If a radioimmunoassay is properly conducted and the amount of radioactive hormone bound to antibody is low, this would indicate which of the following?

#Question id: 33244

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 11052

#Unit 10. Ecological Principles

An example of territoriality is

#Question id: 7698

#Unit 9. Diversity of Life Forms

Which tree shows the greatest evolutionary distance between chytrids and ascomycetes?

#Question id: 1384

#Unit 4. Cell Communication and Cell Signaling

Mutations that block expression of the E-cadherin gene are thought to be an important step in metastasis. To better understand how loss of E-cadherin contributes to metastasis, scientists created two cell lines that differed in their expression of E-cadherin. One cell line expressed normal E-cadherin, but at 10% of the usual levels. The other cell line expressed normal E-cadherin at the usual levels, and also, at high levels a mutant form that included the cytoplasmic domain but lacked the rest of the protein. Both cell lines exhibited strongly reduced cell adhesion in culture. However, only the cell line with reduced expression of normal E-cadherin metastasized when introduced into mice.

Which of the following hypotheses is most consistent with the observations on cell adhesion and metastasis in these cell lines?

#Question id: 24672

#Unit 2. Cellular Organization

Which statement describes the mode of action of the ABCB1 transporter (the first eukaryotic ABC transporter to be recognized)?