Indicate true (T) and false (F) statements below regarding developmental timing in animals. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTT.
( ) Cell-division cycles generally serve as an intracellular timer that controls the timing of cellular differentiation.
( ) Developmental transitions are often regulated by microRNAs.
( ) Intracellular developmental programs are often followed even if the cells are taken from the developing embryo and maintained in culture.
( ) Timing of developmental transitions can be coordinated by cell-cell interactions as well as globally by hormones.

Question

Indicate true (T) and false (F) statements below regarding developmental timing in animals. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTT.
( )	Cell-division cycles generally serve as an intracellular timer that controls the timing of cellular differentiation.
( )	Developmental transitions are often regulated by microRNAs.
( )	Intracellular developmental programs are often followed even if the cells are taken from the developing embryo and maintained in culture.
( )	Timing of developmental transitions can be coordinated by cell-cell interactions as well as globally by hormones.

Quizplus · Accepted Answer

Cells rarely count cell divisions to time their development. In many cases, intracellular developmental programs help determine the time course of a cell's development, allowing it to step through more or less the same program whether it is within the embryo or in culture. The timing of developmental transitions can also be coordinated by cell-cell interactions and a global coordinating signal. The transitions are often regulated and sharpened by microRNAs in the cell.

Indicate True (T) and False (F) Statements Below Regarding Developmental