POST UTME NOUN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A DNA molecule consists of two complementary strands of nucleotides. If the sequence of one strand is ATCG, what is the sequence of the complementary strand?
A. TAGC
B. TCGA
C. TGCA
D. TGAC
Question 2
A researcher is studying the effect of temperature on the rate of enzyme-catalyzed reactions. Which of the following statements best describes the relationship between temperature and enzyme activity?
A. Enzyme activity increases with increa\sing temperature.
B. Enzyme activity decreases with increa\sing temperature.
C. Enzyme activity remains cons\tant with increa\sing temperature.
D. Enzyme activity increases with decrea\sing temperature.
Question 3
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Site of protein synthesis
B. Site of lipid synthesis
C. Site of carbohydrate synthesis
D. Site of nucleic acid synthesis
Question 4
In asexual reproduction, what is the term for the process by which a \single cell divides to produce two daughter cells?
A. Mitosis
B. Meiosis
C. Binary Fission
D. Budding
Question 5
A diagram of the human excretory system is shown below. What is the primary function of the kidneys?
A. Production of urine
B. Regulation of blood pressure
C. Maintenance of electrolyte balance
D. Storage of waste
Question 6
A plant cell has a cell wall made of cellulose, a plasma membrane, and a large central vacuole. What is the primary function of the cell wall?
A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To produce ATP through photosynthesis
D. To store water and nutrients
Question 7
A plant has a root system that consists of a taproot and several lateral roots. What is the primary function of the taproot?
A. To anchor the plant in the soil
B. To absorb water and nutrients from the soil
C. To store food and nutrients for the plant
D. To produce flowers and seeds
Question 8
A population of 1000 rabbits is introduced to an island with an initial population of 500 rabbits. The population of rabbits on the island grows according to the \logistic growth model, where the growth rate is 0.2 and the carrying capacity is 2000. What is the population of rabbits on the island after 5 years?
A. 1500
B. 2000
C. 2500
D. 3000
Question 9
A study on the effects of light intensity on photosynthesis in a aquatic plant species revealed that the rate of photosynthesis increased by 25% when light intensity was doubled. However, when light intensity was quadrupled, the rate of photosynthesis increased by only 10%. Which of the following best explains this observation?
A. The plant species has a high affinity for light energy, but is limited by its ability to absorb CO2.
B. The plant species has a low affinity for light energy, but is able to increase its rate of photosynthesis by increa\sing its stomatal density.
C. The plant species has a high affinity for light energy, but is limited by its ability to produce ATP.
D. The plant species has a low affinity for light energy, but is able to increase its rate of photosynthesis by increa\sing its chlorophyll content.
Question 10
In a population of 1000 individuals, 20% are homozygous dominant for the gene controlling flower color, 40% are heterozygous, and the remaining 40% are homozygous recessive. If the population is randomly mated, what is the probability that a randomly selected individual will be homozygous dominant for the gene controlling flower color?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 11
A patient is diagnosed with a bacterial infection. Which of the following is a characteristic of the bacterial cell wall?
A. Presence of a nucleus
B. Presence of a cell wall
C. Presence of flagella
D. Presence of mitochondria
Question 12
In a cell undergoing mitosis, what is the stage at which the chromosomes are most condensed and visible under a microscope?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 13
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. If the plant requires a temperature of 20°C and a relative humidity of 80% to grow optimally, what will happen to the plant?
A. The plant will grow optimally.
B. The plant will grow slowly.
C. The plant will not grow at all.
D. The plant will die.
Question 14
A cell is placed in a solution with a pH of 5. If the cell membrane is permeable to hydrogen ions, what will happen to the cell?
A. The cell will swell and eventually burst due to the influx of hydrogen ions.
B. The cell will shrink and lose water due to the efflux of hydrogen ions.
C. The cell will remain unchanged as the hydrogen ions will not affect the cell membrane.
D. The cell will undergo a process of osmoregulation to maintain its internal pH.
Question 15
In a plant, the process of growth and development involves the production of new cells and tissues. Which of the following is a type of growth that occurs in plants?
A. Meristematic growth
B. Determinate growth
C. Indeterminate growth
D. Secondary growth

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