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WorksheetsBiochemistry
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
Changes in temperature and pH can decrease an enzyme’s activity by breaking
a)
peptide bonds
b)
hydrogen bonds
c)
amino acids
d)
sulfur bonds
2.
For the quickest source of energy if going for a run, you should eat a food that contains a high percentage of
a)
sodium
b)
protein
c)
fats
d)
carbohydrates
3.
The specific reactants that an enzyme acts on are called
a)
catalysts
b)
substrates
c)
proteins
d)
amino acids
4.
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?
a)
enzyme
b)
hormone
c)
lipid
d)
organelle
5.
What happens to the speed of a chemical reaction when a catalyst is present?
a)
It becomes erratic.
b)
It stays the same.
c)
It speeds up.
d)
It slows down.
6.
Which statement best describes the graph shown?
a)
Reaction B occurs at a slower rate.
b)
The original reaction is catalyzed.
c)
Less energy is needed to start reaction B.
d)
More energy is released by the original reaction.
7.
Which phrase best describes an exothermic chemical reaction?
a)
releases more energy than it absorbs
b)
forms products with higher bond energy than reactants
c)
does not absorb any energy
d)
is in a state of equilibrium
8.
What is the term for the amount of energy that needs to be added for a chemical reaction to start?
a)
bond energy
b)
chemical energy
c)
activation energy
d)
reactant energy
9.
DNA and RNA are two types of
a)
proteins
b)
lipids
c)
carbohydrates
d)
nucleic acids
10.
An altered form of the protein collagen causes a condition where bones break easily. Which of the following are components of collagen?
a)
fatty acids
b)
amino acids
c)
nucleic acids
d)
monosaccharides
11.
Fats, oils, and cholesterol are all types of
a)
fatty acids
b)
lipids
c)
hormones
d)
cell membranes
12.
Which category of carbon-based molecules includes sugars and starches?
a)
proteins
b)
carbohydrates
c)
unsaturated fatty acids
d)
phospholipids
13.
Carbon is unique due to the carbon atom’s
a)
hydrogen bonding strength
b)
ionic compounds
c)
six outer unpaired electrons
d)
bonding properties
14.
In the lock-and-key model of enzyme function shown in the figure, what is happening in step 2?
a)
The active sites are restructuring the enzyme
b)
The substrates are beginning to bind to the enzyme
c)
The catalyzed reaction is releasing a product.
d)
The enzyme is causing new bonds to form between the substrates.
15.
Which aspect of a chemical reaction is affected by enzymes?
a)
rate
b)
direction
c)
pH
d)
equilibrium
16.
The activation energy needed for a chemical reaction is decreased by a
a)
reactant
b)
product
c)
catalyst
d)
substrate
17.
Chemical reactions that absorb more energy than they release are called
a)
exothermic
b)
catalyzed
c)
endothermic
d)
activated
18.
Identify the products in this reaction: 6H2O + 6CO2 → C6H12O6+ 6O2.
a)
6H2O and 6CO2
b)
6CO2 and C6H12O6
c)
6H2O, C6H12O6, and 6O2
d)
C6H12O6 and 6O2
19.
Substances are changed into different substances when bonds break and form during
a)
ion formation
b)
chemical equilibrium.
c)
chemical reactions
d)
hydrogen bonding
20.
Both animal fats and plant oils are made up of glycerol and
a)
polar molecules
b)
phospholipids
c)
saturated fats
d)
fatty acids
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