T cell receptor, Cytotoxic T Cell, CD4, Antigen, Bacterium,
B – cell, Cell mediated response, Class II MHC, Cytokines, and Humoral Response
are the components for the activation of a helper t cell by a dendritic cell.
Answer:The nitrogen present in the soil is not directly used by the bacteria. It can be used only when the nitrogen is converted into usable form. These bacteria convert atmospheric nitrogen into ammonia, then nitrite which is then converted into nitrate. This nitrate is used by the roots of the plants like soybeans and peas. This is the role of bacteria present in the roots of the plant to convert atmospheric nitrogen into usable form that can be used by plants.
Explanation:
Answer:
The parietal bone has not articulated with zygomatic bone.
Explanation:
Parietal bones are paired structure that form the roof and side of the cranium.
The parietal bones are articulated with each other and form suture.
It articulates occipital bone posteriorly,and anteriorly with the frontal bone which form a suture called as coronal suture.
Inferiorly the parietal bone is articulated with sphenoid and temporal bone.
Zygomatic bone is irregular shaped and paired structure that articulates with maxilla.temporal bone, sphenoid bone,frontal bone.
A watershed describes an area of land that contains a common set of streams and rivers that all drain into a single larger body of water, so stagnant water in a swamp
Answer:
A
Explanation:
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