Question

Rec A protein moves in
A)3' - 5' direction
B)Bidirectional
C)5'- 3' direction in DNA
D)3' - 5' direction in RNA

Answer 1

Hint: The Rec A protein is known to play a very important function in homologous recombination. It is present in E. coli, its homologs are known to be found in archaeans and eukaryotes as well.

Complete answer:
The RecA protein is known to bind to single strands of DNA in order to form a nucleoprotein structure. The RecA protein is known to initiate an exchange between the nucleoprotein and duplex strand. The nucleoprotein helical strand mediates complex interactions on single-stranded DNA (ssDNA), which has a very distinct shape (asymmetric), which promotes the exchange between the strands in a polarized fashion. This occurs in a direction of 5' to 3' w.r.t to single stranded DNA.

The RecA protein is 38 kilodalton which is essential for the purpose of DNA repair and maintenance. RecA is a structural, functional homolog which is found in many species. The homologous protein found in different species is known as RAD51 in case of eukaryotes. RecA is known to have a number of activities where all are concerned with DNA repair.

Hence, the correct answer is option (C)

Note: The RecA is considered to be a key protein which is found in the process of DNA recombination and repair. RecA is known to form filaments on DNA. In case of normal cell growth, the RecA–GFP complex is known to form many foci in a cell, which are formed either on the nucleoid or might be at a distance from the nucleoid.