Final answer:
The process that cannot be studied in yeast from the given options is cell motility, as yeast cells lack the structures necessary for movement.
Step-by-step explanation:
Brewer's yeast, often referred to as Saccharomyces cerevisiae, is commonly used in the fields of baking and brewing due to its fermentative abilities. However, it is also highly valued in scientific research as a model organism for studying eukaryotic cellular processes. To address which processes cannot be studied using yeast, we can consider the options provided:
- DNA replication occurs in yeast, making it a valuable model for understanding this fundamental biological event.
- Cell motility is not a feature of brewer's yeast, as they are generally non-motile organisms, which limits the ability to study this process using yeast.
- Exocytosis and cell division are both processes that occur in yeast, thus allowing these processes to be studied using this organism.
Hence, the process that cannot be studied in yeast among the options given is cell motility. This is because yeast cells do not have the structures required for motility, such as flagella or cilia, which are present in some other eukaryotic cells.
While yeast may have limitations in studying cell motility, it remains a powerful tool for genetic and cellular biology studies, helping scientists to unravel complex cellular mechanisms that are often conserved across eukaryotes, including humans.