The tracheal (respiratory) system in Drosophila embryos develops from epithelial sacs. The approximately 80 cells in each of these sacs become reorganized into primary, secondary, and tertiary branches without any cell division or cell death. This reorganization is initiated when nearby cells secrete a protein called Branchless, which acts as a:

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#Question id: 18614

#Unit 13. Methods in Biology

The primer length affects the efficiency rate of PCR, this rate decreases as the primer length

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#Question id: 2740

#Unit 2. Cellular Organization

Escherichia coli use antisense regulation to switch the expression of outer membrane proteins. Antisense _____________.

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#Question id: 28769

#Unit 2. Cellular Organization

Autophagy occurs in the following sequence of steps___

a) Nucleation of autophagosome formation by ATG9

b) Digestion of the inner membrane and the luminal contents of the autophagosome.

c) Fusion of the autophagosome with lysosomes, catalyzed by SNAREs.

d) Induction by inhibition of mTOR complex 1

e) Closure of the membrane cup to form autophagosome

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#Question id: 14834

#Unit 5. Developmental Biology

Process by which a spatial and temporal pattern of cell activities is organized within the embryo so that a well-ordered structure develops:

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#Question id: 28409

#Unit 5. Developmental Biology

Which of the following organizer proteins that involve inhibiting the Wnt proteins during gastrulation?