#Question id: 22951
#Unit 5. Developmental Biology
#Question id: 1570
#Unit 4. Cell Communication and Cell Signaling
Which cells and which signaling molecules are responsible for initiating an inflammatory response?
#Question id: 19273
#Unit 9. Diversity of Life Forms
#Question id: 28236
#Unit 5. Developmental Biology
One of the mechanism of stem cell regulation is Extracellular mechanisms which involve physical as well as chemical regulation. which of the following prediction is incorrect about the Physical mechanisms ?
#Question id: 3820
#Unit 3. Fundamental Processes
Meselson and Stahlʹs experiments involved growing E. coli on a medium containing 15N (heavy nitrogen) which increased the density of the bacterial DNA. Cells were then grown on a medium containing only 14N. DNA samples were obtained for analysis after one, two and three rounds of replication (generations) and centrifuged on a density gradient. The double-helical DNA forms bands in the gradient depending on its density. How many bands did Meselson and Stahl see after two generation of cells were grown on the 14N medium?