristic of the circulatory system?
A. It is composed of a network of blood vessels
B. It is composed of a network of lymph vessels
C. It is responsible for transporting oxygen and nutrients to cells
D. It is responsible for removing waste products from cells
Question 10
The xylem in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is composed of living cells
C. It has a high water content
D. It has a low water content
Question 11
A diagram of the human eye is shown below. Which part of the eye is responsible for adjusting the size of the pupil?
A. A
B. B
C. C
D. D
Question 12
The nervous system of the human body is responsible for transmitting and proces\sing information. Which of the following types of neurons is responsible for transmitting signals from sensory receptors to the central nervous system?
A. Sensory neurons
B. Motor neurons
C. Interneurons
D. Association neurons
Question 13
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the primary producers. Which of the following is a characteristic of these primary consumers?
A. They have a large body size
B. They have a short digestive tract
C. They have a high metabolic rate
D. They have a low reproductive rate
Question 14
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. Provides structural support
B. Regulates the movement of materials in and out of the cell
C. Involved in photosynthesis
D. Stores genetic information
Question 15
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Control of hunger and thirst
C. Maintenance of blood pressure
D. Regulation of hormone secretion

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