Ch 2 - The Chemistry of Life

All matter is composed of:

• atoms
• cells
• carbon
• hydrogen

The periodic table displays ____, arranged by their atomic number.

• molecules
• protons
• elements
• neutrons

H2O is an example of a(n):

• element
• subatomic particle
• atom
• compound

Which particles are found within the nucleus of an atom?

• protons and electrons
• protons and neutrons
• electrons and neutrons
• protons, electrons, and neutrons

What is responsible for the “stickiness” of water that results in cohesion and adhesion?

• covalent bonds
• ionic bonds
• hydrogen bonds
• van der Waals forces

Which property of water explains why ice floats?

• hydrogen bonds
• van der Waals forces
• adhesion
• solvent property

A water strider can move across the surface of water due to what property of water?

• adhesion
• cohesion
• polarity
• heat capacity

Most enzymes found in the body work best at about 40 degrees. This represents the enzyme’s:

• base rate
• substrate
• optimal pH
• optimal temperature

Substances that speed up chemical reactions in the body are called:

• substrates
• enzymes
• carbohydrates
• ions

Which macromolecule is made from repeating units of sugar, like glucose?

• lipids
• carbohydrates
• proteins
• nucleic acids