SAC Flashcards
(16 cards)
What is yeast and what does it require
yeast is a fungus and requires energy for growth which is obtained via aerobic respiration in the prsence of oxygen or anaerobic respiration in the absense of oxygen
If oxygen is short in supply what does Yeast do
Yeast releases ATP energy from glucose via anaerobic respiration, producing ethanol and C02 as the byprodcuts
How do yeasts stay dormant
they have a small supply of glucose within their cell that they use to produce ATP for survival as they remain dormant.
During alcohol fermentation, what are the yeast exposed to
During alcohol fermentation, the yeasts are exposed to water and sugar and low to no oxygen
Why is anaerobic respiration a quicker reaction than aerobic respiration
anaeorbic respiration has fewer enzyme reactions tha taerobic repsriaton
What is a drawback of anerobic repsriaton for yeasts
an excess amount of ethanol is produced because yeast are not able to grow when the alcohol content gets too high because ethanol disrupts cell membranes, inhibits enzyme activity, and induces metabolic stress, ultimately leading to cell death.
Anaerobic cellular respiration produces 2 ATP, whereas aerobic cellular respiration produces 30 or 32 ATP.
what happens if the oxygen sensor gets wet and why
yeast mixture can produce lots of froth that can get into the oxygen sensor and damage the oxygen sensor which would cause inaccurate readings, decreasingthe accuracy of the expiermnet
cellular respiration equation
C6H1206+602—6C02+6H20+30 or 32 ATP
Gross photosythenssis
the total rate of carbon fixiation(reduction of C02) without consideiring that some of C02 is generated in respiration
Net photosythensis
is the carbon fixation rate minus the rate of C02 loss in respiration
When does dormancy occur
After a seed drops from a plant, it usually goes into dormancy period until all favourable conditions are met which can sometimes take a few years.
What happens in dormancy
the seed respires very slowly using the glucose stored and does not germinate
compare dormancy and germinaton
Both processes repsire, but germintation respires more, and more phootyshtensis occurs in germinitaiton
germintation
Germination is the process by which a seed begins to sprout and grow into a new plant,
dormancy
period where the seed remains inactive and does not germinate until all favourable condtiosn are met
How could dormancy be broken
deterioration of seed coat, elevated soil nutrients, soil temperatures, increased moisture/rain
