Which of the following statements is FALSE?

a. Cdk7 of the CAK (TFIIH component) phosphorylates Cyclin 8 of the Mediator to down regulate promoter activity.
b. TFIIF (RAP74 RAP30) show similarity to sigma 70 domains 2 and 3.
c. TFIIF has affinity for the zinc-ribbon at the N-terminus of TFIIB.
d. Archaea have a factor nearly identical to TFIIB called TFB.
e. Mediator binds the CTD of RNA pol II when the CTD is hypophosphorylated and leaves when the CTD becomes hyperphosphorylated.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Nucleus is the organelle that contains chromosomes