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TLS Online TPP Program

#Question id: 2023

Which of the following is a pathway that would lead to the activation of cytotoxic T cells?

#Unit 4. Cell Communication and Cell Signaling

  1. B cell contact antigen → helper T cell is activated → clonal selection occurs

  2. body cell becomes infected with a virus → new viral proteins appear → class I MHC molecule-antigen complex displayed on cell surface

  3. self-tolerance of immune cells → B cells contact antigen → cytokines released

  4. complement is secreted → B cell contacts antigen → helper T cell activated → cytokines released

More Questions
TLS Online TPP Program

#Question id: 10412

#Unit 6. System Physiology – Plant

Red and far-red lights are perceived by plants through various photoreceptors including phytochromes. The red/far-red reversibility of seed germination was due to the-
a) photoreversibility of phytochrome
b) presence of red and far-red light at different fluence rate
c) Conversion of Pr to Pfr form through the effect of red light
d) equal proportion of red and far red light at same fluence rate
Which of the following combinations is correct?
TLS Online TPP Program

#Question id: 5536

#Unit 5. Developmental Biology

Which of the following is not related with the spot of invagination during gastrulation?
TLS Online TPP Program

#Question id: 17671

#Unit 9. Diversity of Life Forms

Protection from predators 
TLS Online TPP Program

#Question id: 24325

#Unit 4. Cell Communication and Cell Signaling

The principal ECM adhesion receptor in epithelial hemidesmosomes is;
TLS Online TPP Program

#Question id: 4655

#Unit 11. Evolution and Behavior

Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?