When an action potential from a motor neuron arrives at the neuromuscular junction, a series of events occurs that leads to the contraction of the skeletal muscle cell. Which of the following events occurs last?  (Hint: put these events in the correct order first, so you can easily decide which event occurs last.)

If the observed f(RR)=0.3, f(Rr)=0.2, and f(rr)=0.5, what is f(r)? (Note: a calculator is available in Canvas, or on the the classroom’s counter, if you’d like to use one.)

During an action potential, the local axon membrane repolarizes from +40 mV to -75 mV because of:

FILL-IN: In the eggs of Class Reptilia and Class Mammalia, what is the function of the amnion (an extra-embryonic membrane within the amniotic egg)? Answer in a few words.  

Which of the following statements about skeletal muscle cells and cardiac muscle cells is FALSE?

Genetic drift acts most strongly in:

In general, what are globular proteins used for in the body? (1 pt)

113. Why are lipids strongly non-polar? (1 pt)

There are two types of population regulation factors.  Consider these two examples. The population of deer living in a forest will decrease in a forest fire no matter how many deer are living in the forest . Competition for nesting space increases when the population of birds increase, which may decrease the bird population growth.  The forest fire is an example of a(n) _______________ factor, while the nesting space is an example of a(n) ________ factor.

Toxic chemicals from factories dumped into the ocean makes marine organisms sick and leads to a decline in biodiversity.  What kind of threat to biodiversity is this?