A group of scientists studying fertilized sea urchin eggs fi…

A group of scientists studying fertilized sea urchin eggs finds that a protein appeared and disappeared in these eggs. The degradation of this protein occurs about the same time as the cells finalized the first and second mitotic divisions. They are probably observing _____

In colder weather, a bird’s cells would need to ____________…

In colder weather, a bird’s cells would need to __________________ in order to maintain membrane fluidity Increase incorporation of unsaturated fatty acids Decrease incorporation of unsaturated fatty acids Increase the proportion of double bonds in the membrane lipids Decrease the proportion of double bonds in the membrane lipids Increase the activity of desaturases

In the diagram below, there is at least one example of a fir…

In the diagram below, there is at least one example of a first messenger one example of a second messenger and one example of an effector.  These examples include a first messenger like ____________, a second messenger like __________ and an effector like __________.