One indication of the relative importance of various ATP-producing pathways is t

Question

One indication of the relative importance of various ATP-producing pathways is the Vmax of certain enzymes of these pathways. The values of Vmax of several enzymes from the pectoral muscles (chest muscles used for flying) of pigeon and pheasant are listed below.

(a) Discuss the relative importance of glycogen metabolism and fat metabolism in generating ATP in the pectoral muscles of these birds.

(b) Compare oxygen consumption in the two birds.

(c) Judging from the data in the table, which bird is the long-distance flyer?Justify your answer.

(d) Why were these particular enzymes selected for comparison? Would the activities of triose phosphate isomerase and malate dehydrogenase be equally good bases for comparison? Explain.

max (umol substrate/min/g tissue) Enzyme Hexokinase Glycogen phosphorylase Phosphofructokinase-1 Citrate synthase Triacylglycerol lipase Pigeon 3.0 18.0 24.0 100.0 Pheasant 2.3 120.0 143.0 15.0 0.07 0.01

Explanation / Answer

a) FROM THE DATA , IT REVEALS THAT

Beta oxidation predominates in pigeon.

in the pheasant, anaerobic glycolysis of glycogen predominates
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b)

Compare oxygen consumption in the two birds.

C)

and thus limit ATP production rates.

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