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

What is the composition of ATP?

The ATP molecule is composed of a purine base (adenine), a 5-carbon sugar (ribose) and three phosphate groups at position 5 (carbon 5 in the ribose ring) of ribose molecule.

What is biological oxidation?

The maintenance of living system requires a continual supply of free energy which is ultimately derived from various oxidation reduction reactions like photosynthesis, respiration etc.

What are the major stages of cellular respiration?

Cellular respiration may be sub-divided into 4 stages.

  • Glycolysis
  • Pyruvic acid oxidation
  • Krebs cycle or citric acid cycle
  • Respiratory chain (Electron Transport Chain)

Where cellular respiration is carried out within the cell?

The first stage i.e., glycolysis is carried out in cytosol while other stages i.e., pyruvic acid oxidation, krebs cycle and respiratory chain (electron transport chain) occur within mitochondria.

What are the major phases of glycolysis? Or What is meant by preparatory and oxidative phases of glycolysis.

Glycolysis can be divided into two phases, a preparatory phase and an oxidative phase. In the preparatory phase breakdown of glucose occurs and energy is expended. In the oxidative phase high energy phosphate bonds are formed and energy is stored.

How glucose is activated in glycolysis?

The first step in glycolysis is the transfer of a phosphate group from ATP to glucose so that it is activated and a molecule of glucose-6-phosphate is formed.

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