If a naive T cell recognizes an antigen-MHC complex on an appropriate antigen-presenting cell or target cell, it will be activated, initiating :
a primary response
A naive T cell is a mature T cell that has left the thymus but has never met its specific antigen.
When its T-cell receptor recognizes the peptide–MHC complex on a suitable antigen-presenting cell (with co-stimulation), the naive cell is activated, proliferates (clonal expansion) and differentiates into effector and memory cells. This first exposure response is the primary immune response, which is slower and weaker.
A secondary response is produced by memory cells on a later exposure to the same antigen, so it cannot be started by a naive cell. Prophylactic response is not an immunological response category, and mast cell degranulation is triggered by allergen cross-linking of IgE bound to Fc receptors, not by T-cell recognition.
Hence, a primary response.
Similar Questions
DNA is supercoiled state can be relaxed by an enzymatic process. Which enzyme catalyses relaxation of supercoiled DNA?
Adaptive radiation produced numerous lineages from reptiles during chordate evolution. One of the following gave rise to mammals:
Which one produces highest isotope effect?
Which one of the following conditions is true for parthenogenesis?
The urge to inhale in human being results from:
Which of the following is responsible for triggering formation of other enzymes?
Which of the following is critical for differentiation of bipotential gonads towards ovarian pathway?
The PCR technique that allows measuring of DNA amplification at each cycle of PCR rather than the end point detection is:
Abscisic acid responsive elements (ABREs) are over-represented in promoter of genes involved in ............
In humans pointed eyebrows are dominant over smooth eyebrows and downward pointed frontal hairline is dominant over continuous hairline. What phenotypic ratio would you expect in the offspring from a cross between an individual heterozygous for both genes and an individual homozygous recessive for both genes?
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
