What does it tell us about aging that cells from different organisms are capable of a fixed number of divisions in culture, and that number of divisions reflects the relative life-span of the organism?

#Question id: 5123

#Unit 5. Developmental Biology

The generation of specialized cell typces is called ‘differentiation’, a process during which-

#Question id: 5124

#Unit 5. Developmental Biology

Following statements are being made regarding conditional specification –

A. The process by which cells achieve their respective fates by interacting with other cells.

B. the cell “knows” very early what it is to become without interacting with other cells.

C. The critical factors that control cell fate are present and differentially segregated in the cytoplasm of these cells.

D. a cell becomes is specified by the array of interactions it has with its neighbors, which may include cell-to-cell contacts (juxtacrine factors), secreted signals (paracrine factors).

Which of the above statements are correct?

#Question id: 5125

#Unit 5. Developmental Biology

In above experiment in figure.A two differently positioned blastula cells are specified to become distinct muscle and neuronal cells.In figure.B when These two different blastula cells are placed together in culture. Following results are obtained according to step(1) and step(2). Which statement is correct about muscle cell commitment?

#Question id: 5126

#Unit 5. Developmental Biology

Which one is correct according to adult stem cell lineage?

#Question id: 5127

#Unit 5. Developmental Biology

The following are certain statements regarding stem cells. Which one is correct?

#Question id: 5128

#Unit 5. Developmental Biology

During lens formation in the Xenopus, the following statements have been proposed. Which statement is incorrect?