Metabolism and Nutrition: Overview of Metabolic Reactions

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Questions and Answers

What percentage of the energy used during ATP production is converted into heat?

  • 10%
  • 90%
  • 30%
  • 60% (correct)

Which mode of heat transfer accounts for the largest percentage of heat loss in the human body?

  • Radiation (correct)
  • Conduction
  • Convection
  • Evaporation

What is the approximate percentage of energy expended for thermoregulation in the human body?

  • 10% (correct)
  • 20%
  • 5%
  • 15%

Which nutrient requires the most energy to break down in the body?

<p>Proteins (A)</p> Signup and view all the answers

Which of the following is not a water-soluble vitamin?

<p>Vitamin K (A)</p> Signup and view all the answers

What is the approximate caloric equivalent of 1 pound of fat?

<p>3500 calories (C)</p> Signup and view all the answers

Which of the following is true about catabolic reactions?

<p>They release energy by breaking down molecules (B)</p> Signup and view all the answers

What happens during glycolysis?

<p>Glucose is converted to pyruvate, producing a net gain of 2 ATP molecules (A)</p> Signup and view all the answers

What is the primary function of the electron transport chain (ETC)?

<p>To produce ATP through oxidative phosphorylation (C)</p> Signup and view all the answers

Which of the following is true about ketogenesis?

<p>It produces ketone bodies as an alternative fuel source when glucose is low (A)</p> Signup and view all the answers

What is the primary function of the urea cycle?

<p>To remove excess nitrogen from amino acid breakdown (B)</p> Signup and view all the answers

During the absorptive state, which of the following is true?

<p>Glucose is being stored as glycogen (B)</p> Signup and view all the answers

What is the primary role of the Krebs cycle?

<p>To generate high-energy electron carriers (NADH and FADH2) for the electron transport chain (B)</p> Signup and view all the answers

Which of the following is true about lipogenesis?

<p>It is the process of synthesizing lipids from excess acetyl CoA when glucose is plentiful (C)</p> Signup and view all the answers

What is the primary role of gluconeogenesis?

<p>To produce glucose from non-carbohydrate precursors like pyruvate and lactate (B)</p> Signup and view all the answers

Which of the following is true about the starvation state?

<p>Ketone bodies become the primary energy source after several days (B)</p> Signup and view all the answers

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Chapter 24 Metabolism and Nutrition PDF

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