quiz 9.4-9.6 biology

The starting molecule for the Krebs cycle is

pyruvic acid

In which types of organisms does the process shown in the figure below?

both plants and animals

The energy source that makes oxidative phosphorylation possible comes from

electrons that are transferred from NADH.

Which of these processes takes place in the cytoplasm of a cell?

glycolysis

Which of the following is the correct sequence of events in cellular respiration?

glycolysis ---- kerbs cycle ---- electron transport

Where are the proteins of the electron transport chain located?

mitochondrial inner membrane

Glycolysis provides a cell with a net gain of

2 ATP molecules

For each mole of glucose (C6H12O6) oxidized by cellular respiration, how many moles of CO2 are released in the citric acid cycle (see the accompanying figure)?

4

Cellular respiration uses oxygen to convert the chemical energy stored in organic molecules into

ATP

Glycolysis requires

ATP

The energy of the electrons passing along the electron transport chain is used to make

ATP

In the absence of oxygen, yeast cells can obtain energy by fermentation, which results in the production of which of the following sets of molecules?

ATP, CO2, and ethanol (ethyl alcohol)

Which of the following statements best describes the primary role played by oxygen in cellular respiration?

It serves as the final acceptor for electrons from the electron transport chain.

Following glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2 with some net gain of ATP. Most of the energy from the original glucose molecule at that point in the process, however, is stored in the form of which of the following molecules?

NADH

Which of the following molecules carries electrons that will be used to reduce other molecules in an electron transport chain?

NADH

Which electron carrier(s) function in the citric acid cycle?

NADH and FADH2

The Krebs cycle produces

NADH and carbon dioxide

Under what conditions do photosynthesis and cellular respiration occur in plants?

Photosynthesis occurs only in the light, and cellular respiration occurs in both the dark and the light.

If you were to add one of the eight citric acid cycle intermediates to the culture medium of yeast growing in the laboratory, what do you think would happen to the rates of ATP and carbon dioxide production?

The rates of ATP production and carbon dioxide production would both increase.

The oxygen consumed during cellular respiration is directly involved in which of the following processes or events?

accepting electrons at the end of the electron transport chain

Which one of the following is formed by the removal of a carbon (as CO2) from a molecule of pyruvate?

acetyl CoA

Which process is used to make bread rise?

alcoholic fermentation

When yeasts are exposed to anaerobic conditions, they regenerate NAD+ from NADH in a series of reactions that make CO2 and ________.

ethanol

Fermentation produces more ATP molecules than aerobic respiration does.

false

Cellular respiration releases energy by breaking down

food molecules

What are the reactants in the equation for cellular respiration?

glucose and oxygen

Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?

glycolysis

In which reactions of cellular respiration and fermentation does substrate-level phosphorylation occur?

in both glycolysis and the citric acid cycle

Photosynthesis is to chloroplasts as cellular respiration is to

mitochondria

Carbon dioxide is split to form oxygen gas and carbon compounds in which of the following metabolic pathways?

neither photosynthesis nor respiration

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is

oxygen

The Krebs cycle does NOT occur if

oxygen is not present

During which of the following metabolic processes is most of the CO2 from the catabolism of glucose is released?

the citric acid cycle

Which of the following events takes place in the electron transport chain?

the harnessing of energy from high-energy electrons derived from glycolysis and the citric acid cycle

The enzyme phosphofructokinase (PFK) catalyzes a key step in glycolysis. About 10% of Springer spaniels suffer from canine PFK deficiency. Given its critical role in glycolysis, which of the following conditions would be a likely consequence for dogs afflicted with this disorder?

they would be lethargic and readily tire from exercise.

The NADH produced by the Krebs cycle donates electrons to the electron transport chain.

true

Which of these is a product of cellular respiration?

water