Question

Continuously functional genes which are regulated on the tissue level are
A) Housekeeping genes
B) Luxury genes
C) Regulatory genes
D) Both B and C

Answer 1

Hint: Genes can be defined as the basic and functional unit of heredity. It is made up of DNA and some of the genes can act as instructions which are needed for synthesis of proteins.

Complete answer:
The gene comes in four types A, C, T and G. A gene is a section of DNA made up of a sequence of As, Cs, Ts and Gs. Your genes are so tiny you have around 20,000 of them inside every cell in your body! Human genes vary in size from a few hundred bases to over a million bases..
Option A: Housekeeping genes are typically constitutive genes that are required for the maintenance of basic cellular function, and they are not tissue specific expression. Therefore, this is the correct option.
The characteristics of housekeeping genes are,
i) They are present in all cells.
ii) Their expression levels are almost constant in various experimental conditions.
iii) They are required for maintenance of basic cellular function.
Option B: Luxury genes are tissue-specific or organ-specific, which means they are not expressed in all cells. They are not constantly expressed, only when their function is needed. Therefore, this is the incorrect option.
Option C: Regulatory gene is a gene involved in controlling the expression of one or more other genes. And they are tissue specific . Therefore, this is the incorrect Option.
Option D: As both B and C are incorrect, therefore, this is the incorrect option.

Thus , the correct answer is option (A) housekeeping genes.

Note: Housekeeping genes are constitutive genes which are required for maintenance of basic cellular functions and they are expressed in almost all the cells under normal conditions. Examples of housekeeping genes include ACTB, 18S, etc.