Cellular Respiration

Question 1

What is cellular respiration?

Answer 1

The process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.

Question 2

True or False: Cellular respiration occurs only in the presence of oxygen.

Answer 2

False

Question 3

What is the main purpose of glycolysis?

Answer 3

To break down glucose into pyruvate, producing a small amount of ATP and NADH.

Question 4

What is produced during the krebs cycle?

Answer 4

ATP, NADH, FADH2, and carbon dioxide.

Question 5

What is the role of oxygen in cellular respiration?

Answer 5

To act as the final electron acceptor in the electron transport chain.

Question 6

True or False: Anaerobic respiration occurs without oxygen.

Answer 6

True

Question 7

What is lactic acid fermentation?

Answer 7

A type of anaerobic respiration that occurs in muscle cells, producing lactic acid and ATP.

Question 8

Fill in the blank: The electron transport chain occurs in the ______ of the mitochondria.

Answer 8

inner membrane

Question 9

What is the net gain of ATP from glycolysis?

Answer 9

2 ATP

Question 10

Multiple choice: Which molecule is primarily used by cells for energy? A) DNA B) ATP C) RNA D) Glucose

Answer 10

B) ATP

Question 11

What is oxidative phosphorylation?

Answer 11

The process of generating ATP using the energy from the electron transport chain and chemiosmosis.

Question 12

True or False: The krebs cycle occurs in the cytoplasm.

Answer 12

False

Question 13

What are the two types of fermentation?

Answer 13

Lactic acid fermentation and alcoholic fermentation.

Question 14

Fill in the blank: The main electron carriers produced during the citric acid cycle are ______ and FADH2.

Answer 14

NADH

Question 15

What is the role of ATP synthase in cellular respiration?

Answer 15

To synthesize ATP from ADP and inorganic phosphate using the proton gradient.

Question 16

Multiple choice: Which process generates the most ATP during cellular respiration? A) Glycolysis B) Citric Acid Cycle C) Electron Transport Chain D) Fermentation

Answer 16

C) Electron Transport Chain

Question 17

What is the total theoretical yield of ATP from one molecule of glucose during cellular respiration?

Answer 17

Up to 38 ATP

Question 18

cellular respiration

Answer 18

high energy reactants -> low energy products

C⁶H¹²O⁶ + O² -> CO² + H²O

1. Glycolysis
2. Link Rxn
3. Krebs Cycle
4. Electron Transfer

Question 19

glycolysis

Answer 19

cytoplasmic (even prokaryotes can perform)
anaerobic (no oxygen consumption)

in cytoplasm, glucose is broken down into 2 puruvates.

invest: 2 ATP +1 Glucose
outcome: 4 ATP + 2 NADH + 2 pyruvate

Question 20

Link reaction

Answer 20

pyruvate is split and added to coemzyme A to enter Krebs

2 pyruvates (3- carbon) -> 2 Acetyl-CoA
(coenzyme A: babysitter ensures carbon reacehs next step)

Question 21

Krebs Cycle

Answer 21

in mitochondrial matrix

removes H-atoms from carb source (pyruvate)

forms CO², NADH, FADH², ATP

Question 22

electron transport

Answer 22

inner membranes of mitochondria
90% of ATP generation from respiration

protons cross mitochondrial membranes, producing ATP

oxygen accepts electrons -> H²O

Question 23

oxidative phosphorylation

Answer 23

O² binds to hydrogen’s electrons -> H²O

aerobic

Question 24

anaerobic feedback ihibition

Answer 24

abundance of NADH from glycolysis, link rxn, krebs inhibits glycolysis

slows down glycloysis in absence of oxygen

consume pyruvate & NADH -> glycolysis continues