Question

Continuously functional genes which are regulated on the tissue level are

• A. House keeping genes
• B. Luxury genes
• C. Regulatory genes
• D. Both B and C

Answer 1

The correct option is D Both B and C

Genes which respond to specific stimuli and are expressed in specific cells are called luxury genes; they are not expressed all the time and show tissues specific variation in expression which in turn impart the difference in morphology and physiology to the individual. The luxury genes are also termed as regulatory genes. The genes which are constitutively expressed are called housekeeping genes. They are expressed at relatively constant level in all the cells of an organism and thus do not follow the tissue-specific expression. A set of structural genes which are under control of single sensor site is termed as gene battery; the sensor site is connected to multiple integrators to control their transcription and thereby regulating multiple produced genes at the same time in different cells. This means that they do not follow a tissue-specific expression. Thus, the correct answer is option D.