In drosophila, which portion of the embryo at the blastoderm- stage will give rise to ectodermal, endodermal and mesodermal tissues?

#Question id: 5648

#Unit 5. Developmental Biology

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:

A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads

B: S. purpuratus sperm mixed with beads containing no ERB1 protein

C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads

D: S. franciscanus sperm mixed with beads containing no ERB1 protein

 What is a broader implication from the observations of the experiment?

#Question id: 7576

#General Aptitude

#Question id: 427

#Unit 1. Molecules and their Interaction Relevant to Biology

The degradation of which class of biochemicals does not significantly contribute to the release of energy to cells?

#Question id: 12918

#Unit 13. Methods in Biology

#Question id: 694

#Unit 1. Molecules and their Interaction Relevant to Biology

Thr and/or Leu residues tend to disrupt an alpha helix when they occur next to each other in a protein because: