In an experiment, mice were fed glucose containing a small amount of radioactive carbon

Problem

A gram of fat oxidized by respiration produces approximately twice as much ATP as a gram of carbohydrate. Which of the following best explains this observation?

Fats are produced when cells take in more food than they need.

Fats are less soluble in water than sugars.

Fats do not form true macromolecules as sugars do.

Fats are closely related to lipid molecules, which are the basic building blocks of cellular membranes.

Fats are better electron donors to oxygen than are sugars.

16. In an experiment, mice were fed glucose (C6H12O6) containing a small amount of radioactive oxygen.The mice were closely monitored, and after a few minutes radioactive oxygen atoms showed up inA.carbon dioxide.B. NADH.C. water.D.oxygen gas.

17. In preparing pyruvate to enter the citric acid cycle, which of the following steps occurs?

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18. How many molecules of ATP are gained by substrate-level phosphorylation from the completebreakdown of a single molecule of glucose in the presence of oxygen?

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19. Which of the following represents the major (but not the only) energy accomplishment of the citricacid cycle?

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20. After completion of the citric acid cycle, most of the usable energy from the original glucose moleculeis in the form ofA. ATP.B. CO2C. FADH2D.NADH

21. Which of the following events accompanies the conversion of pyruvate to acetyl CoA before the citricacid cycle?

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22. The energy given up by electrons as they move through the electron transport chain is used in whichof the following processes?

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chapter six chapter quiz

Question	Answer
In an experiment, mice were fed glucose (c6h22O6) containing a small amount of radioactive oxygen. The mice were closely monitored, and in a few minutes radio active oxygen atoms showed up in ________	carbon dioxide
The function of cellular respiration is to _____.	extract usable energy from glucose
An electron carrier acts as an energy-storage molecule when it is _____(for example)_____.	reduced.... NADH
a molecule is oxidized when it _______.	loses an electron
Which one of the following best describes the electron transport chain?	Electrons pass from one carrier to another, releasing a little energy at each step.
During respiration in a eukaryotic cell, reactions of glycolysis occur _______.	in the cytosol
During respiration in a eukaryotic cell, reactions of the Citric Acid cycle occur in _______.	the fluid within the mitochondrion
In preparing pyruvic acid to enter the Citric Acid cycle, which of the following steps does not occur?	Lactic acid is formed
When pyruvic acid is converted to acetyl CoA _______.	carbon dioxide and Nadh are formed
Most of the NADH that delivers electrons to the electron transport chain comes from _____.	the Citric Acid Cycle
Why is the Citric Acid cycle called a cycle?	the two-carbon acetic acid binds to a four-carbon molecule that is restored at the end of the cycle to be used again in the Citric Acid Cycle.
In the Citric Acid Cycle, the energy production per glucose molecule is _____	2 ATP, 6NADH, 2FADHsqaured
The major(but not sole)energy accomplishment of the Citric Acid cycle is the ____.	formation of NADH and FADH squared.
The enrgy given up by electrons as t hey move through the electron transport chain is used to _________.	pump H+ through a membrane
The ATP synthase in a human cell gets energy for making ATP directly from _______.	the flow of H+ through a membrane
In respiration, which one of the following is not done directly by the electron transport chain (or its components)?	add a P to ADP, making ATP
Which part of the breakdown of glucose requires molecular oxygen?	the electron transport chain
During aerobic respiration, molecular oxygen is used to ________.	at the end of the electron transport chain to accept electrons and form H2O.
Which one of the following is the source of the energy that pumps hydrogen ions across the inner mitochondrial membrane?	electrons
Most of the ATP produced in cellular respiration comes from _______.	the flow of electrons across the inner mitochondrial membrane.
When a poison such as rotenone blocks the electron transport chain, glycolysis and the Citric acid cycle soon grind to a halt as well because, ______.	they run out of NAD+ and FAD+
In cellular respiration,___is oxidized and ___, is reduced.	glucose... oxygen
Fermentation is essentially glycolysis plus an extra step in which pyruvic acid is reduced to form lactic acid or alcohol and carbon dioxide. This last step____.	enables the cell to recycle NAD+
Sports physiologists at an Olympic training center wanted to monitor athletes to determine at what point their muscles were functioning anaerobically. They could do this by checking for a build up of _____.	lactic acid
How much ATP can a cell make from one glucose molecule in the presence of carbon Monoxide?	2 ATP
In glycoloysis in the absence of oxygen, cells need a way to regenerate which compound?	NAD+

In an experiment, mice were fed glucose containing a small amount of radioactive carbon

A gram of fat oxidized by respiration produces approximately twice as much ATP as a gram of carbohydrate. Which of the following best explains this observation?

chapter six chapter quiz

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