A urine sample with more than 100,000 organisms is considered indicative of infection. A urine sample containing 5,000 bacteria, with a generation time of 30 minutes, sits for 3 hours before finally being assayed. How many bacteria will then be present within the sample

#Question id: 26552

#Unit 3. Fundamental Processes

If RNA have non-stop mutation then it sis degraded by

#Question id: 972

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the source of the carbon atoms 2 and 8 during de novo biosynthesis of purines?

#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: 2381

#Unit 2. Cellular Organization

During which phase of mitosis do the chromosomes arrange themselves across the center of the cell?

#Question id: 19162

#Unit 13. Methods in Biology