Which of the following is an example of inducible gene?

Gene for enzymes of glycolysis

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Gene for enzymes of citric acid cycle

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Immunoglobulin genes in lymphocytes

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Gene for proteins of electron – transport chain

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Solution

The correct option is C
Immunoglobulin genes in lymphocytes

There are 2 types of genes on the basis of gene expression:

Constitutive genes: Housekeeping genes – A number of protein coding genes active in all cells and all the time. These are required for housekeeping functions such as enzymes of glycolysis, citric acid cycle and proteins of electron transport chain.

Facultative/Inducible genes: Genes which are active only in speciﬁc cell type and are responsible for deﬁning the speciﬁc character and function of these cells. e.g., Immunoglobulin genes in lymphocytes, myosin in muscle.

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Which of the following statement is incorrect ?

(a) for every hormone there is a gene

(b) for every protein there is a gene

(d) for every type of fat there is a gene

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