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TLS Online TPP Program

#Question id: 26389

Choose which of the following statement regarding the licensing factor is incorrect

#Unit 3. Fundamental Processes
  1.  Licensing factor is necessary for initiation of replication at each origin.
  2.  Licensing factor is present in the nucleus prior to replication, but is removed, inactivated, or destroyed by replication
  3.  Initiation of another replication cycle becomes possible only after licensing factor reenters the nucleus after mitosis
  4.  Initiation of another replication cycle becomes is possible without reentering the licensing factor into nucleus after mitosis.
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TLS Online TPP Program

#Question id: 14699

#Unit 13. Methods in Biology

If A and B are arbitrary events, then
TLS Online TPP Program

#Question id: 14700

#Unit 13. Methods in Biology

One mapping is selected at random from all the mappings from the set S = {1,2,3,...n} into itself. The probability that the selected mapping is one to one is
TLS Online TPP Program

#Question id: 14706

#Unit 5. Developmental Biology

Match the types of cell movement during gastrulation
TLS Online TPP Program

#Question id: 14707

#Unit 5. Developmental Biology

Which of the following organ belongs to the internal layer of gastrula?
TLS Online TPP Program

#Question id: 14708

#Unit 5. Developmental Biology

Difference between gastrulation in Xenopus and sea urchin;
I. In Xenopus, formation of blastopore: mesoderm and endoderm move inside by involution over blastopore lip.
II. In sea urchin, formation of blastopore: mesodermal cells migrate into the interior; endoderm moves inside by invagination of the epithelial sheet.
TLS Online TPP Program

#Question id: 14709

#Unit 5. Developmental Biology

Choose right statement about cleavage pattern and gastrulation movements;
1.At the end of cleavage the animal embryo is essentially a closed sheet of cells, which is often in the form of a sphere enclosing a fluid-filled interior. Gastrulation, strictly the formation of the gut, converts this sheet into a solid three-dimensional embryonic animal body. 
2.During cleavage, cells move into the interior of the embryo, and the regions of endoderm. and mesoderm. which were originally adjacent in the cell sheet, take up their appropriate positions in the embryo.
3. Gastrulation results from a well- defined spatio-temporal pattern of change in cell shape, cell movement, and change in cell adhesiveness, the main forces of which are generated by localized contractions.