The first stage of a specific immune response is the activation of B cells and T cells.
Answer the following statement true (T) or false (F)
False
For specific immune response, recognition of the antigen is the first stage. Each lymphocyte can only bind to one type of antigen. So before activation can occur, the binding of the specific lymphocyte to the antigen must occur.
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The disinfectant screening method that is known as the ________ test, which is used to measure the potency of a disinfectant.
Fill in the blank(s) with the appropriate word(s).
With respect to DNA structure, polarity means that
A) DNA nucleotides can be either positively or negatively charged. B) the phosphate backbone of DNA is negatively charged. C) DNA nucleotides can be charged or uncharged. D) DNA strands have a 5? direction and a 3? direction.
Which of the following is absolutely necessary for diffusion to occur?
a. a phospholipid bilayer b. a living cell c. a selectively permeable membrane d. a concentration gradient
sexual reproduction includes
What will be an ideal response?