Practice post utme skyline university biology 2017 Past Questions

Question 1

A patient with a history of kidney disease is prescribed a medication that increases the excretion of potassium in the urine. Which of the following is a potential side effect of this medication?

A. Hypokalemia

B. Hyperkalemia

C. Hypocalcemia

D. Hypercalcemia

Question 2

A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?

A. To synthesize proteins

B. To store genetic information

C. To regulate the cell's metabolic processes

D. To maintain the cell's shape

Question 3

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'?

A. 0.64

B. 0.36

C. 0.16

D. 0.04

Question 4

A patient with a history of kidney stones is prescribed a medication that inhibits the reabsorption of calcium in the kidneys. Which of the following is a potential side effect of this medication?

A. Hypocalcemia

B. Hypercalcemia

C. Hypokalemia

D. Hyperkalemia

Question 5

In the context of osmoregulation, what is the primary function of the hormone vasopres\sin in the kidneys?

A. To increase water reabsorption in the collecting ducts

B. To decrease water reabsorption in the proximal convoluted tubules

C. To increase sodium reabsorption in the distal convoluted tubules

D. To decrease potassium excretion in the loop of Henle

Question 6

In the context of eco\logy, what is the primary function of a keystone species?

A. To regulate the population of other species

B. To provide food for other species

C. To modify the environment in a way that benefits other species

D. To compete with other species for resources

Question 7

A 50-g sample of a compound containing only carbon and hydrogen is burned in oxygen to produce 11.2 L of CO2 and 6.8 L of H2O at 25°C and 1 atm. What is the empirical formula of the compound?

A. CH2

B. CH3

C. C2H4

D. C2H6

Question 8

In a food chain, what is the primary role of producers such as plants and algae?

A. To consume other organisms and obtain energy

B. To produce their own food through photosynthesis

C. To decompose dead organisms and recycle nutrients

D. To form symbiotic relationships with other organisms

Question 9

In a photosynthetic pathway, which of the following is the primary acceptor of electrons in the light-dep\endent reactions?

A. Plastocyanin

B. Ferredoxin

C. Pheophytin

D. ATP

Question 10

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'?

A. 0.4

B. 0.6

C. 0.8

D. 0.2

Question 11

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?

A. 0.25

B. 0.5

C. 0.75

D. 0.9

Question 12

In a diploid cell, what is the ratio of heterozygous to homozygous genotypes for a \single gene locus?

A. 1:1

B. 2:1

C. 3:1

D. 4:1

Question 13

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 rr?

A. 0.25

B. 0.5

C. 0.75

D. 1

Question 14

A cell has a volume of 10 μL and a surface area of 100 μm^2. What is the surface-to-volume ratio?

A. 1

B. 5

C. 10

D. 20

Question 15

A population of rabbits is introduced to a new habitat. The population grows rapidly at first, but then slows down and eventually levels off. Which of the following best explains this pattern of growth?

A. The population is limited by the availability of food.

B. The population is limited by the availability of space.

C. The population is limited by the availability of water.

D. The population is limited by the availability of shelter.

POST UTME SKYLINE UNIVERSITY 2017 Biology | Objective

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