Question

Refer to the table. Biologists knock out the function of several genes in a bacterium, then examine whether the bacterium can grow. In the table, X denotes cases where the gene was knocked out, + indicates growth, and - indicates no growth. Gene Gene Gene Gene Gene Gene Gene Growth B D E F G х х х х Х х X + х - Х Х Based on these results, we can conclude that the minimal genome includes a. A, B, and C. b. A, C, and E. cC, F, and G. d.D, E, and F. e. D, F, and G

Answer 1

1) option e) D,F and G

Expalnation: According to above table, it can be seen that in case of gene (A,B), (B,C) and E bacteria has grown whereas in cases (A,D) , F, and (A,G) bacteria didn't grow which reflect that gene D,F,G are important for its growth as gene A is already shown to have no effect on growth of bacteria. So, minimal genome can be consist of these three (D,F,G).

2) a) Through transcription factor activity

Explanation: It is transcription factor that controls expression of genes in cells. Expression of particular gene in a specific cell type leads to give specific proteomics which give out specialised function to that cell. So, yes , transcription factors are main hands to drive cell differentiation.

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