An investigator incubates an unprocessed RNA molecule containing an intron in an extract absent of any protein. Correct splicing of the RNA is observed, but only when guanosine is present. What can the investigator conclude about the RNA molecule?

a. It contains a ribozyme. 

b. Self-splicing has occurred.

c. It contains a group II intron.

d. It contains a group I intron.

TLS Online TPP Program

#Question id: 28395

#Unit 5. Developmental Biology

One of the genes activated by VegT protein encodes the Sox17 transcription factor , these sox17 transcription factor is critical for which functions?

TLS Online TPP Program

#Question id: 28396

#Unit 5. Developmental Biology

VegT is critical in generating the germ cells, two genes activated by VegT protein that encodes the transcriptional factor as well as paracrine factors that instruct the cell layers to become their fate. which of the following statements is incorrect?

a) Sox17 paracrine factor that specify cells to be endoderm

b) Nodal transcription factors that instruct the cell layers above them to become mesoderm

c) Nodal paracrine factors that instruct the cell layers above them to become mesoderm

d) Sox17 transcription factor that specify cells to be endoderm

TLS Online TPP Program

#Question id: 28397

#Unit 5. Developmental Biology

During the specification of amphibian axes, in the absence of any induction cell leads to become which of the following fate?

TLS Online TPP Program

#Question id: 28398

#Unit 5. Developmental Biology

Spemann referred to the dorsal lip cells and their derivatives as the organizer, these derivatives cells are___

TLS Online TPP Program

#Question id: 28399

#Unit 5. Developmental Biology

Dorsal most vegetal cells of the blastula, which are capable of inducing the organizer is known as____

TLS Online TPP Program

#Question id: 28400

#Unit 5. Developmental Biology

Which of the following is the major candidate for the factor that forms the Nieuwkoop center ?