The non-protein microbial antigens<span> can not stimulate classical </span>T<span> cell response by themselves, but they are able to elicit the production of antibodies, so that is why we call them </span>T<span> or thymus </span>independent antigens<span>. </span>T independent antigens<span> are divided into 2 classes by the mechanism of activating B cells. TI-1 </span>antigen<span>.
</span><span>For most protein antigens, the production of antibodies by B lymphocytes isdependent on stimulation of helper T cells. However bacterial polysaccharides and lipopolysaccharides, and some polymeric proteins, can stimulate B lymphocytes without involvement of helper T cells.
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Answer:
because if not metal than other things like glass wood or fabric would break or not be suitable for the key hole.
Explanation:
flip flops are made of plastic.
I Think The answer is a I hope it helps My friend
Answer:
0%
Explanation:
The cross of a pea plant with round seeds (RR) with another pea plant with wrinkled seeds (rr) is shown as under :
P RR x rr
F1 Rr Rr Rr Rr
It is clear from the cross above, all the 4 probable progenies in filial 1 (F1) generation will be heterozygous with Rr genotype. Not even a single progeny will have homozygous recessive genotype which is responsible for producing wrinkled seeds. Also, even though the genotype of the progenies will be Rr not RR yet phenotypically they all will have round seeds i.e. they will show dominant trait. The reason behind it is that one of the alleles R which is responsible for dominant trait will mask the expression of recessive allele r. So, wrinkled phenotype which is a recessive trait will not be observed in any of the progenies.