An isotope differs from another atom of the same element by its number of:  

Hydrogen bonds occur between:

_______ makes up the nucleus of an atom.  

The process by which organisms maintain a relatively stable internal environment is:

Information can be transmitted in living organisms by:    

Which one of the following carbohydrates is the most basic sugar?  

An example of inductive reasoning would be:    

In a water molecule, the oxygen atom is more electronegative than the hydrogen atoms, making the molecule:  

Which of the following is not part of Darwin’s theory of evolution?  

The atomic number of an element is determined by the number of: