Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?
A) glucose
B) proteins
C) fatty acids
D) glucose, proteins, and fatty acids
E) Such yeast cells will not be capable of catabolizing any food molecules, and will therefore die.

Question

Quizplus · Accepted Answer

Yeast cells with defective mitochondria are unable to carry out cellular respiration and generate ATP via oxidative phosphorylation. However, they can still produce ATP via glycolysis, which does not require mitochondria. Glucose is the primary substrate for glycolysis and can provide enough ATP for yeast cells to survive, although they may grow more slowly than cells with fully functional mitochondria. Yeast cells can also catabolize other substrates like proteins and fatty acids, but they require functional mitochondria to do so efficiently. Therefore, the best choice is A, glucose, as it is the most readily available and efficient substrate for glycolysis.

Yeast Cells That Have Defective Mitochondria Incapable of Respiration Will