Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following statements is false? Imagine that you ingested three chocolate bars just before sitting down to study this chapter. Most likely:

a. your brain cells are using ATP.

b. there is no deficit of the initial substrate to begin glycolysis.

c. the respiratory processes in your brain cells are moving atomsfrom glycolysis through the citric acid cycle to the electrontransfer system.

d. after a couple of hours, you change position and stretch torest certain muscle cells, which removes lactate from thesemuscles.

e. after 2 hours, your brain cells are oxygen-deficient.

Summary Introduction


Cells respire through two processes, namely aerobic respiration and anaerobic respiration. The cells use oxygen to produce ATP (adenosine triphosphate) in aerobic respiration. There is no need for oxygen to produce ATP in anaerobic respiration. Both processes are effective, but in the presence of oxygen, the cell produces more ATP.


Justification/explanation for the correct answer:

Option (e) is, ‘the deficiency of oxygen occurs in the brain cells after 2 hours’. Body cells are known to compensate for the absence of oxygen to keep the function of the cells going and produce energy. This statement is false. Hence, option (e) is the correct answer.

Explanations for the incorrect answers:

Option (a) is, ‘ATP is used by brain cells’. ATP is produced with the help of anaerobic respiration. There is a constant need for energy in the body and because of which energy is produced with or without the help of oxygen. This statement is true. So, it is an incorrect option.

Option (b) is, ‘the initial substrate is not deficient in the body to start the glycolysis pathway’. The fundamental substrate which is required to initiate glycolysis is glucose. The glucose is found in a stored form, which is glycogen, in the liver...

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