Practice post utme greenfield university biology 2025 Past Questions

Question 1

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. 0.16

B. 0.36

C. 0.64

D. 0.84

Correct Answer: A

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Question 2

A plant cell has a vacuole that is 10 μm in diameter. If the cell membrane is 1 μm thick, what is the total dis\tance across the cell membrane and the vacuole?

A. 12 μm

Correct B. 14 μm

C. 16 μm

D. 18 μm

Correct Answer: B

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Question 3

A solution of 0.1 M glu\cose is diluted to 0.01 M. What is the ratio of the initial volume to the final volume?

A. 1:10

Correct B. 1:100

C. 10:1

D. 100:1

Correct Answer: B

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Question 4

A population of 1000 bacteria is growing exponentially with a doubling time of 1 hour. How many bacteria will there be after 3 hours?

A. 2000

Correct B. 4000

C. 6000

D. 8000

Correct Answer: B

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Question 5

A plant has a root system that is 5 cm long and a stem that is 10 cm long. What is the ratio of the root length to the stem length?

Correct A. 1:2

B. 1:5

C. 2:1

D. 5:1

Correct Answer: A

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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 dominant genotype 'AA'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.88

Correct Answer: A

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Question 7

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

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 8

A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 9

A 10.0 g sample of a compound is found to have a mass of 5.0 g after being dried in an oven at 105°C. What is the percentage of water in the compound?

A. 20%

B. 30%

Correct C. 40%

D. 50%

Correct Answer: C

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Question 10

A 5.0 L sample of a gas is collected over water at a temperature of 25°C and a pressure of 1.0 atm. If the vapor pressure of water at 25°C is 0.031 atm, what is the partial pressure of the gas?

A. 0.969 atm

B. 0.979 atm

Correct C. 0.989 atm

D. 0.999 atm

Correct Answer: C

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Question 11

The process of cellular respiration in eukaryotic cells involves the breakdown of glu\cose to produce ATP, which is then used to power the cell's various activities. Which of the following statements best describes the relationship between the electron transport chain and the production of ATP?

Correct A. The electron transport chain generates a proton gradient across the mitochondrial inner membrane, which drives the production of ATP.

B. The electron transport chain is responsible for the breakdown of glu\cose to produce ATP.

C. The electron transport chain is a byproduct of ATP production and has no direct role in its synthesis.

D. The electron transport chain is involved in the production of NADH and FADH2, but not in the production of ATP.

Correct Answer: A

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Question 12

In the context of plant growth and development, what is the primary function of auxins?

A. Auxins are involved in the regulation of stomatal opening and clo\sing.

Correct B. Auxins promote cell elongation and cell division, leading to increased plant growth.

C. Auxins are responsible for the production of ethylene, a plant hormone involved in fruit ripening.

D. Auxins inhibit the production of gibberellins, which are involved in seed germination.

Correct Answer: B

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Question 13

The human eye has a unique structure that allows it to detect a wide range of light intensities. Which of the following statements best describes the role of the pupil in this process?

A. The pupil is responsible for focu\sing light onto the retina.

Correct B. The pupil regulates the amount of light entering the eye, allowing the eye to adapt to changing light conditions.

C. The pupil is involved in the production of tears, which help to lubricate the eye.

D. The pupil is responsible for the movement of the eye, allowing it to track objects.

Correct Answer: B

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Question 14

In the context of cellular bio\logy, what is the primary function of the \endoplasmic reticulum?

A. The \endoplasmic reticulum is responsible for the breakdown of proteins.

Correct B. The \endoplasmic reticulum is involved in protein synthesis and lipid synthesis.

C. The \endoplasmic reticulum is responsible for the movement of materials within the cell.

D. The \endoplasmic reticulum is involved in the production of ATP.

Correct Answer: B

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Question 15

The human body has a complex system for regulating body temperature. Which of the following statements best describes the role of the hypothalamus in this process?

A. The hypothalamus is responsible for the production of hormones that regulate body temperature.

Correct B. The hypothalamus regulates body temperature through sweating and shivering.

C. The hypothalamus is involved in the regulation of appetite and satiety.

D. The hypothalamus is responsible for the movement of the body's limbs.

Correct Answer: B

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Question 16

In a population of E. coli, the frequency of the gene for ampicillin resis\tance is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many are expected to be resis\tant?

A. 0

B. 2

Correct C. 200

D. 2000

Correct Answer: C

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Question 17

A 25-year-old woman presents with a 2-year history of amenorrhea. Her serum FSH level is elevated, and her pelvic examination is normal. What is the most likely diagnosis?

Correct A. Premature ovarian failure

B. Polycystic ovary syndrome

C. Hypothalamic amenorrhea

D. Pituitary tumor

Correct Answer: A

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Question 18

A 35-year-old man presents with a 6-month history of erectile dysfunction. His serum testosterone level is normal, and his pelvic examination is normal. What is the most likely diagnosis?

A. Diabetes mellitus

B. Hypertension

C. Medication side effect

Correct D. Psychogenic erectile dysfunction

Correct Answer: D

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Question 19

A 28-year-old woman presents with a 3-year history of infertility. Her serum FSH level is normal, and her pelvic examination is normal. What is the most likely diagnosis?

Correct A. Tubal blockage

B. Ovulatory dysfunction

C. Endometriosis

D. Uterine factor

Correct Answer: A

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Question 20

A 40-year-old man presents with a 5-year history of hypertension. His serum creatinine level is elevated, and his pelvic examination is normal. What is the most likely diagnosis?

Correct A. Chronic kidney disease

B. Diabetes mellitus

C. Hypertensive heart disease

D. Pulmonary hypertension

Correct Answer: A

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Question 21

In a human blood vessel, what is the primary function of the \endothelial cells lining the vessel wall?

A. To regulate blood pressure

Correct B. To facilitate the exchange of oxygen and carbon dioxide

C. To produce thromboxanes

D. To synthesize prostaglandins

Correct Answer: B

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Question 22

A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following genetic traits would be an example of a quantitative trait?

A. Eye color

Correct B. Wing length

C. Body color

D. Sex

Correct Answer: B

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Question 23

In a desert e\cosystem, what is the primary function of the xerophytic plants?

A. To produce large amounts of water

Correct B. To conserve water

C. To produce shade

D. To attract pollinators

Correct Answer: B

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Question 24

A patient is suffering from a kidney disorder that affects the excretion of waste products. Which of the following organs would be primarily responsible for compensating for the loss of kidney function?

Correct A. Liver

B. Lungs

C. Skin

D. Intestines

Correct Answer: A

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Question 25

In a coral reef e\cosystem, what is the primary function of the coral polyps?

A. To produce oxygen

B. To provide shelter for fish

Correct C. To produce coral skeletons

D. To filter water

Correct Answer: C

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