Question: A red blood cell has an internal salt concentration of 150mM. The cell is placed in a beaker of 500mM salt. (a) Suppose that the cell membrane is permeable to water but not to ions, decribe what will happen to the cell in terms of osmosis. (b) If the membrane […]

You are studying genes and DNAsequences involved in the regulation of the grandoperon.When your lab’s strain of e. coli are in the presence of the sugar “grandiose,” transcription of two enzymes grandAand grandB increases. You have generated a series of deletion mutants (strains a-e), all of which affect transcription from this operon. You are able to measure the production of the two […]

Cytokinesis-the actual process of cell division-has attracted theorists for well over 100 years. It has been said that all possibleexplanations of cytokinesis have been proposed; the problem is to decide which one is correct. Consider the following three hypotheses: 1. Chromosome signaling: When chromosomes split at anaphase, they emit a […]

Biology class. Must cite work, must be 250 words. YouTube URL: http://www.youtube.com/watch?v=rjza24Oyalc Dieters often talk about their metabolism. What is metabolism? Catabolism? Anabolism? Total metabolic rate (TMR)? Basal metabolic rate (BMR)? Is having a higher metabolic rate a good thing? Does a high metabolic rate promote aging? What factors contribute […]