Practice Post UTME RHEMA UNIVERSITY biology 2018 Past Questions

Question 1

In a population of 1000 individuals, 70% are homozygous dominant (BB), 20% are heterozygous (Bb), and 10% are homozygous recessive (bb). What is the frequency of the recessive allele (b)?

Correct A. 0.1

B. 0.2

C. 0.3

D. 0.4

Correct Answer: A

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Question 2

A diagram of a plant cell is shown below. What is the function of the cell wall?

Correct A. Provides structural support

B. Regulates the movement of materials in and out of the cell

C. Produces proteins

D. Stores genetic information

Correct Answer: A

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Question 3

A 5.0 L flask contains 2.5 mol of an ideal gas at a temperature of 300 K. What is the pressure of the gas?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 4

A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?

Correct A. 2.0 cm

B. 3.0 cm

C. 4.0 cm

D. 5.0 cm

Correct Answer: A

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Question 5

A 2.0 L flask contains 1.0 mol of an ideal gas at a temperature of 400 K. What is the volume of the gas at a temperature of 200 K?

Correct A. 1.0 L

B. 1.5 L

C. 2.0 L

D. 2.5 L

Correct Answer: A

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Question 6

In the context of evolutionary theory, what is the primary mechanism by which genetic drift occurs?

A. Natural selection

B. Genetic mutation

C. Gene flow

Correct D. Random sampling of alleles

Correct Answer: D

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Question 7

A plant cell has a concentration of 0.1 M glu\cose in the cytosol. If the cell is placed in a 0.5 M glu\cose solution, what is the new concentration of glu\cose in the cytosol after 10 minutes?

A. 0.2 M

B. 0.3 M

Correct C. 0.4 M

D. 0.5 M

Correct Answer: C

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Question 8

A 2-year-old child is brought to the doctor with a history of frequent infections. The child's mother reports that the child has been taking antibiotics for the past 6 months. What is the most likely cause of the child's condition?

A. Genetic mutation

B. Environmental factor

Correct C. Imbalanced gut microbiome

D. Viral infection

Correct Answer: C

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Question 9

A researcher is studying the effect of light on plant growth. The researcher sets up an experiment with three different light intensities: 100 μmol/m²s, 200 μmol/m²s, and 300 μmol/m²s. What is the expected effect of the light intensity on plant growth?

Correct A. Increased growth rate

B. Decreased growth rate

C. No effect on growth rate

D. Increased photosynthesis

Correct Answer: A

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Question 10

A 30-year-old woman is experiencing symptoms of depression. Her doctor prescribes her a medication that affects the neurotransmitter serotonin. What is the primary mechanism by which this medication works?

Correct A. Inhibiting the reuptake of serotonin

B. Increa\sing the release of serotonin

C. Blocking the action of serotonin

D. Increa\sing the synthesis of serotonin

Correct Answer: A

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Question 11

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

Correct A. Active transport of ions across the renal tubules

B. Passive diffusion of ions across the renal tubules

C. Excretion of excess ions through the urine

D. Reabsorption of ions from the filtrate

Correct Answer: A

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Question 12

What is the primary function of the xylem in plants?

Correct A. Transport of water and minerals from the roots to the leaves

B. Transport of sugars and amino acids from the leaves to the roots

C. Support and structure for the plant

D. Storage of food and water

Correct Answer: A

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Question 13

What is the term for the process by which microorganisms break down organic matter in the absence of oxygen?

A. Fermentation

B. Respiration

Correct C. Decomposition

D. Putrefaction

Correct Answer: C

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Question 14

What is the primary mechanism by which the body regulates blood pressure?

Correct A. Active transport of ions across the renal tubules

B. Passive diffusion of ions across the renal tubules

C. Excretion of excess ions through the urine

D. Reabsorption of ions from the filtrate

Correct Answer: A

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Question 15

What is the term for the process by which the body regulates the concentration of ions in the blood?

Correct A. Osmoregulation

B. Regulation of blood pressure

C. Regulation of body temperature

D. Regulation of blood sugar levels

Correct Answer: A

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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 homozygous dominant genotype 'AA'?

Correct A. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 17

A plant with a mutation in the R gene has a flower color of red. If the plant is crossed with a plant with a mutation in the r gene, what is the probability that the offspring will have a flower color of red?

Correct A. 0.5

B. 0.25

C. 0.75

D. 0.33

Correct Answer: A

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Question 18

In a human population, the frequency of the recessive allele 'a' is 0.1. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?

Correct A. 0.01

B. 0.09

C. 0.19

D. 0.21

Correct Answer: A

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Question 19

A plant with a mutation in the R gene has a flower color of red. If the plant is crossed with a plant with a mutation in the r gene, what is the probability that the offspring will have a flower color of red?

Correct A. 0.5

B. 0.25

C. 0.75

D. 0.33

Correct Answer: A

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Question 20

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. 0.04

Correct Answer: A

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Question 21

In the context of photosynthesis, what is the primary function of the thylakoid membrane in the chloroplast?

Correct A. To absorb light energy

B. To synthesize glu\cose

C. To transport electrons

D. To regulate stomatal opening

Correct Answer: A

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Question 22

A population of Drosophila melanogaster is being studied for its adaptation to a changing environment. Which of the following evolutionary mechanisms is most likely responsible for the observed changes?

Correct A. Natural selection

B. Genetic drift

C. Gene flow

D. Mutation

Correct Answer: A

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Question 23

The human body is composed of four main types of tissues: epithelial, connective, muscle, and nervous. Which of the following is a characteristic of epithelial tissue?

A. It is found in the dermis layer of the skin

Correct B. It forms glands and ducts

C. It is composed of muscle fibers

D. It is found in the bone marrow

Correct Answer: B

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Question 24

The nervous system is responsible for transmitting signals between different parts of the body. Which of the following is a type of synapse?

A. D\endro-d\endritic synapse

Correct B. Axo-d\endritic synapse

C. Axo-axonic synapse

D. Electrical synapse

Correct Answer: B

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Question 25

The sense organ responsible for detecting sound waves is the?

Correct A. Ear

B. Eye

C. Nose

D. Tongue

Correct Answer: A

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