Practice Questions

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#Question id: 11163

The reason that paralogous genes can diverge from each other within the same gene pool, whereas orthologous genes diverge only after gene pools are isolated from each other, is that

#XL - S Microbiology

having multiple copies of genes is essential for the occurrence of sympatric speciation in the wild.
paralogous genes can occur only in diploid species; thus, they are absent from most prokaryotes.
polyploidy is a necessary precondition for the occurrence of sympatric speciation in the wild.
having an extra copy of a gene permits modifications to the copy without loss of the original gene product.

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TLS Online TPP Program

#Question id: 1748

#XL - Q Biochemistry

Which of the folllowing is a cytokine receptor that is a member of the hematopoietin receptor family?

TLS Online TPP Program

#Question id: 1749

#XL - Q Biochemistry

The αβ heterodimeric form of the IL-2 receptor:

TLS Online TPP Program

#Question id: 1750

#XL - Q Biochemistry

IFNγ and TNF (TNFα) can act synergistically:

TLS Online TPP Program

#Question id: 1751

#XL - Q Biochemistry

Which of the following is characteristically produced by the Th2 CD4 cells which provide help for antibody production, but not by Th1 cells?

TLS Online TPP Program

#Question id: 1752

#XL - Q Biochemistry

Dendritic cells can be driven from a resting state to an activated state by the T-cell surface molecule:

TLS Online TPP Program

#Question id: 1753

#XL - Q Biochemistry

In the germinal center, B-cells become memory cells under the influence of: