Changes in temperature and pH can decrease an enzyme’s activity by breaking
peptide bonds
hydrogen bonds
amino acids
sulfur bonds
2. Multiple Choice
1 minute
1 pt
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
3. Multiple Choice
1 minute
1 pt
The specific reactants that an enzyme acts on are called
catalysts
substrates
proteins
amino acids
4. Multiple Choice
1 minute
1 pt
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
5. Multiple Choice
1 minute
1 pt
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.
6. Multiple Choice
1 minute
1 pt
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.
7. Multiple Choice
1 minute
1 pt
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
8. Multiple Choice
1 minute
1 pt
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
9. Multiple Choice
1 minute
1 pt
DNA and RNA are two types of
proteins
lipids
carbohydrates
nucleic acids
10. Multiple Choice
1 minute
1 pt
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
11. Multiple Choice
1 minute
1 pt
Fats, oils, and cholesterol are all types of
fatty acids
lipids
hormones
cell membranes
12. Multiple Choice
1 minute
1 pt
Which category of carbon-based molecules includes sugars and starches?
proteins
carbohydrates
unsaturated fatty acids
phospholipids
13. Multiple Choice
1 minute
1 pt
Carbon is unique due to the carbon atom’s
hydrogen bonding strength
ionic compounds
six outer unpaired electrons
bonding properties
14. Multiple Choice
1 minute
1 pt
In the lock-and-key model of enzyme function shown in the figure, what is happening in step 2?
The active sites are restructuring the enzyme
The substrates are beginning to bind to the enzyme
The catalyzed reaction is releasing a product.
The enzyme is causing new bonds to form between the substrates.
15. Multiple Choice
1 minute
1 pt
Which aspect of a chemical reaction is affected by enzymes?
rate
direction
pH
equilibrium
16. Multiple Choice
1 minute
1 pt
The activation energy needed for a chemical reaction is decreased by a
reactant
product
catalyst
substrate
17. Multiple Choice
1 minute
1 pt
Chemical reactions that absorb more energy than they release are called
exothermic
catalyzed
endothermic
activated
18. Multiple Choice
1 minute
1 pt
Identify the products in this reaction: 6H2O + 6CO2 → C6H12O6+ 6O2.
6H2O and 6CO2
6CO2 and C6H12O6
6H2O, C6H12O6, and 6O2
C6H12O6 and 6O2
19. Multiple Choice
1 minute
1 pt
Substances are changed into different substances when bonds break and form during
ion formation
chemical equilibrium.
chemical reactions
hydrogen bonding
20. Multiple Choice
1 minute
1 pt
Both animal fats and plant oils are made up of glycerol and