A.
Explanation: Because he learned it in previous years when it was different, now it becomes hard to learn the new information.
Toxins are endogenous target molecules that may trigger perturbations in cell function and/or structure or that may initiate repair mechanisms at the molecular, cellular, and/or tissue levels. Mode of action
Uncouplers of oxidative phosphorylation. Involves toxicants that uncouple the two processes that occur in oxidative phosphorylation: electron transfer and adenosine triphosphate (ATP) production. Acetylcholinesterase (AChE) inhibitors.
They block electron transport chain in mitochondria.
Answer:
Option D, Either of the two answer choices could explain
Explanation:
Yeast has different types of enzyme that convert different sugar into different form based on the environment. For example maltase enzyme is necessary to convert maltose sugar into simple sugar in aerobic condition under specific pH and temperature range. While on the other hand glucose can be converted into alcohol in anaerobic conditions.
Thus, the factors which could affect the respiration pathway adopted by yeast depends on
a) Environment condition including presence of air, temperature and pH
b) Type of food available and enzymes
Hence, both option A and B can explain the experiment results.
Thus, option D is correct