When making bread with common yeast, the reaction starts as an aerobic process and then becomes an anaerobic process after the oxygen is spent. A baker has created a new strain of yeast which contains no cytochrome c gene and, thus, no cytochrome c protein. This will affect what the yeast strain can do to obtain energy.

Question

When making bread with common yeast, the reaction starts as an aerobic process and then becomes an anaerobic process after the oxygen is spent. A baker has created a new strain of yeast which contains no cytochrome c gene and, thus, no cytochrome c protein. This will affect what the yeast strain can do to obtain energy.

Use the passage to answer the question.

What will this yeast strain do more of, compared to a normal strain?

electron transport

carbon dioxide production

fermentation

ATP synthesis

Answer 1

The yeast strain without the cytochrome c gene and protein will not be able to carry out aerobic respiration due to the lack of cytochrome c, which is involved in the electron transport chain. Therefore, the yeast strain will rely more on anaerobic processes such as fermentation to obtain energy. This means that the yeast strain will do more fermentation compared to a normal strain. So, the correct answer is fermentation.