Unit 3 Review questions

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

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

What are enzymes used for? 

• speed up chemical reactions 
• store energy 
• fight off infections 
• structural support for cell walls of plants 

Which is an example of a nucleic acid?

• sucrose & lactose 
• hormones & antibodies 
• DNA & RNA
• steroids 

The building blocks of carbohydrates are

• Simple sugars (glucose)
• Nucleotides
• Fatty Acids
• Amino Acids

A large carbohydrate (polysaccharide) is

• Glucose
• Lactose
• Lactase
• Starch

An organic compound ALWAYs contains

• Carbon and Oxygen
• Oxygen and Hydrogen
• Carbon and Hydrogen
• Carbon and Iron