Briefly define an enzyme and its role in reactions.  Does it affect the activation energy or the free energy of the substrates?  Does it change an exergonic reaction into an endergonic reaction or vice versa?  Explain. [3 pts]

A fantasy element, Fluon (Fl), has two isotopes with the following masses and abundances.  Isotope Mass (amu) Abundance Fl-70 70 90% Fl-72 72 10% Choose the closest estimate to the average atomic mass of this element.

How does ATP drive endergonic reactions?  What happens to ATP during this process? [1 pt]

What is the endomembrane system in an animal cell?  List three cell structures that are part of it.  List a cell structure that is NOT a part of it. [1.5 pt]

What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) are mixed?

The elemental symbol for manganese is Mg.

A patient presents to the emergency room with symptoms of a stroke. He is unable to move his right arm. The stroke is damaging the neural tissue in which part of the brain?

An element is discovered that is solid at room temperature, has one valence electron, and readily forms a 1+ ion. This element is a….

What part of the brain contains the pneumotaxic center and apneustic centers?

Which of the following is considered a part of your “second line” of defense, as in your internal defenses.