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positive selection vector
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∙ 11y ago
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Alloreactivity is a positive selection step or negative selection step?
Neither. Alloreactivity has to do with a lymphocytes reacting to a foreign antigen. Positive and negative selection are processes of central tolerance which is to say that they deal with a T cell's ability to bind self-antigen.
T cells undergo positive selection in the thymus which means?
T cell undergoes maturation in the thymus and one of the tests it must pass to mature into a single positive mature naive T cell is positive selection. In positive selection your body is making sure that the T cell that it produces is reactive to your own MHC. If it cannot bind to your own MHC, the T cell is useless and it will just die by neglect in your thymus. In positive selection the T cell is "tickled" with thymic endothelial cells that express your own MHC class 1 and MHC class 2. If there is an affinity of the T cell to bind to your MHCs it will continue to the next step in maturation which is negative selection. If the T cell binds way too strongly to your MHC it will also die. There is a specific range that it must bind to your own MHC for it to continue.
Does thymic selection destroy MHC molecules?
The thymus goes through a positive and negative selection for T cells. T cells will respond to MHC class 1, either ignore if self or activate to destroy if foreign.
A vector quantity has direction a scalar quantity does not true or false?
True, a vector quantity has direction, and a scalar quantity does not.
Is a tree a biological vector?
No a tree is not biological vector because a biological vector is something that can spread some sort of a containgious virus.
How will you multiply a vector by positive number?
A positive scalar multiplied by a vector, will only change the vector's magnitude, not the direction. A negative scalar multiplied by the vector will reverse the direction by 180°.
Positive rotation of a vector is?
counterclockwise
What is meant by negative vector?
It is a vector that has the opposite direction to the reference positive direction. (A vector is one point in space relative to another.) Negative vector is the opposite direction
Is any quantity having a positive and negative values a vector?
No, vector, besides a value, has also a direction.
A vector a is along the positive z axis and it's vector product with another vector b is zero then vector b could be?
Vector b would be along the z axis, it could have any magnitude.
What is negative selection of immunology?
Immunology relies on both negative selection and positive selection. Negative selection, or non resultant, provides for discounting a method of treatment. Positive selection, or improvement can at times be found by elimination through negative selection.
What is the magnitude of an acceleration vector?
It is the positive square root of its length.
What is negative vector in physics?
That's a vector whose direction is exactly opposite to the direction that you designated as the positive one when the exercise or analysis began.
What is scaler quantities and vector quantities?
scalar quantity has only magnitude whereas vector quantity has magnitude as well as direction
What you the math terms for j?
A unit vector in the positive direction of the y-axis.
What equation finds the direction of the displacement vector?
In 2 dimensions the angle made by the displacement vector with the positive x-axis is arctan(y/x).
Can a body have negative speedwhy?
No. The speed is the length of the velocity vector, and that is always zero or positive.
