Biochemistry

For the quickest source of energy if going for a run, you should eat a food that contains a high percentage of 

• sodium
• protein
• fats
• carbohydrates

The specific reactants that an enzyme acts on are called

• catalysts
• substrates
• proteins
• amino acids

Acetylcholine is an important chemical signal in the nervous system. It is  broken down into other chemicals by cholinesterase.Cholinesterase is which of the following?

• enzyme
• hormone
• lipid
• organelle

What happens to the speed of a chemical reaction when a catalyst is present?

• It becomes erratic.
• It stays the same.
• It speeds up.
• It slows down.

Which statement best describes the graph shown?

• Reaction B occurs at a slower rate.
• The original reaction is catalyzed.
• Less energy is needed to start reaction B.
• More energy is released by the original reaction.

What is the term for the amount of energy that needs to be added for a chemical reaction to start?

• bond energy
• chemical energy
• activation energy
• reactant energy

DNA and RNA are two types of

• proteins
• lipids
• carbohydrates
• nucleic acids

An altered form of the protein collagen causes a condition where bones break easily. Which of the following are components of collagen?

• fatty acids
• amino acids
• nucleic acids
• monosaccharides

Fats, oils, and cholesterol are all types of

• fatty acids
• lipids
• hormones
• cell membranes

Which category of carbon-based molecules includes sugars and starches?

• proteins
• carbohydrates
• unsaturated fatty acids
• phospholipids