Chapter 2

The positively charged particle in an atom is the

• neutron

• proton

• electron

A covalent bond is formed by the

• transfer of electrons

• sharing of electrons

• gaining of electrons

• losing of electrons

Which formula represents an amino acid?

• 
• 
• 
• 

An enzyme speeds up a reaction by

• lowing the activation energy

• raising the activation energy

• releasing energy

• absorbing energy

Proteins are polymers formed from

• lipids

• carbohydrates

• amino acids

• nucleic acids

An attraction between different substance

Lower a chemical reaction's activation energy