Practice post utme redeemers university biology 2020 Past Questions

Question 1

In the context of classification of living things, what is the primary criterion for distinguishing between prokaryotes and eukaryotes?

A. Cell wall composition

Correct B. Presence of membrane-bound organelles

C. Type of cellular respiration

D. Size and complexity of cells

Correct Answer: B

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Question 2

A patient with a malfunctioning adrenal gland is experiencing symptoms of hyperkalemia. Which of the following hormones is primarily responsible for regulating potassium levels in the blood?

A. Adrenaline

Correct B. Aldosterone

C. Insulin

D. Glucagon

Correct Answer: B

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Question 3

A diagram of the human excretory system is shown below. Which of the following organs is responsible for filtering waste products from the blood?

A. Liver

Correct B. Kidney

C. Spleen

D. Pancreas

Correct Answer: B

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Question 4

A cell is in the process of undergoing mitosis. Which of the following stages is characterized by the condensation of chromatin into visible chromosomes?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 5

A patient is experiencing symptoms of a visual defect. Which of the following sense organs is responsible for detecting light and transmitting visual information to the brain?

Correct A. Eye

B. Ear

C. Nose

D. Tongue

Correct Answer: A

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Question 6

In a population of 1000 individuals, 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?

Correct A. 0.16

B. 0.24

C. 0.36

D. 0.48

Correct Answer: A

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Question 7

A researcher isolates a bacterium that exhibits the following characteristics: gram-positive, catalase-positive, and motile. Which of the following is the most likely genus?

Correct A. Bacillus

B. Escherichia

C. Pseudomonas

D. Staphylococcus

Correct Answer: A

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Question 8

A patient presents with symptoms of hyperglycemia, polyuria, and polydipsia. Which of the following hormones is most likely responsible for this condition?

Correct A. Insulin

B. Glucagon

C. Adrenaline

D. Thyroid-stimulating hormone

Correct Answer: A

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Question 9

A plant exhibits the following characteristics: leaves are alternate, stipules are absent, and the stem is herbaceous. Which of the following is the most likely family?

A. Asteraceae

B. Fabaceae

Correct C. Poaceae

D. Rosaceae

Correct Answer: C

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Question 10

A researcher isolates a microorganism that exhibits the following characteristics: gram-negative, catalase-negative, and non-motile. Which of the following is the most likely genus?

A. Escherichia

Correct B. Pseudomonas

C. Staphylococcus

D. Salmonella

Correct Answer: B

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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. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 12

A cell in interphase has a DNA content of 2C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?

A. 2C

Correct B. 4C

C. 6C

D. 8C

Correct Answer: B

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Question 13

A species of bird has a beak length of 5 cm. If the beak length increases by 10% per generation, what will be the beak length of the bird's offspring?

A. 5.5 cm

B. 6 cm

Correct C. 6.5 cm

D. 7 cm

Correct Answer: C

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Question 14

A diagram shows a cross between two pea plants, one with the genotype 'Tt' and the other with the genotype 'tt'. If the cross is between two heterozygotes, what is the probability that the offspring will have the genotype 'TT'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 0.9

Correct Answer: A

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Question 15

A diagram shows a cross between two pea plants, one with the genotype 'Tt' and the other with the genotype 'tt'. If the cross is between two heterozygotes, 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 16

In a population of E. coli, the frequency of a particular mutation is 0.05. If the population size is 10^6, calculate the number of individuals with the mutation.

Correct A. 500

B. 5000

C. 50000

D. 500000

Correct Answer: A

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Question 17

A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours. If the plant's growth rate is 0.5 cm/day, calculate the plant's height after 20 days.

A. 10 cm

B. 12 cm

Correct C. 15 cm

D. 18 cm

Correct Answer: C

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Question 18

A species of bird has a wing span of 1.5 meters. If the bird flies at a speed of 50 km/h, calculate the bird's wing beat frequency in Hz.

A. 2 Hz

B. 4 Hz

Correct C. 6 Hz

D. 8 Hz

Correct Answer: C

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Question 19

A cell has a membrane potential of -70 mV. If the cell is stimulated with a 1 ms pulse of 10 mV, calculate the cell's membrane potential after the pulse.

A. -80 mV

Correct B. -70 mV

C. -60 mV

D. -50 mV

Correct Answer: B

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Question 20

A population of bacteria grows according to the equation N(t) = N0 * e^(kt), where N(t) is the population size at time t, N0 is the initial population size, and k is the growth rate. If N0 = 100, k = 0.1, and t = 10, calculate the population size.

A. 1000

B. 10000

Correct C. 100000

D. 1000000

Correct Answer: C

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Question 21

In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 22

A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the stage of the cell cycle that this cell will enter next?

A. G1

B. S

C. G2

Correct D. M

Correct Answer: D

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Question 23

A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If the population is normally distributed, what is the probability that a randomly selected individual will have a height greater than 190 cm?

Correct A. 0.001

B. 0.01

C. 0.1

D. 0.5

Correct Answer: A

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Question 24

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

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Question 25

A diagram of a simple harmonic motion is shown below. Identify the amplitude of the motion.

A. 2 cm

Correct B. 4 cm

C. 6 cm

D. 8 cm

Correct Answer: B

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