Biochemistry Basics

The positively charged particle in an atom is the

• neutron

• proton

• ion

• electron

Two or more different atoms are combined in definite proportions in any

• compound

• symbol

• element

• isotope

A covalent bond is formed by the

• sharing of electrons

• losing of electrons

• transfer of electrons

• gaining of electrons

When you shake sugar and sand together in a test tube, you cause them to form a

• compound

• solution

• suspension

• mixture

Electrons have what charge?

• Negative
• Positive
• Neutral
   (No Charge)

A(n) ____________________ is a pure substance made of a single type of atom and cannot be broken down.

• Element
• Compound
• Molecule
• Mixture

Which of the following is not an element found in large abundance in organisms?

• Calcium
• Carbon
• Hydrogen
• Nitrogen

Atoms that have gained or lost electrons are called:

• Ions
• Isotopes
• Isomers
• Neutrinos

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer
• Water

Which of the following is an example of COHESION?

• water sticking to water

• water sticking to glass

• oil sticking to plastic

• hydrogen sticking to oxygen