How does yhe type of food source affect the rate of cellular respiration in yeast?

During cellular respiration large food molecules (glucose, sucrose) are broken down into small molecules with the release of energy. Just like all other organisms, the process of cellular respiration is vital for the survival of yeast.

The nature of food is an important factor that affects the rate of cellular respiration in microorganism-yeast.  

Reason:

This is because small food molecules are quickly broken down while large molecule like sucrose takes longer time. This makes large molecules less efficient source of energy for yeast as compared to small molecules.

Food sources of yeast:

Yeast can use different sugar and non-sugar based molecules as source of energy such as:

Glucose is a simplest sugar molecule and yeast do not needs to do much work for its breakdown. Unlike other sugars, glucose also enters in glycolysis directly while large sugars have to undergo hydrolysis before glycolysis. This means that glucose is more efficient than large sugars such as sucrose in meeting energy requirement and providing faster respiration rate.

Experimental evidences:

In experimentation, yeast was provided with different food sources and rate of respiration was determined by measuring the CO2 produced during respiration.

The results of the studies are as:

The experimental results also support the fact that the rate of cellular respiration is greatly dependent upon the food source.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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