A mechanism for preventing sap loss entails closing sieve plate pores with callose, which is

TLS Online TPP Program

#Question id: 1671

#Unit 4. Cell Communication and Cell Signaling

A chromosome on which T-cell receptor α chain gene rearrangement has occurred lacks which of the following gene segments?

TLS Online TPP Program

#Question id: 1672

#Unit 4. Cell Communication and Cell Signaling

Using only random VDJ recombination, from 40 V, 23 D, and 6 J gene segments, what are the number of possible variable regions of an antigen receptor molecule?

TLS Online TPP Program

#Question id: 1673

#Unit 4. Cell Communication and Cell Signaling

N-region insertion is associated with the expression of:

TLS Online TPP Program

#Question id: 1674

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of receptor editing?

TLS Online TPP Program

#Question id: 1675

#Unit 4. Cell Communication and Cell Signaling

Somatic hypermutation of V genes:

TLS Online TPP Program

#Question id: 1676

#Unit 4. Cell Communication and Cell Signaling

NK cells lack receptors with: