Question 1

Which statement best describes the First Law of Thermodynamics as it applies to biological systems?

Accepted Answer

Energy can be transferred and transformed, but cannot be created or destroyed.

Question 2

A glow-in-the-dark reaction in click beetle larvae is an example of which biological process?

Accepted Answer

Bioluminescence

Question 3

Which of the following best explains why energy transformations in cells are never 100% efficient?

Accepted Answer

Some energy is always lost as heat, increasing the entropy of the universe.

Question 4

Which equation correctly represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T \Delta S$$

Question 5

A reaction has $$\Delta G = -25 kJ/$$mol. What does this indicate about the reaction?

Accepted Answer

The reaction is spontaneous and releases free energy.

Question 6

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

Accepted Answer

A molecule of glucose storing chemical energy in its bonds.

Question 7

Why do living organisms not violate the Second Law of Thermodynamics when they increase in complexity?

Accepted Answer

Organisms increase the entropy of their surroundings while maintaining local order.

Question 8

Which statement about enzymes is correct?

Accepted Answer

Enzymes accelerate chemical reactions by lowering the activation energy barrier.

Question 9

In cellular metabolism, what is the role of ATP?

Accepted Answer

ATP couples exergonic reactions to endergonic reactions, providing energy for cellular work.

Question 10

Which process is an example of a catabolic pathway?

Accepted Answer

Breakdown of glucose during cellular respiration.

Question 11

A protein loses its function after exposure to high temperature. This is most likely due to:

Accepted Answer

Denaturation, which disrupts the protein's specific structure.

Question 12

Which of the following best describes chemical equilibrium in a reaction?

Accepted Answer

The forward and reverse reactions occur at the same rate, and concentrations of reactants and products remain constant.

Question 13

Which of the following is a real-world example of kinetic energy?

Accepted Answer

Water moving through a hydroelectric turbine.

Question 14

Which statement about exergonic and endergonic reactions is correct?

Accepted Answer

Exergonic reactions have a negative $$\Delta G$$ and are spontaneous.

Question 15

A cell maintains continuous work by avoiding equilibrium. Which type of system does this describe?

Accepted Answer

Open system

Question 16

Which of the following increases the entropy of a system?

Accepted Answer

Diffusion of molecules from high to low concentration.

Question 17

Which process is an example of energy transformation in living organisms?

Accepted Answer

Conversion of sunlight into chemical energy during photosynthesis.

Question 18

Which of the following statements about metabolic pathways is correct?

Accepted Answer

Catabolic pathways break down complex molecules, releasing energy.

Question 19

If a cell couples the breakdown of glucose (an exergonic reaction) to the synthesis of ATP (an endergonic reaction), what is the overall effect on free energy?

Accepted Answer

The overall process is spontaneous because the energy released from glucose breakdown drives ATP synthesis.

Question 20

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

Accepted Answer

Enzymes are regulated to ensure reactions occur at the right time and place.

Chapter 8 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard