Plzzz help I’m being timed Question 4
During the process of transcription, which of the following events occurs directly after RNA polymerase recognizes the transcription start site of a gene?
A. A Free-floating nucleotide pairs up with the exposed DNA bases

B. A The DNA strand begins to unwind, separating the two strands.

C. A A complimentary RNA strand detaches itself from the DNA.

D. A The polymerase strings amino acids into a polypeptide.

B

Explanation:

the begin to unwind because of the amino acid

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.