POST UTME CRAWFORD UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 cm long muscle fibre is stretched to 3.2 cm. What is the percentage increase in length?
A. 28%
B. 32%
C. 25%
D. 30%
Question 2
A cell is placed in a solution with a concentration of 0.1 M glu\cose. The cell is able to transport glu\cose into the cell u\sing facilitated diffusion. What is the concentration of glu\cose in the cell after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 3
The diagram below shows a cross-section of a xylem vessel. What is the function of the lignified cells labeled 'A'?
A. To provide structural support to the xylem vessel
B. To transport water and minerals from the roots to the leaves
C. To store food and nutrients in the xylem vessel
D. To regulate the rate of transpiration in the xylem vessel
Question 4
A diagram of a simple e\cosystem is shown below. What is the role of the structure labeled 'B'?
A. To produce organic matter.
B. To consume organic matter.
C. To decompose organic matter.
D. To regulate population growth.
Question 5
In a population of 1000 individuals, 80% are heterozygous for a particular gene, while 20% are homozygous recessive. If two individuals are randomly selected from this population, what is the probability that they will both be heterozygous?
A. 0.32
B. 0.48
C. 0.64
D. 0.80
Question 6
A bio\logist is studying the structure of a cell. The cell has a cell membrane, cytoplasm, and a nucleus. What is the function of the cell membrane?
A. To regulate the movement of materials in and out of the cell
B. To provide structural support to the cell
C. To store genetic information in the cell
D. To produce energy for the cell
Question 7
A patient is diagnosed with a bacterial infection. The bacteria are resis\tant to multiple antibiotics, including penicillin and ampicillin. Which of the following antibiotics is most likely to be effective?
A. Ciprofloxacin
B. Gentamicin
C. Vancomycin
D. Tetracycline
Question 8
In a typical human cell, the mitochondria are responsible for producing ATP through which process?
A. Photosynthesis
B. Respiration
C. Fermentation
D. Glycolysis
Question 9
A plant has the genotype 'AaBb'. What is the probability that the offspring will have the genotype 'AABB'?
A. 0.25
B. 0.5
C. 0.75
D. 0.33
Question 10
A 2.0 L solution of 0.5 M NaOH is prepared by dissolving 1.0 g of NaOH in 1000 mL of water. What is the concentration of the solution in molarity?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 11
A researcher is studying the effect of a new antibiotic on the growth of E. coli bacteria. The researcher observes that the bacteria are resis\tant to the antibiotic. Which of the following mechanisms is most likely responsible for the resis\tance?
A. The bacteria have developed a mutation in the antibiotic target protein.
B. The bacteria have produced an enzyme that inactivates the antibiotic.
C. The bacteria have developed a permeability barrier that prevents the antibiotic from entering the cell.
D. The bacteria have developed a mechanism to pump the antibiotic out of the cell.
Question 12
A geneticist is studying the inheri\tance of a trait in a population of pea plants. The trait is controlled by a \single gene with two alleles, one dominant and one recessive. If the genotype of the parent plant is 'Bb', what is the probability that the offspring will be homozygous recessive?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 13
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.36
B. 0.64
C. 0.16
D. 0.84
Question 14
The process by which an organism's genetic information is passed from one generation to the next is known as?
A. Mutation
B. Genetic drift
C. Natural selection
D. Heritability
Question 15
The process of meiosis in eukaryotic cells results in the production of four haploid daughter cells. Which of the following statements is true regarding the genetic variation introduced during meiosis?
A. Meiosis introduces genetic variation through the shuffling of alleles during cros\sing over.
B. Meiosis introduces genetic variation through the random assortment of chromosomes during gamete formation.
C. Meiosis introduces genetic variation through the mutation of alleles during DNA replication.
D. Meiosis introduces genetic variation through the recombination of genes during the prophase I stage.

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