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प्रश्न
When a substrate is being metabolized, why does not all the energy that released in one step. It is released in multiple steps.What is the advantage of step-wise release?
उत्तर
The complete combustion of glucose, which produces CO2 and H2O as end products, yields energy most of which is given out as heat.
C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
If this energy is to be useful to the cell, it should be able to utilise it to synthesise other molecules that the cell requires. The strategy that the plant cell uses is to catabolise the glucose molecule in such a way that not all the liberated energy goes out as heat. The key is to oxidise glucose not in one step but. in several small steps enabling some steps to be just large enough such that the energy released can be coupled to ATP synthesis.
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संबंधित प्रश्न
Name the most common respiratory substrate.
Name the following:
Energy currency of cell.
Name the following:
Oxidative breakdown of carbohydrates to release energy.
Name the following:
An organism which respires throughout life anaerobically.
Name the following:
Aerobic respiration requires_________ .
Fill in the blank :
_________ are the openings found on older stems.
Fill in the blank :
Glycolysis occurs in the _______of the cells.
How do the following structures help in respiration in plants?
Stomata _____________
The following two chemical reactions are supposed to indicate a certain process occurring in the green plants under two different conditions:
(a) C6H12O6 + 6O2 → 6CO2 + _______ + 38 ATP
(b) C6H12O6 → ________ + 2 CO2 + 2 ATP
(i) Fill in the blank in each reaction.
(ii) Name the process represented by the two reactions.
(iii) What are the conditions under which the two reactions (a) and (b) are occurring respectively?
What do you understand by respiration?
Complete the following statement by choosing the correct alternative out of those given below.
Every living cell of the plant
Name the following:
The process of living beings which is concerned with the release of energy for use in the body.
The roots of a plant take up oxygen from the ______ trapped between the ________ particles.
Which gas present in the air is essential for aerobic respiration? What is the role of oxygen during respiration?
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was a sour smell too.
Why did the dough rise?
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was a sour smell too.
Why did the dough smell sour?
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was a sour smell too.
What would have happened if the dough was kept in the refrigerator, soon after it was prepared?
Explain the term “Energy Currency”. Which substance acts as energy currency in plants and animals?
It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?
How does a tree trunk exchange gases with the environment although it lacks stomata?
