FOOD PROCESSING AND PRESERVATION
FERMENTATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Why does osmotic stress occur in alcoholic fermentation?
|
|
Ethanol concentration decrease
|
|
|
Increased water activity
|
|
|
Decreased water activity
|
|
|
Increased concentration of ethanol
|
Explanation:
Detailed explanation-1: -Osmotic stress leads to efflux or influx of water from or into the cell: hyperosmotic stress causes shrinking, hypoosmotic stress causes swelling. The cellular responses to this type of stress deal with the activity of water channels (aquaporins) and electrolyte transporters, and the accumulation of osmolytes (I.
Detailed explanation-2: -For instance, yeast cells in a water droplet on a grape berry may suddenly be exposed to high sugar levels when the berry breaks open due to animal or fungal activity. Then yeast cells experience a hyperosmotic shock (or osmotic upshift), accompanied by rapid water outflow and cell shrinking.
There is 1 question to complete.