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TLS Online TPP Program

#Question id: 7177

Following statements are regarding to the early development in nematodes. Which of the following is incorrect?

#Unit 5. Developmental Biology
  1. At the 4-cell stage, the EMS cell requires a signal from its neighbor (and sister cell), the P2 blastomere. Usually, the EMS cell divides into an MS cell (which produces mesodermal muscles) and an E cell (which produces the intestinal endoderm).
  2. If the P2 cell is removed at the early 4-cell stage, the EMS cell will divide into two E cells, and endoderm will be produced.
  3. If the EMS cell is recombined with the P2 blastomere, however, it will form endoderm; it will not do so, however, when combined with ABa, ABp, or both AB derivatives.
  4. Specification of the MS cell begins with maternal SKN-1 activating the genes encoding transcription factors such as MED-1 and MED-2. 
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TLS Online TPP Program

#Question id: 26883

#Unit 10. Ecological Principles

Fast generation and high mutation rate in tropical leads to
TLS Online TPP Program

#Question id: 19098

#Unit 4. Cell Communication and Cell Signaling

Quorum sensing in E. carotovora is mediated by
TLS Online TPP Program

#Question id: 5535

#Unit 5. Developmental Biology

What type of animal forms a trophoblast for the duration of its early development?
TLS Online TPP Program

#Question id: 4658

#Unit 11. Evolution and Behavior

Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same function. Which information would best help distinguish between an explanation based on homology versus one based on convergent evolution?
TLS Online TPP Program

#Question id: 14079

#Unit 1. Molecules and their Interaction Relevant to Biology

Which DNA is favored in many solutions that are relatively devoid of water with the base pair per turn of
A. B DNA
B. A DNA
C. Z DNA
D. 10 bp per turn
E. 11 bp per turn
F. 12 bp per turn
Which of the following combination is correct?