BETWEEN STEM CELL DIVISIONS AND FINAL DIFFERENTIATED CELL TYPES, CELLS UNDERGO S

Question

BETWEEN STEM CELL DIVISIONS AND FINAL DIFFERENTIATED CELL TYPES, CELLS UNDERGO SEVERAL _____ STEPS

A. INDUCTIVE

B. TRANSDUCTION

C. TRANSIT MODIFICATION

D. TRANSIT AMPLIFICATION

STEM CELLS IN THE INTESTINE ARE LOCATED IN THE

A. PRICKLE CELL LAYER

B. APEX OF THE BILLI

C. BASAL-LATERAL ASPECT OF THE CRYPT

D. INNER PLEXIFORM LAYER

E. OUTER PLEXIFORM LAYER

THE DELTA-NOTCH SYSTEM LEADS TO ________ INHIBITION IN A FIELD OF CELLS.

A. TRANSIENT

B. COMMUNAL

C. LATERAL

D. THE ELIMINATION OF

E. NONE OF THE ABOVE

Explanation / Answer

Between stem cell divisions and final differentiated cell types, cells undergo several transit amplification steps. They are positioned in between stem cells and differentiated progeny. Transit amplification can be described by the limited division by stem cells, to produce transit amplifying cells.This transit amplifying cells then proliferate largely and leads to formation of various differentiated type of cells. So, they serve as a linker between undifferentaited stem cells and differentiated cells. Hence, option D. is correct.

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