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Cellular Respiration Quiz: Learn and Practice for Free

Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products. – wikipedia

Cellular Respiration Quiz

Cellular Respiration

Quiz Questions

1) During which step is H2O formed?

  • glycolysis
  • krebs cycle
  • ETC
  • fermentation

2) During which step is CO2 produced?

  • glycolysis
  • krebs cycle
  • ETC
  • fermentation

3) During which step is O2 (oxygen) used?

  • glycolysis
  • krebs cycle
  • ETC
  • fermentation

4) During which step is glucose broken down?

  • glycolysis
  • krebs cycle
  • ETC
  • fermentation

5) Which step produces the most NADH and FADH2?

  • glycolysis
  • krebs cycle
  • ETC
  • fermentation

6) Which is the correct order of the steps of cellular respiration

  • glycolysis > krebs cycle > ETC
  • glycolysis > ETC > krebs cycle
  • krebs cycle > ETC > glycolysis
  • ETC > glycolysis > krebs cycle

7) Which step provides the most ATP?

  • glycolysis
  • krebs cycle
  • electron transport chain
  • fermentation

8) Which type of fermentation do people do?

  • Lactic acid fermentation
  • alcohol fermentation

9) Which type of respiration is most efficient?

  • Aerobic
  • Anaerobic

10) The energy in ATP is stored

  • in the bond between the second and third phosphate
  • in the bond between the first and second phosphate
  • in the bond between the adenosine and the first phosphate
  • I like turtles

11) Where does anaerobic respiration occur?

  • glucose molecule
  • mitochondria
  • cytoplasm

12) Glycolysis results in a net gain of how many ATP?

  • 0
  • 2
  • 4
  • 1

13) Which molecule isn’t an energy carrier?

  • FADH2
  • NADH
  • oxygen
  • ATP

14) What is cellular respiration?

  • the breakdown of glucose  to release ATP
  • the breakdown of glucose to release NADH
  • the breakdown of glucose to release FADH
  • the breakdown of glucose to release carbon

15) Cellular Respiration’s goal is to

  • make water
  • make ATP
  • make glucose
  • make  oxygen

16) Where does the Krebs Cycle take place?

  • mitochondria
  • chloroplast
  • cytoplasm
  • nucleus

17) What is the correct equation for cellular respiration?

  • 6O2 + C6H12O6 -> 6CO2 + 6H2O + Energy
  • 6O2 + C6H12O6 + Energy -> 6CO2 + 6H2O
  • 6CO2 + 6H2O -> 6O2 + C6H12O6 + Energy
  • 6CO2 + 6H2O + Energy -> 6O2 + C6H12O6

18) What are the reactants in the equation for cellular respiration?

  • oxygen and lactic acid
  • carbon dioxide and water
  • glucose and oxygen
  • water and glucose

19) In which way are photosynthesis and cellular respiration different?

  • Cellular respiration stores ATP, while photosynthesis releases ATP.
  • Cellular respiration produces oxygen, while photosynthesis uses oxygen.
  • Photosynthesis releases energy, while cellular respiration stores energy.
  • Photosynthesis used carbon dioxide, while cellular respiration produces carbon dioxide.

20) How many ATP are produced in aerobic respiration?

  • 2
  • 33
  • 4
  • 36

21) The mitochondria is responsible for …

  • photosynthesis
  • anaerobic respiration
  • aerobic respiration
  • fermentation

22) The expression “feel the burn” means that a person exercising is doing

  • lactic acid fermentation
  • alcoholic fermentation
  • photosynthesis
  • aerobic respiration

23) What is the molecule called that mitochondria produce when they respire glucose?

  • ATP
  • ADP
  • DNA
  • 80p

24) What type of respiration requires oxygen?

  • Aerobic
  • Anaerobic

25) What are the products of aerobic respiration?

  • Glucose and oxygen
  • Carbon dioxide and water
  • Lactic acid
  • Carbon monoxide

26) What happens to your breathing rate when you exercise?

  • It increases
  • It decreases
  • It stays the same

27)  A plant is releasing a gas. What is the mosl tlikely the gas?

  • co2
  • methane
  • water vapor
  • oxygen

28)  ______________ produces the most ATP.

  • photosnthesis
  • aerobic respiration
  • anaerobic respiration
  • glycolysis

29) What is one of the reactants of cellular respiration?

  • energy
  • glucose
  • carbon dioxide
  • water

30) All living things do which of the following?

  • Chemosynthesis
  • Respiration
  • photosynthesis
  • all of the answers

31) If oxygen is not present, this step will happen after glycolysis

  • Krebs cycle
  • Electron Transport Chain
  • Fermentation

Terms and Answers to Learn

cellular respiration
the process in which cells make ATP by breaking down organic compounds
the process in which autotrophs convert light energy into chemical energy
which types of organisms undergo cellular respiration
both autotrophs and heterotrophs
what happens when organic compounds are broken down into simpler compounds
energy is released
what is the energy released by the organic compound mostly used to do
produce ATP
the products of cellular respiration (3)
CO2, water, and ATP
two stages of cellular respiration
glycolysis and aerobic respiration
a biochemical pathway in which one six-carbon molecule of glucose is oxidized to produce two three-carbon molecules of pyruvic acid
how photosynthesis and cellular respiration depend on each other
the products of photosynthesis are the reactants of cellular respiration, and the reactants of photosynthesis are the products of cellular respiration
does not require the presence of oxygen
aerobic respiration
pyruvic acid is broken down and NADH is used to make lots of ATP
what pyruvic acid undergoes with no oxygen present
the breakdown of pyruvic acid by enzymes, bacteria, yeasts, or mold in the absence of oxygen
type of reaction in cellular respiration
redox reaction
one reactant loses electrons and another gains electrons
cellular respiration equation
C6H12O6+6O2—> 6CO2+6H2O+ATP
where the reactions of glycolysis take place
step one glycolysis
two phosphate groups are attached to one molecule of glucose, ATP converted to ADP
step two glycolysis
6-carbon molecule split into two 3-carbon molecules of G3P
step three glycolysis
G3P molecules lose electrons and receive another phosphate group, two molecules of NAD+ converted into NADH
step four glycolysis
all phosphate groups are removed from the molecule to make two molecules of pyruvic acid, the four released phosphates convert four ADP to four ATP
net yield of ATP in glycolysis
total ATP produced in glycolysis
how many NADH molecules produced in glycolysis
how NAD+ becomes NADH
electrons released through glycolysis attach to NAD+
where pyruvic acid goes if there’s no oxygen
what fermentation regenerates
what fermentation does not produce
how various fermentation pathways differ (2)
enzymes and products
the two common fermentation pathways products
lactic acid and ethyl alcohol
lactic acid fermentation
pyruvic acid is converted into lactic acid
what is used to make lactic acid
one hydrogen atom from NADH and one free hydrogen proton
what happens to NADH in lactic acid fermentation
it is oxidized and converted to NAD+
type of reaction that occurs in muscles during strenuous exercise
lactic acid fermentation
organ where lactic acid is converted back into pyruvic acid
the liver
where lactic acid is converted back into pyruvic acid
how many carbons in lactic acid
alcoholic fermentation
pyruvic acid is converted into ethyl alcohol
organisms that use alcoholic fermentation
plant cells and unicellular organisms
process of alcoholic fermentation (2 steps)
CO2 is removed from pyruvic acid, two hydrogen atoms added
what is regenerated in alcoholic fermentation
one kilocalorie=? calories
efficiency of glycolysis=
energy required to make ATP/energy released by oxidation of glucose
where pyruvic acid goes when oxygen is available
aerobic respiration
aerobic respiration produces ?x as much ATP as glycolysis
two stages of aerobic respiration
the Krebs cycle and the electron transport chain
process by which ATP is made using the energy released as protons move across a memrbrane
as glucose is oxidized NAD+ is…
converted into NADH
the Krebs cycle, function
breaks down acetyl CoA
where the Krebs cycle takes place (eukaryotes)
the mitochondria
where the Krebs cycle takes place (prokaryotic)
mitochondrial matrix
the space inside the inner and outer membranes of a mitochondrion
what the mitochondrial matrix contains
enzymes to catalyze the reactions of the Krebs cycle
in the mitochondrial matrix, pyruvic acid reacts with ? to form ?, and releases a ?
CoA, acetyl CoA, CO2 molecule
products of the Krebs cycle (3)
CO2, hydrogen atoms, and ATP
final electron acceptor of ETC
efficiency of cellular respiration=
energy required to make ATP/energy released by oxidation of glucose


Cellular Respiration POGIL Answers

What is represented by the hexagon?
Glucose (6C)
How many carbon atoms (C) are in one molecule of glucose?
How many carbon atoms (C) are in one molecule of pyruvic acid?
In the process of glycolysis, what happens to glucose after it crosses the cell membrane into the cytoplasm of the cell?
It splits into 2 pyruvic acids when it crossed.
Thinking about the number of carbon atoms in glucose and in pyruvic acid, explain why there is one molecule of glucose on the left side of the arrow and two molecules of pyruvic acid on the right side of the arrow.
There is only 3 carbon in pyruvic acid, so since glucose had 6 carbon, it split into 2 pyruvics making 6 altogether.
How many ATP molecules are produced during glycolysis?
Hydrogen-carrying molecules are also produced during glycolysis. What is the symbols of these hydrogen-carrying molecules?
Does glycolysis occur inside or outside the mitochondria?
According to Model 2, what happens to pyruvic acid during the Kreb’s cycle?
It turns into 3 molecules of carbon dioxide.
According to Model 2, where does the change identified in the previous question occur?
Mitochondrial matrix.
Note the number of atoms of carbon in pyruvic acid and explain why three molecules of carbon dioxide are produced.
Each pyruvic acid molecule contains 3 carbon atoms and each carbon dioxide molecule contains only 1. 3 x 1= 3
Considering the glycolysis produces 2 pyruvic acid molecules per glucose molecule, how many total CO2 molecules will be produced from the complete breakdown of each glucose molecule? Show a mathematical equation to support your answer.
6 because each pyruvic acid has 3 carbons and 2 pyruvic molecules are produced. (3 x 2 =6)
What 2 hydrogen carrying molecules are formed during the Kreb’s cycle?
Kreb’s cycle (1st pyruvic acid)
Kreb’s cycle (2nd pyruvic acid)
What cell structure is the site for the electron transport chain?
Inner Mitochondrial Membrane
What substance do the carrier proteins transport across the inner mitochondrial membrane?
What high energy molecules are formed by the electron transport chain?
What atom accepts the hydrogen ion at the end of the electron transport chain?
What molecule is formed as a product of that acceptance?
Formulate an explanation for why the events of the ETC constitute an aerobic process rather than an anaerobic process (like glycolysis)
The ETC is an aerobic process because it requires oxygen.
# of ATP produced-2 # of H-carriers produced NADH-2 FADH2-0
Kreb’s Cycle
# of ATP produced-2 # of H-carriers produced NADH-8 FADH2-2
# of H-carriers produced NADH-x3 FADH2-x2
Total ATP Produced
# of ATP Produced-4 #of H-carriers produced NADH-30 FADH2-4
Grand Total ATP Produced (Add all 3 columns above)
Used in- Glycolysis
Used in- ETC
Produced in- Kreb’s Cycle
Produced in- ETC
38 ATP
Produced in- Glycolysis-2 Kreb’s-2 ETC-34
Compare the ATP available to cells when oxygen is present versus when it is absent. How might this help explain why brain and heart functions are so quickly affected when a person cannot breathe?
Because there would be only a little bit of ATP able to be produced without oxygen, the cells of the brain and heart would die and the functions would stop.
What are the two substances that may be formed in anaerobic respiration?
Lactic acid/alcohol + CO2
Recall that two molecules of ATP are formed during glycolysis. Neither fermentation process shown above creates any more ATP. Knowing this, what would you Predict about the cellular energy available to organisms that carry out fermentation?
They don’t need much energy since glycolysis produces only a little ATP & fermentation produced none.
Research the relationship between overexertion of muscles and the formation of lactic acid. How does this relate to “the burn” felt during strenuous activity?
When muscles require more energy aerobically, they switch to anaerobic respiration, the lactic acid produced builds up & produces a burning sensation in the muscles.
What common foods involve the process of fermentation? Use your text or other resource to make a list of the foods and the specific organic organisms used.
Cheese- various fungi
Bread- Saccharomyces cerevisiae & other yeasts
Yogurt- various bacteria


Cellular Respiration Overview – Khan Academy

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