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Ontario Secondary (Grade 9-12) Metabolism — practice questions — page 2

Explore 56 free Metabolism questions in Ontario Secondary (Grade 9-12) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Metabolism questions and exercises with answers

Showing questions 31–56 of 56.

ATP is broken down using a water molecule. What is this type of reaction called?Read the answer and worked solution →What is the calculated free energy change for hydrolysis of one mole of ATP under standard conditions?Read the answer and worked solution →How does the free energy change of ATP hydrolysis inside a living cell compare with the standard value?Read the answer and worked solution →What happens to ATP that is not quickly used to perform work?Read the answer and worked solution →What is energy coupling, as cells use it?Read the answer and worked solution →During ATP hydrolysis at the sodium-potassium pump, what becomes of the gamma phosphate?Read the answer and worked solution →A molecule that has just been phosphorylated is in what state?Read the answer and worked solution →What is the substrate of an enzyme?Read the answer and worked solution →What happens to an enzyme when temperature or pH moves far outside its optimal range?Read the answer and worked solution →The induced-fit model replaced which earlier picture of enzyme and substrate binding?Read the answer and worked solution →An enzyme has finished catalyzing its reaction. What state is the enzyme itself in?Read the answer and worked solution →What is allosteric inhibition?Read the answer and worked solution →What does an allosteric activator do to an enzyme?Read the answer and worked solution →Statins reduce cholesterol levels by inhibiting which enzyme?Read the answer and worked solution →Acetaminophen, marketed as Tylenol, inhibits which enzyme?Read the answer and worked solution →What is the first challenge in developing a new drug that acts on an enzyme?Read the answer and worked solution →Cofactors and coenzymes differ in what way?Read the answer and worked solution →Which metal ion must DNA polymerase bind in order to function?Read the answer and worked solution →What are the most common sources of coenzymes?Read the answer and worked solution →Vitamin C serves as a coenzyme for enzymes that build which body component?Read the answer and worked solution →Pyruvate dehydrogenase is a multi-enzyme complex. How many cofactors and coenzymes does it require?Read the answer and worked solution →What is feedback inhibition?Read the answer and worked solution →Metabolism: true or false?Read the answer and worked solution →Complete the ATP storyRead the answer and worked solution →Match the metabolism termsRead the answer and worked solution →Pick the metabolism fact, fastRead the answer and worked solution →

Worked practice questions

ATP is broken down using a water molecule. What is this type of reaction called?

  1. A dehydration reaction
  2. A hydrolysis reaction
  3. A condensation reaction
  4. A phosphorylation reaction
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Correct answer: B. A hydrolysis reaction

1. ATP plus water yields adenosine diphosphate, one inorganic phosphate group and free energy. 2. Because the reaction takes place with the use of a water molecule, it is considered a hydrolysis reaction. 3. Phosphorylation is the separate process of a phosphate group binding to a molecule. 4. Dehydration and condensation both remove water rather than consuming it. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.4 ATP: Adenosine Triphosphate_

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What is the calculated free energy change for hydrolysis of one mole of ATP under standard conditions?

  1. Minus 2.1 kcal per mole
  2. Minus 7.3 kcal per mole
  3. Minus 18 kcal per mole
  4. Minus 30.5 kcal per mole
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Correct answer: B. Minus 7.3 kcal per mole

1. The calculated free energy change for hydrolysis of one mole of ATP into ADP and inorganic phosphate is minus 7.3 kcal per mole. 2. The same quantity expressed in the other unit is minus 30.5 kJ per mole, so 30.5 is the kilojoule figure rather than the kilocalorie figure. 3. The negative sign marks the reaction as exergonic, since energy is released. 4. The value 2.1 kcal per mole is the cost of moving one sodium ion across a membrane, a separate quantity. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.4 ATP: Adenosine Triphosphate_

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How does the free energy change of ATP hydrolysis inside a living cell compare with the standard value?

  1. It is roughly one quarter of the standard value
  2. It is exactly equal to the standard value
  3. It is almost double the standard value
  4. It becomes positive inside a living cell
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Correct answer: C. It is almost double the standard value

1. The standard calculation assumes pH 7.0, 25 degrees Celsius and 100 kilopascals, which are not the conditions inside a cell. 2. Cellular conditions vary considerably from these standards, so a different value is expected there. 3. The free energy change for hydrolysis of one mole of ATP in a living cell is almost double the value at standard conditions. 4. Doubling makes ATP hydrolysis a stronger energy source in the cell than the textbook standard figure suggests. 5. A value equal to the standard would contradict the point that cellular conditions differ. 6. The reaction still releases energy in the cell, so its sign does not flip to positive. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.4 ATP: Adenosine Triphosphate_

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