Scientists have found that the lifetimes of mRNAs coding for pair-rule regulatory elements in Drosophila embryos may be measured in minutes.What does this suggest about the overall developmental plan of an animal body?
A)mRNAs in general have short lifetimes;this is not a surprising finding.
B)Each segment specified by pair-rule mRNAs is completely determined in the embryo in a very short time.
C)Building an animal body requires a sequence of steps;each of these steps is precisely timed.
D)Timing of pair-rule sequence determination is not as important as spatial signaling.

Question

Quizplus · Accepted Answer

The short lifetimes of mRNAs suggest that the developmental process is tightly regulated and requires precise timing for each step in the sequence of building an animal body.

Scientists Have Found That the Lifetimes of MRNAs Coding for Pair-Rule