Chapter 11 (Bioenergetic) F.Sc 1st Year Biology Short Questions

What are the major ways by which cell processes pyruvic acid?

Cell processes pyruvic acid in three major ways, alcoholic fermentation, lactic acid fermentation and aerobic respiration.

What is the difference between aerobic and anaerobic respiration?

The respiration that occurs in the absence of oxygen is referred to as anaerobic (without oxygen). The respiration that occurs only in the presence of oxygen is called aerobic respiration. During aerobic respiration glucose is completely oxidized to CO2 and water and energy is released.

Where and when anaerobic respiration occurs in man and other animals?

This form of anaerobic respiration occurs in muscle cells of humans and other animals during extreme physical activities, such as sprinting (running), when oxygen cannot be transported to the cells as rapidly as it is needed.

How much energy is released by anaerobic respiration (or alcoholic and lactic acid fermentation)?

Both alcoholic and lactic acid fermentation yield relatively small amount of energy from glucose molecule. Only about 2% of the energy present within the chemical bonds of glucose is converted into adenosine triphosphate (ATP).

Where oxygen is involved in aerobic respiration?

Oxygen is involved in the last step when it accepts H to form water molecule.

What is ATP? or Give importance of ATP.

Adenosine triphosphate, generally abbreviated ATP is a compound found in every living cell. It plays the key role in most biological transformations for example, synthesis of more complex compounds, active transport across the cell membrane, muscular contraction, and nerve conduction etc.

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