Why is there a maximum size that a cell can reach?

Isoleucine production from threonine is tightly controlled.  How is this process regulated?  What feedback mechanism is used?  Which enzyme is the key regulatory enzyme in the production of isoleucine?  What causes the inhibition to stop?

What is cooperativity and give an example of cooperativity discussed in the lesson.

What is the net product of one pyruvate molecule that enters and completes the citric acid cycle?

Which keyword matches this definition: Glandular stomach of avians where gastric juices and hydrochloric acid are secreted.

The duodenum is part of the:

Briefly explain how Sarin nerve gas works.  Which cells in the body are affected?  Which enzyme does it specifically affect and how does that affect the body?  How does it affect the enzyme (what is the mechanism of its action)?

What do we mean when we call the Thalamus the “gatekeeper”? What would happen if the Thalamus were unable to perform this function?

The cardiac center and vasomotor center are located in the  

If a patient is unable to coordinate the complex activities involved in producing speech, what part of their brain is most likely damaged?