The processes by which the three ectodermal regions are made physically and functionally distinct from one another is called neurulation. Following statements are regarding to the mechanism of neurulation.

A. The specification of the ectoderm is accomplished during gastrulation, primarily by regulating the levels of BMP experienced by the ectodermal cells.

B. High levels of BMP specify the cells to become neural plate.

C. Very low levels specify the cells to become epidermis.

D. Intermediate levels effect the formation of the neural crest cells.

Which of the following combination is correct?

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#Question id: 28301

#Unit 5. Developmental Biology

 Sperm rheotaxis in case of mammal involve migration against the direction of flow by using sensing mechanism. which of the following is correct monitoring the direction of the current?

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#Question id: 1063

#Unit 4. Cell Communication and Cell Signaling

A key feature of all viral infections is the

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#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

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#Question id: 23578

#Unit 8. Inheritance Biology

During chromosomal rearrangements are one way in which new genes evolve which is

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#Question id: 269

#Unit 1. Molecules and their Interaction Relevant to Biology

Which type of RNA is the most abundant in living cells (by percent)?