Practice post utme afe babalola university biology 2023 Past Questions

Question 1

In a population of 1000 individuals, 20% are heterozygous for the ABO blood group. If 10% of the population is randomly selected for a blood donation drive, what is the probability that at least one individual in the selected group is homozygous recessive for the ABO blood group?

A. 0.2

B. 0.5

Correct C. 0.8

D. 0.9

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2

A 2.5 kg block of wood is placed on a frictionless surface. If a force of 10 N is applied to the block, what is the acceleration of the block?

A. 2 m/s^2

B. 4 m/s^2

Correct C. 6 m/s^2

D. 8 m/s^2

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3

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

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4

A 5 kg block of wood is placed on a frictionless surface. If a force of 20 N is applied to the block, what is the acceleration of the block?

A. 4 m/s^2

B. 6 m/s^2

C. 8 m/s^2

Correct D. 10 m/s^2

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5

A plant with the genotype AaBb is crossed with a plant with the genotype aaBb. What is the probability that the offspring will have the genotype AaBb?

A. 0.5

Correct B. 0.75

C. 0.9

D. 0.95

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 6

In the context of cellular respiration, what is the primary function of the electron transport chain?

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2

Correct C. To generate a proton gradient across the mitochondrial membrane

D. To synthesize glu\cose from pyruvate

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7

A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's turgor pressure?

A. It will decrease due to water loss

Correct B. It will increase due to water uptake

C. It will remain the same

D. It will decrease due to cell lysis

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8

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

A. To synthesize proteins

Correct B. To store genetic information

C. To regulate cell growth

D. To transport materials across the cell membrane

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9

A diagram of a human circulatory system is shown below. What is the function of the structure labeled 'B'?

A. To pump blood to the lungs

Correct B. To pump blood to the body

C. To regulate blood pressure

D. To filter waste from the blood

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 10

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

A. To synthesize proteins

B. To store genetic information

Correct C. To regulate cell growth

D. To transport materials across the cell membrane

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11

In the context of blood transport systems, what is the primary function of the erythrocyte membrane?

A. To regulate the movement of ions and nutrients across the membrane

B. To maintain the structural integrity of the cell

Correct C. To facilitate the exchange of gases between the blood and tissues

D. To synthesize and store hemoglobin

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12

A researcher is studying the effects of pH on the growth of E. coli. Which of the following graphs best represents the relationship between pH and bacterial growth?

Correct A. \( y = 2x^2 + 3x - 4 \)

B. \( y = -2x^2 + 3x + 4 \)

C. \( y = 2x^2 - 3x - 4 \)

D. \( y = -2x^2 - 3x + 4 \)

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 13

A diagram of the xylem tissue in a plant stem is shown below. What is the primary function of the tracheids in this tissue?

Correct A. To transport water and minerals from the roots to the leaves

B. To store water and nutrients in the stem

C. To provide structural support to the stem

D. To regulate the opening and clo\sing of stomata

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14

A researcher is studying the effects of light intensity on the rate of photosynthesis in a plant. Which of the following graphs best represents the relationship between light intensity and photosynthetic rate?

Correct A. \( y = \frac{1}{x} \)

B. \( y = x^2 \)

C. \( y = 2x^2 - 3x - 4 \)

D. \( y = -2x^2 + 3x + 4 \)

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 15

A diagram of the digestive system in a human is shown below. What is the primary function of the pancreas in this system?

A. To produce digestive enzymes that break down proteins

B. To produce digestive enzymes that break down carbohydrates

Correct C. To produce digestive enzymes that break down fats

D. To absorb nutrients from the small intestine

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16

A researcher is studying the effects of temperature on the growth of a microorganism. Which of the following graphs best represents the relationship between temperature and growth rate?

Correct A. \( y = 2x^2 + 3x - 4 \)

B. \( y = -2x^2 + 3x + 4 \)

C. \( y = 2x^2 - 3x - 4 \)

D. \( y = -2x^2 - 3x + 4 \)

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17

A diagram of the xylem tissue in a plant stem is shown below. What is the primary function of the xylem vessels in this tissue?

Correct A. To transport water and minerals from the roots to the leaves

B. To store water and nutrients in the stem

C. To provide structural support to the stem

D. To regulate the opening and clo\sing of stomata

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18

A researcher is studying the effects of light intensity on the rate of photosynthesis in a plant. Which of the following graphs best represents the relationship between light intensity and photosynthetic rate?

Correct A. \( y = \frac{1}{x} \)

B. \( y = x^2 \)

C. \( y = 2x^2 - 3x - 4 \)

D. \( y = -2x^2 + 3x + 4 \)

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the protein kinase Cdk1. What is the primary function of Cdk1 in this process?

Correct A. To phosphorylate and activate the nuclear lamina

B. To bind to and inhibit the anaphase-promoting complex

C. To regulate the spindle checkpoint

D. To control the condensation of chromatin

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20

In a tropical rainforest, the primary producers are the plants and algae that undergo photosynthesis to produce glu\cose and oxygen. What is the byproduct of photosynthesis that is released into the atmosphere?

A. Carbon dioxide

Correct B. Oxygen

C. Nitrogen

D. Water vapor

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21

In a human cell, the process of cellular respiration occurs in three main stages: glycolysis, the citric acid cycle, and oxidative phosphorylation. What is the primary function of the electron transport chain in oxidative phosphorylation?

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2

Correct C. To pump protons across the mitochondrial membrane

D. To reduce oxygen to water

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the protein kinase Cdk1. What is the primary function of the anaphase-promoting complex (APC) in this process?

A. To phosphorylate and activate the nuclear lamina

B. To bind to and inhibit the spindle checkpoint

Correct C. To regulate the separation of sister chromatids

D. To control the condensation of chromatin

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23

In a human body, the process of gas exchange occurs in the lungs, where oxygen is absorbed into the bloodstream and carbon dioxide is removed. What is the primary function of the alveoli in this process?

Correct A. To absorb oxygen into the bloodstream

B. To remove carbon dioxide from the bloodstream

C. To regulate the pH of the blood

D. To control the rate of breathing

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the protein kinase Cdk1. What is the primary function of the spindle checkpoint in this process?

A. To phosphorylate and activate the nuclear lamina

Correct B. To bind to and inhibit the anaphase-promoting complex

C. To regulate the separation of sister chromatids

D. To control the condensation of chromatin

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25

In a human body, the process of cellular respiration occurs in three main stages: glycolysis, the citric acid cycle, and oxidative phosphorylation. What is the primary function of the citric acid cycle in this process?

A. To generate ATP through substrate-level phosphorylation

Correct B. To produce NADH and FADH2

C. To pump protons across the mitochondrial membrane

D. To reduce oxygen to water

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

POST UTME AFE BABALOLA UNIVERSITY 2023 Biology | Objective

Master the Exam!

Help others prepare! Share this practice hub: