Advertisement Upgrade to remove ads

pyruvate is formed

in the cytosol

In mitochondria, exergonic redox reactions

provide the energy to establish the proton gradient

Which of the following is a true distinction between fermentation and cellular respiration?

NADH is oxidized by the electron transport chain only in respiration

Most of the energy that enters electron transport enters as

FADH2 and NADH

In the presence of a metabolic poison that specifically and completely inhibits the function of mitochondrial ATP synthase, which of the following would you expect?

an increase in the PH difference across the inner mitochondrial membrane

In fermentation, ______ is ________.

NADH.... oxidized

The immediate energy source that drives ATP synthase during oxidative phosphorylization is

the difference of H+ concentration on opposite sides of the inner mitochondrial membrane

Which metabolic pathway is common to both fermentation and cellular respiration?

glycolysis

Most CO2 from catabolism is released during

the Krebs cycle

Glycolysis is an __________ reaction.

Exergonic

When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs.

The PH of the matrix increases.

The final electron in the electron transport chain functions in oxidative phosphorylization is

oxygen

A major function in the mitochondrial inner membrane is the conversion of energy from electrons to the stored energy of the phosphate bond in ATP. To accomplish this function, this membrane must have all of the following feature EXCEPT

high permeability to protons

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?

Energy released from the movement of protons through ATP synthase

Carbon skeletons to be broken down during cellular respiration can be obtained from

polysaccharides, proteins, and lipids

During aerobic respiration, electrons travel downhill in which sequence?

food -> NADH -> Electron transport chain -> oxygen

Which of the following intermediary metabolites enters the Krebs cycle and is formed, in part, by the removal of CO2 from a molecule of pyruvate?

Acetyl CoA

During aerobic respiration, a proton gradient will be generated by ______ and used primarily for _________.

the electron transport chain... ATP synthesis

All of the following are products or intermediaries in glycolysis except

FADH2

Which of the following statements is true of fermentation?

It produces a net gain of ATP

The oxygen consumed during cellular respiration is directly involved in

accepting electrons at the end of the electron transport chain

The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is

the difference in H+ concentrations on opposites sides of the inner mitochondrial membrane

Catabolism of proteins, lipids, and carbohydrates can result in a 2-carbon molecule that enters the Krebs cycle. What is the molecule?

acetic acid or acetyl CoA

During aerobic respiration, which of the following directly donates electrons to the electron transport chain a the lowest energy level?

FADH2

All of the following statements about NAH+ are true EXCEPT

NAD + has more chemical energy than NADH

Hydrogen ions flowing through a cylinder causing the cylinder and attached rod to rotate like rushing steam turns a water wheel is an analogy that best describes

ATP synthesis activity

Muscle cells in oxygen deprivation convert pyruvate to _______ and in this step gain ______.

lactate.... NAD+

Cellular respiration harvests the most chemical energy from which process?

transferring electrons from organic molecules to oxygen

The primary role of oxygen in respiration is to

act as an aceptor for electrons and hydrogen, forming water

Which metabolic process is most closely associated with intracellular membranes

oxidative phosphorylation

Glycolysis is believed to be one of the most ancient of metabolic processes. Which statement below least supports this idea?

If run in reverse, glycolysis will build glucose molecules

Inside an active mitochondrion, most electrons follow which pathway?

Krebs cycle -> NADH -> electron transport chain -> oxygen

All of the following are functions of the Krebs cycle EXCEPT

adding electrons and protons to oxygen to form water

Where is ATP synthase located in the mitochondrion?

inner membrane

How many molecules of CO2 would be released from the complete aerobic respiration of a molecule of sucrose, a disaccharide?

12

During oxidative phosphorylation, H2O is formed. Where do they oxygen atoms in the H2O come from?

molecular oxygen

Which of the processes in eukaryotic cells will normally proceed whether O2 is present or absent?

Glycolysis

When hydrogen ions are pumped from the mitochondrial matrix across the inner membrane and into the intermembrane space, the result is

the creation of a proton gradient

All of the following statements about glycolysis are true EXCEPT

the end products of glycolysis are CO2 and H2O

How many carbon atoms feed into the Krebs cycle?

2 (two)

In addition to ATP, what are the end products of glycolysis?

NADH and pyruvate

The Krebs cycle produces which of the following molecules that then transfer energy to the electron transport chain?

FADH2 and NADH

The ATP made during fermentation is generated by which of the following?

substrate-level phosphorylation

How many ATP molecules are produced from the complete oxidation of a mole of glucose in cellular respiration?

36

IMAGE carbon skeletons for amino acid biosynthesis are supplied by intermediates of the Krebs cycle. Which intermediate would supply the carbon skeleton for synthesis of a 5-carbon amino acid?

α-ketoglutaric acid

IMAGE Refer to figure 9.2. How many ATP molecules can be made through substrate-level phosphorylation and oxidative phosphorylation with succinyl coA and ended with oxaloacetate?

7, apparently

IMAGE Refer to figure 9.2. Starting with citric acid and ending with oxaloacetic acid, how many ATP molecules can be formed from oxidative phosphorylation?

11

Where are the proteins of the electron transport chain located?

mitochondrial inner membrane

The electron transport chain energy is used to pump H+ ion into which location?

mitochondrial intermembrane space

Glycolysis takes place in which location?

the cytosol

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set