Question 1

Which of the following best describes the difference between catabolic and anabolic pathways in cellular metabolism?

Accepted Answer

Catabolic pathways break down complex molecules into simpler ones, releasing energy, while anabolic pathways build complex molecules from simpler ones, consuming energy.

Question 2

A student claims that plants are energy producers because they create energy during photosynthesis. Based on the first law of thermodynamics, how should you respond?

Accepted Answer

Plants do not create energy; they transform light energy into chemical energy, consistent with the principle that energy cannot be created or destroyed.

Question 3

Which of the following scenarios best illustrates the second law of thermodynamics?

Accepted Answer

A car engine converts gasoline into motion, but most of the energy is lost as heat, increasing the disorder of the surroundings.

Question 4

Which of the following is an example of potential energy in a biological context?

Accepted Answer

The arrangement of electrons in the bonds of a glucose molecule.

Question 5

During cellular respiration, glucose is broken down and energy is released. According to the study materials, what happens to most of this energy?

Accepted Answer

It is converted into heat, which is released to the surroundings, increasing entropy.

Question 6

Which equation best represents the first law of thermodynamics as applied to a biological system?

Accepted Answer

$$\Delta E = Q + W$$

Question 7

A cell takes in glucose (a highly organized molecule) and releases carbon dioxide and water (less organized molecules) as waste. Which law or concept does this process best illustrate?

Accepted Answer

The cell is increasing the entropy of its surroundings, consistent with the second law of thermodynamics.

Question 8

Which of the following best explains why living organisms are considered 'open systems' in thermodynamics?

Accepted Answer

They exchange both energy and matter with their surroundings, such as absorbing nutrients and releasing waste.

Question 9

A person eats an apple, climbs a ladder, and then jumps into a pool. Which sequence correctly matches the main form of energy at each stage?

Accepted Answer

Chemical energy in the apple; kinetic energy climbing; potential energy at the top; kinetic energy jumping; heat energy in the water.

Question 10

Which of the following statements about entropy is correct?

Accepted Answer

Entropy is a measure of molecular disorder or randomness in a system.

Question 11

Which of the following processes is considered spontaneous according to the second law of thermodynamics?

Accepted Answer

A process that increases the entropy of the universe.

Question 12

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Enzymes catalyze specific steps in metabolic pathways, allowing reactions to proceed efficiently.

Question 13

A scientist observes that the breakdown of starch in an animal produces carbon dioxide, water, and heat. Which of the following best explains this observation?

Accepted Answer

The process is catabolic, releasing energy and increasing the entropy of the surroundings.

Question 14

Which of the following is NOT a correct statement about energy transformations in living organisms?

Accepted Answer

Living organisms can recycle energy indefinitely without any loss.

Question 15

Which of the following best explains why the evolution of complex organisms does not violate the second law of thermodynamics?

Accepted Answer

Because the decrease in entropy within the organism is offset by a greater increase in entropy in the surroundings.

Question 16

Which of the following is an example of kinetic energy in a biological system?

Accepted Answer

The movement of cilia on the surface of a cell.

Question 17

A metabolic pathway converts molecule A to molecule D through a series of enzyme-catalyzed steps. If enzyme 2 is inhibited, what is the most likely immediate result?

Accepted Answer

Molecule B will accumulate, and the production of C and D will decrease.

Question 18

Which of the following best describes the relationship between chemical energy and heat in biological systems?

Accepted Answer

Some chemical energy is used to do work, but much is lost as heat, increasing entropy.

Question 19

Which of the following best explains why a crowded room becomes warmer as more people enter?

Accepted Answer

Each person’s metabolic reactions release heat, increasing the thermal energy of the room.

Question 20

Which of the following is the best example of a spontaneous process in a biological system?

Accepted Answer

The diffusion of oxygen from an area of high concentration to low concentration across a membrane.

Metabolism and Energy Transformations in Living Organisms

Guida di studio - Domande di pratica

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