IB Biology AHL 8.2 Cellular respiration

IB Biology AHL 8.2 Cellular respiration

​Reduction and oxidation

​​Chemical reactions often involve a transfer of electrons.

This means the charge of atoms can change in a reaction as a gain of electrons means the atom becomes more negative (and a loss of electrons, an atom more positive).

For example,

​

​

​Reduction and oxidation

Multiple Choice

Which combination of changes describes biological oxidation?

• Electrons = Loss

  Oxygens =  Gain

  Hydrogens = Loss

• Electrons = Loss

  Oxygens =  Loss

  Hydrogens = Gain

• Electrons = Gain

  Oxygens =  Loss

  Hydrogens = Gain

• Electrons = Gain

  Oxygens =  Gain

  Hydrogens = Loss

Multiple Choice

Where does glycolysis take place in cells?

• Cytoplasm

• Mitochondrion

• Endoplasmic Reticulum

• Ribosomes

Multiple Choice

The first step of glycolysis results in the formation of:

• Glucose-6-Phosphate

• Fructose-6-Phosphate

• ATP

• 1,6 Bis-PhosphoGlycerate

Multiple Choice

Glycolysis results in the net gain of:

• 2 ATP

• 4 ATP

• 4 NADH

• 2 Acetyl CoA

Multiple Choice

Glycolysis results in the total production of:

• 2 ATP

• 4 ATP

• 4 NADH

• 2 Acetyl CoA

Multiple Choice

Glycolysis occurs during aerobic or anaerobic conditions.

• True

• False

Multiple Choice

Glycolysis requires

• ATP

• Oxygen

• sunlight

• NADP+

Multiple Choice

Where does the link reaction take place

• inner mitochondrial membrane

• cytoplasm

• mitochondrial matrix

• ribosome

Multiple Choice

How many carbon atoms does acetyl CoA contain?

• 1

• 2

• 3

• 4

Multiple Choice

The products of the link reaction are

• pyruvate and carbon dioxide

• carbon dioxide and co-enzyme A

• carbon dioxide, acetyl coA and NADH + H+

• NADH + H+ and carbon dioxide

Multiple Choice

Prior to entering the Krebs Cycle, each pyruvate molecule loses electrons, hydrogen ions, and a carbon, forming an energy-rich molecule of

• Acetyl-CoA

• Citrate

• Oxaloacetate

• Malate

Multiple Choice

The number of ATP molecules produced out of Krebs Cycle is:

• 2

• 3

• 4

• 0

Multiple Choice

How many FADH₂ molecules are produced by 1 molecule of glucose?

• 1

• 2

• 3

• 4

Multiple Choice

How many CO₂ molecules are produced by the Krebs Cycle for a molecule of glucose?

• 2

• 4

• 6

• 3

Multiple Choice

Krebs Cycle takes place in the:

• Cytoplasm

• Matrix

• Ribsome

• InterMembrane Space

Multiple Choice

After the Krebs Cycle only a small portion of the energy of glucose has been converted to ATP. At this point the majority of usable energy is contained in

• NADH and FADH₂

• Carbon Dioxide 

• Acetyl-CoA

• Citrate

Multiple Choice

Identify the site(s) in the Kreb's cycle where decarboxylation occurs

• Q and R

• R and S

• R only

• S and T

Multiple Choice

At which stage(s) in the diagram is ATP produced?

• R and S

• R only

• T only

• Link reaction

Multiple Choice

In the electron transport chain, oxygen acts as...

• a carrier of electrons, passing electrons down the chain

• a reducing agent

• the final electron acceptor

• a coenzyme

Multiple Choice

When protons are pumped outside the matrix, across the inner membrane...

• water is made

• a concentration gradient of H⁺ ions (protons) is created

• NADH gets reduced

• CO₂ is produced

Multiple Choice

The electrons that are transferred through the electron transport chain initially belonged to

• NADH

• FADH₂

• ATP

• NADH and FADH₂

Multiple Choice

The movement of protons (H⁺ ions) through ATP synthase occurs from the...

• matrix to the intermembrane space

• matrix to cytoplasm

• intermembrane space to the matrix

• intermembrane space to the cytoplasm

Multiple Select

Please indicate the correct equation(s) for Cellular Respiration. (2 answers)

• Glucose + Oxygen --> Carbon Dioxide + Water + Energy

• C₆H₁₂O₆ + O₂ --> CO₂ + H₂O + ATP

• Carbon Dioxide + Water + Energy --> Glucose + Oxygen

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

Multiple Choice

What does ATP synthase do?

• Create ATP in chemiosmosis.

• Break down ATP in chemiosmosis.

• Break down NADPH. 

• Create NADPH.

Multiple Choice

ATP synthesis by ATP synthase is driven by

• H⁺ movement

• electron movement

• NADH movement

• FADH₂ movement

Multiple Select

Please identify the proper locations for each step of cellular respiration.

• Glycolysis = Cytoplasm

• Glycolysis = Mitochondria

• Kreb's cycle = Cytoplasm

• Kreb's cycle = Mitochondria

• Oxidative Phosphorylation = Cytoplasm