Living organisms need free energy to survive; this free energy is supplied to them in the form of ATP. ATP is formed by the oxidation of organic compounds during respiration. So, respiration is an oxidative process.
The compounds which are oxidized during respiration
D.
The compounds which are reduced during respiration
Answer: Option B
Explanation:
Respiratory substrates are the organic compounds which are oxidized during respiration and releases energy in the form of free energy. The respiratory substrate may be carbohydrates, fats, proteins, and organic acids. Carbohydrates are the most commonly used respiratory substrate.
Which of the following condition occur by incomplete oxidation of respiratory substrate?
A.
Feedback inhibition
B.
Feedback repression
C.
Aerobic condition
D.
Anaerobic condition
Answer: Option D
Explanation:
Anaerobic condition arises due to the absence of oxygen where incomplete oxidation of respiratory substrate takes place while aerobic reaction takes place in the presence of oxygen and undergoes in complete oxidation.
Which of the following is not an aerobic reaction?
A.
Fermentation
B.
Oxidative phosphorylation
C.
Citric acid cycle
D.
Glycolysis
Answer: Option A
Explanation:
Among all the options fermentation is anaerobic process while all other reactions take place in the presence of oxygen. Glycolysis takes place in the cytosol, the citric acid cycle takes place in mitochondrial matrix and site of oxidative phosphorylation is an inner mitochondrial membrane.
Which of these enzymes in glycolysis do not take part in an irreversible reaction?
A.
Glucokinase
B.
Pyruvate kinase
C.
Phosphofructokinase
D.
Hexokinase
Answer: Option A
Explanation:
Hexokinase, phosphofructokinase, and pyruvate kinase catalyzed reactions in glycolysis is irreversible while rest reactions are reversible in nature. So, the regulation of glycolysis is also done by allosteric regulation of these three enzymes.
