Respiration

Question 1

Define respiration.

Answer 1

The biochemical process where cells convert glucose and oxygen into energy, carbon dioxide, and water.

Question 2

What is the primary purpose of respiration?

Answer 2

To produce ATP, the energy currency of the cell.

Question 3

True or false: Aerobic respiration requires oxygen.

Answer 3

TRUE

Aerobic respiration is more efficient than anaerobic respiration.

Question 4

Fill in the blank: Anaerobic respiration occurs in the absence of ______.

Answer 4

Oxygen

Question 5

What is the equation for aerobic respiration?

Answer 5

Glucose + Oxygen → Carbon Dioxide + Water + Energy (ATP)

Question 6

Define ATP.

Answer 6

Adenosine triphosphate, the main energy carrier in cells.

Question 7

What is the role of mitochondria in respiration?

Answer 7

Mitochondria are the sites of aerobic respiration and ATP production.

Question 8

True or false: Fermentation is a type of anaerobic respiration.

Answer 8

TRUE

Fermentation produces less energy than aerobic respiration.

Question 9

Fill in the blank: Lactic acid is produced during anaerobic respiration in ______.

Answer 9

Muscle cells

Question 10

What is the byproduct of alcoholic fermentation?

Answer 10

Ethanol and carbon dioxide.

Question 11

Define glycolysis.

Answer 11

The first stage of respiration, breaking down glucose into pyruvate.

Question 12

What happens to pyruvate in aerobic conditions?

Answer 12

It enters the Krebs cycle for further energy extraction.

Question 13

True or false: The Krebs cycle occurs in the cytoplasm.

Answer 13

FALSE

The Krebs cycle occurs in the mitochondria.

Question 14

Fill in the blank: The electron transport chain generates ATP through ______.

Answer 14

Oxidative phosphorylation

Question 15

What is the net gain of ATP from glycolysis?

Answer 15

2 ATP molecules per glucose molecule.

Question 16

Define oxidative phosphorylation.

Answer 16

The process of ATP production using energy from electrons transferred through the electron transport chain.

Question 17

What are the two main types of respiration?

Answer 17

Aerobic and anaerobic respiration.

Question 18

True or false: Cellular respiration and breathing are the same.

Answer 18

FALSE

Breathing is the physical process of inhaling and exhaling air.

Question 19

Fill in the blank: NADH and FADH2 are ______ in respiration.

Answer 19

Electron carriers

Question 20

What is the final electron acceptor in aerobic respiration?

Answer 20

Oxygen.

Question 21

Define anaerobic fermentation.

Answer 21

A process that converts glucose into energy without oxygen, producing lactic acid or ethanol.

Question 22

What is respiratory quotient (RQ)?

Answer 22

The ratio of carbon dioxide produced to oxygen consumed during respiration.

Question 23

True or false: Respiration occurs only in animals.

Answer 23

FALSE

Respiration occurs in all living organisms, including plants and fungi.

Question 24

Fill in the blank: The Krebs cycle produces ______ and NADH.

Answer 24

ATP

Question 25

What is the **importance** of the electron transport chain?

Answer 25

It generates the majority of ATP during cellular respiration.

Question 26

Define **aerobic respiration**.

Answer 26

A metabolic process that requires oxygen to produce energy from glucose.

Question 27

Define **aerobic respiration**.

Answer 27

A metabolic process that uses oxygen to convert glucose into energy.

Question 28

What is the **main product** of anaerobic respiration in yeast?

Answer 28

Ethanol and carbon dioxide.

Question 29

Fill in the blank: **ATP** stands for _______.

Answer 29

Adenosine triphosphate.

Question 30

True or false: **Fermentation** occurs in the absence of oxygen.

Answer 30

TRUE ## Footnote Fermentation is an anaerobic process used by some organisms to generate energy.

Question 31

What is the **role of oxygen** in aerobic respiration?

Answer 31

It acts as the final electron acceptor in the electron transport chain.

Question 32

Define **glycolysis**.

Answer 32

The first stage of cellular respiration that breaks down glucose into pyruvate.

Question 33

What are the **end products** of glycolysis?

Answer 33

Two molecules of pyruvate, two ATP, and two NADH.

Question 34

Fill in the blank: The **Krebs cycle** occurs in the _______.

Answer 34

Mitochondrial matrix.

Question 35

True or false: The **electron transport chain** produces the most ATP.

Answer 35

TRUE ## Footnote It generates approximately 34 ATP molecules per glucose molecule.

Question 36

What is the **function of NAD+** in respiration?

Answer 36

It acts as an electron carrier, facilitating energy transfer.

Question 37

Define **oxidative phosphorylation**.

Answer 37

The process of ATP production using energy from the electron transport chain.

Question 38

What is **lactic acid fermentation**?

Answer 38

A process where glucose is converted into lactic acid and ATP in muscle cells.

Question 39

Fill in the blank: **Substrate-level phosphorylation** occurs during _______.

Answer 39

Glycolysis and the Krebs cycle.

Question 40

True or false: **Anaerobic respiration** produces more ATP than aerobic respiration.

Answer 40

FALSE ## Footnote Aerobic respiration yields more ATP due to complete oxidation of glucose.

Question 41

What is the **net gain** of ATP from glycolysis?

Answer 41

Two ATP molecules.

Question 42

Define **chemiosmosis**.

Answer 42

The movement of ions across a selectively permeable membrane to generate ATP.

Question 43

What is the **role of FAD** in respiration?

Answer 43

It serves as an electron carrier, similar to NAD+.

Question 44

Fill in the blank: The **final products** of the Krebs cycle include _______.

Answer 44

Carbon dioxide, ATP, NADH, and FADH2.

Question 45

What is **acetyl-CoA**?

Answer 45

A molecule that enters the Krebs cycle, derived from pyruvate.

Question 46

Define **anaerobic respiration**.

Answer 46

A type of respiration that occurs without oxygen, producing less energy.

Question 47

What is the **function of the electron transport chain**?

Answer 47

To transfer electrons and pump protons to create a proton gradient.

Question 48

When is NADH produced

Answer 48

Glycolysis and the Krebs cycle.

Question 49

True or false: **Photosynthesis** and respiration are opposite processes.

Answer 49

TRUE ## Footnote Photosynthesis converts carbon dioxide and water into glucose and oxygen.

Question 50

What is the **primary energy currency** of the cell?

Answer 50

ATP (adenosine triphosphate).

Question 51

Define **substrate-level phosphorylation**.

Answer 51

The direct anaerobic transfer of a phosphate group to ADP to form ATP.

Question 52

What is the **overall equation** for aerobic respiration?

Answer 52

Glucose + oxygen → carbon dioxide + water + ATP.