Anatomy and physiology chapter 2

Covalent bonds form when

• Two or more molecules share electrons unequally

• Two or more atoms share electrons equally

• A positive ion and a negative ion attract

• Two or more atoms share electrons equally and two or more molecules share electrons unequally

To form an ion, an atom must either donate or receive a(n)

• Electrons and neutrons

• Electron

• Neutron

• Proton

Hydrogen bonds occur between

• Polar molecules

• Ions and nonpolar molecules

• Multiple ions

• Nonpolar molecules

About 96% of the body, consists of what 4 elements?

• Oxygen, hydrogen, glucose, and carbon

• Oxygen, hydrogen, carbon, and copper

• Oxygen, hydrogen, carbon, and nitrogen

• Oxygen, hydrogen, carbon, and sodium

A saturated fat will have

• Significant numbers of carbon-carbon double bonds

• Excessive nutrients

• No carbon to carbon double bonds

• very few hydrogen atoms

The difference between DNA and RNA is that

• Each has different bases

• There are differences in sugars, bases, and the number of strands

• Each contains different sugars

• Each has a difference in the number of strands

When one atom donates an electron to another atom, the donating atom becomes a | | charged ion and the receiving atom becomes a | | charged ion. These ions are joined together by a/n | | Chemical bond

• Positively; negatively; ionic

• Negatively; positivity; covalent

• Positivity; negatively; hydrogen

• Negatively; positively; ionic

Which of the following is an organic substance?

• C6H12O6

• NaHCO3

• CO2

• NaOH

On the typical pH scale, a pH of | | indicates the lowest concentration of hydrogen ions, whereas a pH of | | indicates the highest concentration of H+

• 0; 14

• 7; 14

• 14; 0

• 0; 7

When the body has excess energy and builds molecules to store it, which molecules do we build the MOST?

• Triglycerides

• Glycogen

• Glucose

• Cholesterol