Practice post utme skyline university biology 2017 Past Questions

Question 1

In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst and hunger?

A. To regulate body temperature

B. To control blood pressure

Correct C. To regulate thirst and hunger

D. To stimulate digestion

Correct Answer: C

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Question 2

A diagram of the human kidney is shown below. Which part of the kidney is responsible for filtering waste products from the blood?

Correct A. Glomerulus

B. Proximal convoluted tubule

C. Distal convoluted tubule

D. Collecting duct

Correct Answer: A

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Question 3

In the context of growth and regulation, what is the primary function of the pituitary gland?

A. To regulate body temperature

B. To control blood pressure

Correct C. To regulate growth and development

D. To stimulate digestion

Correct Answer: C

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Question 4

A diagram of the human nervous system is shown below. Which part of the nervous system is responsible for transmitting signals from sensory receptors to the brain?

A. Somatic nervous system

B. Autonomic nervous system

C. Enteric nervous system

Correct D. Peripheral nervous system

Correct Answer: D

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Question 5

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

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

D. To compete with other species for resources

Correct Answer: C

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Question 6

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 recessive genotype 'aa'?

Correct A. 0.04

B. 0.08

C. 0.16

D. 0.24

Correct Answer: A

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Question 7

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of the gas is removed, what is the new pressure of the gas?

A. 1.5 atm

Correct B. 2.0 atm

C. 2.5 atm

D. 3.0 atm

Correct Answer: B

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Question 8

A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what is the concentration of sucrose in the cytosol?

A. 0.25 M

B. 0.5 M

Correct C. 0.75 M

D. 1.0 M

Correct Answer: C

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Question 9

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

Correct D. C2H6

Correct Answer: D

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Question 10

A solution contains 0.1 M NaCl and 0.2 M glu\cose. What is the total concentration of solutes in the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 11

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 12

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

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 13

A diagram shows a plant with the following characteristics: leaves are alternate, stems are herbaceous, and flowers are in clusters. What is the most likely classification of this plant?

A. Dicotyledon

Correct B. Monocotyledon

C. Gymnosperm

D. Angiosperm

Correct Answer: B

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Question 14

A diagram shows a human lung with the following characteristics: alveoli are small, air sacs are numerous, and blood vessels are thin. What is the most likely function of this organ?

Correct A. Respiration

B. Circulation

C. Digestion

D. Excretion

Correct Answer: A

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Question 15

A diagram shows a human eye with the following characteristics: lens is convex, retina is at the back, and pupil is circular. What is the most likely classification of this sense organ?

Correct A. Photoreceptor

B. Chemoreceptor

C. Thermoreceptor

D. Mechanoreceptor

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. 0.4

B. 0.6

C. 0.8

D. 0.2

Correct Answer: A

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Question 17

A 5% solution of glu\cose in water has a concentration of 5 g per 100 mL. What is the concentration of a 250 mL solution of this glu\cose solution?

A. 10 g

Correct B. 12.5 g

C. 15 g

D. 20 g

Correct Answer: B

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Question 18

A plant has a photosynthetic rate of 10 mg CO2 per hour. If the plant is exposed to light for 8 hours, what is the total amount of CO2 fixed?

A. 40 mg

B. 60 mg

Correct C. 80 mg

D. 100 mg

Correct Answer: C

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Question 19

A 2.5 L solution of a 0.5 M NaCl solution contains 1.25 g of NaCl. What is the molarity of a 1 L solution of this NaCl solution?

A. 0.5 M

Correct B. 1 M

C. 1.5 M

D. 2 M

Correct Answer: B

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Question 20

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

Correct C. 10

D. 20

Correct Answer: C

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Question 21

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

A. Plastocyanin

B. Ferredoxin

Correct C. Pheophytin

D. ATP

Correct Answer: C

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Question 22

A researcher studying the effects of pollution on a freshwater e\cosystem observes that the concentration of dissolved oxygen in the water decreases as the concentration of pollu\tants increases. Which of the following best explains this observation?

A. The increased concentration of pollu\tants leads to an increase in the rate of respiration among aquatic organisms.

Correct B. The increased concentration of pollu\tants leads to a decrease in the rate of photosynthesis among aquatic plants.

C. The increased concentration of pollu\tants leads to an increase in the rate of decomposition among organic matter.

D. The increased concentration of pollu\tants leads to a decrease in the rate of diffusion of oxygen into the water.

Correct Answer: B

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Question 23

A cell is placed in a hypertonic solution. Which of the following best describes the movement of water into the cell?

Correct A. Osmosis

B. Diffusion

C. Active transport

D. Passive transport

Correct Answer: A

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Question 24

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?

Correct 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.

Correct Answer: A

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Question 25

A researcher is studying the effects of climate change on a particular e\cosystem. Which of the following would be the most appropriate method for collecting data on the impact of climate change on the e\cosystem?

A. Conducting a survey of the e\cosystem to determine the types and abundance of species present.

Correct B. Collecting data on the temperature and precipitation patterns in the e\cosystem over a period of time.

C. Conducting experiments to determine the effects of different climate change scenarios on the e\cosystem.

D. Analyzing satellite images of the e\cosystem to determine changes in land use and land cover.

Correct Answer: B

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