Life on Earth - Biological Concepts from the Non-Science Major Perspective

Do indoor plants create oxygen as a by-product the same way in which outdoor plants do (through photosynthesis)? Is there any advantage to having plants in your house, other than for decor? Does the oxygen provide any added benefit? Does is provide cleaner air to breath?

RBC's

RBC's are permeable to urea, does this have any physiological significance?

RBC

What would happen if a person was intravenously injected with distilled water instead of isotonic saline? And how would haemolysis rates change of a person who hand sickle cell disease?

extent of connection of nuclear envelope and ER

In what sense can I claim that the inner surface of the nuclear envelope, the ER, of vesicles and of the Golgi cisternae are actually contigous with the outside of the cell.

Protein expression / Pulse-chase

I want to study a human protein(protein X) that is normally secreted from the cell. I express the gene for Protein X in cultured Rat cells. I conduct a pulse-chase experiment in which I specifically label Protein X(and no other cellular protein) at 37 degrees celcius and then perform a 35 minute chase also at 37 degrees celcius. I follow protein X's intracellular distribution during subcellular fractionation on a density gradient. Panel (a) shows the result immediatley after the pulse. Panel (b) shows the result after 35 minutes of chase. I dont understand what is happening going from panel A to panel B I want to know how panel (b) would look if I attacheed a KDEL sequence to the gen... click for more