TLS Online TPP Program

#Question id: 2003


The number of MHC protein combinations possible in a given population is enormous. However, an individual in that population has only a couple of MHC possibilities. Why?

#Unit 4. Cell Communication and Cell Signaling
  1. The MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways.

  2. MHC proteins from one individual can only be of class I or class II.

  3. Each of the MHC genes has a large number of alleles, but each individual only inherits 2 for each gene.

  4. Once a B cell has matured in the bone marrow, it is limited to two MHC response categories.

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TLS Online TPP Program

#Question id: 19076

#Unit 6. System Physiology – Plant

Pathogen Pseudomonas  produces toxins which causes avirulence, known as

TLS Online TPP Program

#Question id: 19077

#Unit 4. Cell Communication and Cell Signaling

Race between effector and ETI evolution between plants and pathogens is an example of___

TLS Online TPP Program

#Question id: 19077

#Unit 6. System Physiology – Plant

Race between effector and ETI evolution between plants and pathogens is an example of___

TLS Online TPP Program

#Question id: 19078

#Unit 4. Cell Communication and Cell Signaling

Avirulence (Avr) genes, they are recognized by a cognate resistance gene. The Pseudomonas AvrPto effector causes avirulence on tomato (Solanum lycopersicum) because they carry__

TLS Online TPP Program

#Question id: 19078

#Unit 6. System Physiology – Plant

Avirulence (Avr) genes, they are recognized by a cognate resistance gene. The Pseudomonas AvrPto effector causes avirulence on tomato (Solanum lycopersicum) because they carry__

TLS Online TPP Program

#Question id: 19079

#Unit 4. Cell Communication and Cell Signaling

Pathogen evades plant by penetration of surface layers directly using mechanical pressure or enzymatic attack, some pass through natural openings, such as stomata or lenticels, and others only enter through wounded tissue. Once inside the plant, one of three main attack strategies is deployed specific feature of interaction given;
A) Necrotrophy
B) Biotrophy
C) Hemibiotrophy
i) where the plant cells remain alive throughout infection
ii) where the plant cells are killed in advance of infection 
iii) extensive plant tissue damage at initial stages
iv) where the pathogen initially keeps cells alive but at later stages of the infection, kills them
Match the following