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TLS Online TPP Program

#Question id: 289

Which of the following statements describes a covalent bond between Carbon and Hydrogen:

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. The electrons are shared equally between the two atoms of the bond.

  2. The electrons of the bond are pulled closer to the nucleus of Hydrogen, because its outer shell electron is closer to its nucleus than the outer shell electrons of Carbon are to its nucleus.

  3. The electrons of the bond are pulled closer to the nucleus of Hydrogen, because its nucleus contains more protons than Carbon.

  4. The electrons of the bond are pulled slightly closer to the nucleus of Carbon, because although its outer shell electrons are located farther away from the protons of its nucleus, it contains more protons than Hydrogen.

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TLS Online TPP Program

#Question id: 15336

#Unit 4. Cell Communication and Cell Signaling

Which of the following cell surface markers responsible for the regulation of B-cell ?
TLS Online TPP Program

#Question id: 15337

#Unit 4. Cell Communication and Cell Signaling

HSCs express which type of cell-surface molecule, which is the receptor for stem cell factor (SCF). It is a cytokine that exists in both membrane-bound and soluble forms and the SCF-surface molecules interaction is critical for the development, in adult animals, of multipotential progenitor cells (MPPs).  Which type of surface molecules HSCs express?
TLS Online TPP Program

#Question id: 15338

#Unit 4. Cell Communication and Cell Signaling

Which cell generated on the receipt of SCF/c-Kit signaling lose the capacity for extensive self-renewal, but retain the potential to differentiate into several different hematopoietic lineages and also transiently express the molecule CD34?
TLS Online TPP Program

#Question id: 15339

#Unit 4. Cell Communication and Cell Signaling

HSCs begin their life in close contact with osteoblasts located close to the lining of the endosteal cavity. Once differentiated to the pre-pro-B-cell stage, the developing B cells require Which type of signals from the chemokine, which is secreted by a specialized set of stromal cells?
TLS Online TPP Program

#Question id: 15340

#Unit 4. Cell Communication and Cell Signaling

Serrogate light chain formation takes place in 
TLS Online TPP Program

#Question id: 15341

#Unit 4. Cell Communication and Cell Signaling

Formation of pre B-cell  describing__
A. Surrogate light chain formation 
B. On these surface present IgM
C. Heavy chain had been formed
D. DJ H chain recombination