Biochemistry Quiz

What percentage of the human body is composed of oxygen?

• 45%

• 55%

• 65%

• 75%

What is matter?

• Anything that has mass only

• Anything that occupies space only

• Anything that has mass and occupies space

• Anything that can be seen

Which of these is an element?

• Water

• Carbon dioxide

• Oxygen

• Salt

What are the three main subatomic particles?

• Protons, electrons, atoms

• Protons, neutrons, electrons

• Neutrons, atoms, electrons

• Atoms, molecules, electrons

Where is most of an atom's mass located?

• In the electrons

• In the nucleus

• In the electron shells

• Evenly distributed throughout

What determines the identity of an element?

• Number of neutrons

• Number of protons

• Number of electrons

• Atomic mass

What is the atomic number?

• Number of protons

• Number of neutrons

• Number of electrons

• Number of protons plus neutrons

Which physical state of matter has no fixed shape or volume?

• Solid

• Liquid

• Gas

• Plasma

What type of bond involves the sharing of electrons?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

Which of these is an organic substance?

• Water

• Glucose

• Sodium chloride

• Carbon dioxide