Biochemistry

Changes in temperature and pH can decrease an enzyme’s activity by breaking

• peptide bonds

• hydrogen bonds

• amino acids

• sulfur bonds

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.MS-LS1-7

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.

Tags

NGSS.HS-PS1-5

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.

Tags

NGSS.HS-PS1-4

Which phrase best describes an exothermic chemical reaction?

• releases more energy than it absorbs
• forms products with higher bond energy than reactants
• does not absorb any energy
• is in a state of equilibrium

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.HS-LS1-6