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If the atomic number of helium is 2, and the atomic mass of helium is 4.003, how many electrons are in helium?

What changes between different types of amino acids?

Is a chlorine atom reactive or non-reactive? (The first energy shell has 2 electrons, the second energy shell has 8 electrons, and the valence energy shell has 7 electrons).

Match the abbreviation with its meaning: 

What is the primary difference between ionic and covalent bonding?

Which macromolecule stores genetic information?

Which of the following is the BEST description of hydrolysis?

Using the experiment that is described in Question #22, what are the constants in the experiment?

Using the image of the microscope or your knowledge of a microscope, what is the name of the part of the microscope that can adjust the width/size of light that comes into the specimen? (This is part I in the image):

Using the experiment that is described in Question #20, what is the independent variable?