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: 18580

#Unit 7. System Physiology – Animal

Which of the following can be a source of internal or external stress?

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#Question id: 26902

#Unit 10. Ecological Principles

Which characteristics are considered the species that are more prone to extinction?

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#Question id: 1992

#Unit 4. Cell Communication and Cell Signaling

How do antibodies of the different classes IgM, IgG, IgA, IgD, and IgE differ from each other ?

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#Question id: 262

#Unit 1. Molecules and their Interaction Relevant to Biology

Changes in the topology and three-dimensional shape of B-DNA can result from

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#Question id: 7756

#Unit 5. Developmental Biology

Which of the following is serves to regulate the ATG9 membrane shuttle system?