Answer:
4. B cells become activated by interacting with helper T cells.
1. B cells display antigens in MHC class II receptors on the cell surface.
2. Antibodies released by plasma cells bind to the antigen so they will be destroyed by other cells of the immune system.
3.B cells rearrange their DNA to create a unique B-cell receptor.
5. B cells undergo clonal expansion.
6. B cells digest antigens that bind to the antibodies on their surface.
Explanation:
B-cells get activated by interacting with helper T cells when they bind to the antigen to receptors i.e (MHC class II receptors on the cell surface) on the surface of the cell. Series of activities such as release by plasma cells which cause rearrangement of B cells causes the cell to divide and proliferate. The process through which daughter cells arise from a parent cell called clonal expansion.
Covalent bond because a covalent bond is when it only shares electrons and it doesn't give or lose.
Generally the low pitched sound vibrates the basilar membrane close to its apex while high pitched sound vibrates the basilar membrane close to its base
Brain receives information at temporal lobe. Thus, high and low pitched sounds are received at the higher and lower part of the temporal lobe.
Epistasis is the phenomenon where one pair of gene interacts
with a second pair to control its expression by masking, suppressing or
modifying it. <span>The
term meant that a different gene masks the phenotypic effect of another gene. Moreover,
epistasis has a large influence on the evolution of phenotypic traits. </span>
