chemistry of life

Inhibitors of enzymes cause enzymes to become inactive because they block the

• substrate

• enzyme

• active site

• chemical site

Atoms in molecules share pairs of electrons when they make

• covalent bonds.

• ionic bonds.

• hydrogen bonds.

• polymers.

The smallest basic unit of matter is the

• molecule.

• atom.

• compound.

• cell.

Both animal fats and plant oils are made up of glycerol and

• phospholipids.

• fatty acids.

• polar molecules.

• saturated fats.

The four main types of carbon-based molecules in organisms are carbohydrates, lipids, nucleic acids, and

• starches.

• fatty acids.

• monosaccharides.

• proteins.

Which of the following is NOT an organic compound?

• C₆H₁₂O₆

• H₂O

• CH₄

• C₂H₄O₂

These three elements make up carbohydrates

• carbon, helium, oxygen

• nitrogen, oxygen, water

• carbon, hydrogen, oxygen

• nitrogen, carbon, water

Tomato juice has a pH of 4. Determine if it's an acid, base, or neutral. 

• acid

• base

• neutral 

What does  the lock-and-key model state?

• any substrate can bind an enzyme 

• only specific amino acids can build carbohydrates 

• specific substrates bind specific enzymes 

•  nucleotides must fit like a lock and a key 

Which aspect of a chemical reaction is affected by enzymes?

• direction

• rate

• equilibrium

• pH