Question 1

Which of the following best describes the role of an enzyme in a chemical reaction?

Accepted Answer

It lowers the activation energy of the reaction.

Question 2

Oxidation is the ______ of electrons, and reduction is the ______ of electrons.

Accepted Answer

loss; gain

Question 3

Which of the following statements about cellular respiration and photosynthesis is true?

Accepted Answer

Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria.

Question 4

The breakdown of which reactant is used to produce energy for the cell and begins with glycolysis?

Accepted Answer

glucose

Question 5

Stages two and three of cellular respiration take place in the ______ of the cell, which is also where aerobic respiration occurs.

Accepted Answer

mitochondria

Question 6

When a cell uses chemical energy to perform work, it uses the energy released from an ______ reaction to drive an ______ reaction where energy is absorbed.

Accepted Answer

exergonic; endergonic

Question 7

Which statement regarding the movement of electrons during cellular respiration is true?

Accepted Answer

Carbon is oxidized when it donates electrons to oxygen and forms carbon dioxide.

Question 8

In the exergonic reaction $A ightarrow B + C + 	ext{heat}$, which of the following is true?

Accepted Answer

The potential energy of the products is less than that of the reactant.

Question 9

Which of the following equations represents photosynthesis incorrectly?

Accepted Answer

$6CO_2 + 6H_2O \rightarrow 6CO_2 + 6O_2$

Question 10

During redox reactions, what happens to electrons?

Accepted Answer

Electrons are lost from one substance and added to another substance.

Question 11

In which stage is most of the ATP generated during aerobic cellular respiration?

Accepted Answer

During stage 3: oxidative phosphorylation (e.g., electron transport chain)

Question 12

In the drawing, if structure C represents a thylakoid membrane and region A represents the stroma, what organelle is being depicted?

Accepted Answer

Chloroplast

Question 13

What is the source of energy that provides the boost for electrons during photosynthesis?

Accepted Answer

Light

Question 14

Mitochondria transfer ______ energy from ______ to ATP; chloroplasts transform ______ energy into the chemical energy of ATP.

Accepted Answer

chemical; food; light

Question 15

What is the basic difference between exergonic (exothermic) and endergonic (endothermic) reactions?

Accepted Answer

Exergonic reactions release energy overall; endergonic reactions absorb energy overall.

Question 16

What is true about the data in the accompanying figure showing potential energy versus progress of the reaction?

Accepted Answer

The dashed line represents a reaction that has been catalyzed by an enzyme.

Question 17

Which process is endergonic (endothermic)?

Accepted Answer

Photosynthesis: the synthesis of glucose from carbon dioxide and water

Question 18

The processes of photosynthesis and cellular respiration are complementary. During these energy conversions, especially during cellular respiration, some converted energy is:

Accepted Answer

Lost in the form of heat.

Question 19

Why are most plants green?

Accepted Answer

Many chlorophyll dyes reflect green light.

Question 20

The full range of electromagnetic energy is called the ______ spectrum, and photosynthesis utilizes the part of the ______ portion of the spectrum.

Accepted Answer

electromagnetic; visible

Study Guide: Cellular Respiration, Photosynthesis, and Bioenergetics

Study Guide - Practice Questions

Study Guide - Flashcards