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Alloreactivity is a positive selection step or negative selection step?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
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Successful reproduction is the fourth step of selection?
the 4th step of natural selection
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.
How would you describe the gram stain?
Describe the Gram stain technique and the effect on Gram-positive and Gram-negative bacteria after each step. Be very specific about what is happening at each step and why it happens. (hint: be sure to fully explain your answer and not just list the steps)
Successful reproduction is the fourth step of what selection?
Altraun unscramble that word
Which step is most crucial or most likely to cause poor results in the gram stain?
Gram staining is a type of differential staining in which two types of bacteria are differentiated on the basis of their cell wall either gram positive or gram negative although all the steps in gram staining are crucial, the most important step the most crucial step in the performance of the Gram staining procedure is the decolorization step which is the Acid-Alcohol (3% HCl and 95% Ethanol) and must be timed correctly; the crystal violet stain will be removed from both Gram-positive and negative cells if the decolorizing agent is left on too long (a matter of seconds).
What is the first step of material charge?
positive and negative
What is 40 divided by minus 10?
30
Step by Step how to multiply negative numbers?
how to multiply negative numbers. 1. multiply the two numbers and first forget about the negative or positive signs. 2. Now look at the signs, if both numbers you multiplied were negative the answer is positive so what you have in step 1 above is the answer, if not, go to step 3. 3. One number is positive and one is negative so take your answer in step one and put a negative sign in front of it. 4. If there are more than 2 numbers, group them by pairs any way you want and follow this step by step for each pair.
What happen when you divide negative and positive number?
When you divide or multiply positive and negative numbers, you first do the division or multiplication as normal. The next step is to assess whether or not the answer will be negative or positive. If the two numbers of the question were the same (negative and negative or positive and positive) then the answer will be positive. If the two numbers in the question were different (one negative and one positive) then the answer will be negative. Thus, if you divide a negative number by a positive number, the result will be the same as normal division, but the answer will be negative.
Which step in the gram stain is the critical step in differentiating gram positive cells from gram negative cells?
Alcohol-acetone
What is negative 100 divided by negative 4?
25
What is Tests for Persistent Directional?
Mean step size - Number of positive and negative changes.
What is rule of addition of integers?
Rule: The sum of two negative integers is a negative integer.Rule: The sum of two positive integers is a positive integer.Procedure: To add a positive and a negative integer (or a negative and a positive integer), follow these steps:1. Find the absolute value of each integer.2. Subtract the smaller number from the larger number you get in Step 1.3. The result from Step 2 takes the sign of the integer with the greater absolute value.
How do you multiply a negative number with a positive fraction?
It is easiest to think about the signs of the numbers separately from their values (as though the numbers were positive):First consider the signs:Multiplying positive by positive => result is positiveMultiplying positive by negative => result is negativeMultiplying negative by positive => result is negativeMultiplying negative by negative => result is positiveOr to summarise:If the numbers are the same sign (both positive or both negative) the result is positive.If the numbers are of opposite signs (one positive, one negative) the result is negative.Then multiply the values of the two numbers together (multiply them as though both were positive) and put the sign on the result as decided above.eg to multiply -24 by 3:negative times positive => result negative (different signs)24 x 3 = 72sign found in step 1 to be negative, so -24 x 3 = -72eg to multiply -15 by -1/3negative times negative => result positive (same signs)15 x 1/3 = 5sign found in step 1 to be positive, so -15 x -1/3 = 5eg to multiply 12 by -1/4positive times negative => result negative (different signs)12 x 1/4 = 3sign found in step 1 to be negative, so 12 x -1/4 = -3.
Successful reproduction is the fourth step of selection?
the 4th step of natural selection
What is the first step in naming an ionic compound?
give the positive charge a name determine the name of the negative ion
What does 2 times negative 4 times negative 7 equal and why?
In order to multiply two numbers together when one or more of them is negative, you start by multiplying them normally. In this case 4x7 = 28. The next step is to assess whether or not the answer is a negative or positive. If the two numbers being multiplied were the same (both negative or both positive) then the answer is positive. Otherwise, it is negative. In this case, we had -4 and -7 which are both negative, so the answer is positive 28. Thus the question can be rewritten as 2x28. This comes out as 56. Therefore 2 times negative 4 times negative 7 is 56.
