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WorksheetsSOL Review: Unit 2 (Biochemistry)
Total questions: 20
Worksheet time: 20mins
Proteins are formed from monomers (subunits) called
amino acids
fatty acids
nucleic acids
nucleotides
The unique properties of water enable life to exist on Earth. Which of these is a property of pure water?
It dissolves many substances.
Its solid form is more dense than its liquid.
It has a low heat absorption capacity.
It is slightly more acidic than air.
Enzymes only work with specific substrates because each substrate
has a specific activation site for enzyme attachment
can only use a specific ionic bond with the enzyme
destroys its specific enzyme
actively interferes with other substrates around it
Which of the following molecules is most abundant in the cells of the human body?
water
lipids
nucleotides
amino acids
Unlike other animals, mammals can perspire. The main benefit of perspiring is that it
cools the skin with evaporation
removes excess water from the cells
removes dirt from the surface of the skin
relaxes the muscles
Peroxidase is an enzyme that breaks down hydrogen peroxide in cells. It accomplishes this because of its structure. What part of the enzyme is involved in catalytic activity?
active site
binding pocket
quaternary structure
pleated sheet
Which property of water allows many land-dwelling organisms to maintain body temperature by eliminating excess heat?
water's ability to evaporate
water's movement by capillary action
water's capacity to dissolve substances
water's formation of ions in solution
Some insects can stand on the surface of water because water
is cohesive and adhesive
is a good evaporative coolant
has a high boiling point
has a high specific heat
Pepsin is found in the human stomach and breaks down proteins to smaller peptides. What is pepsin?
an enzyme
a mineral
a carbohydrate
a vitamin
Which of the following macromolecules are a prominent part of animal tissues that function in insulation, helping animals conserve heat?
lipids
carbohydrates
proteins
nucleic acids
What is the function of enzymes in biological systems?
Enzymes act as catalysts to drive chemical reactions forward.
Enzymes act as substrates when the necessary proteins are unavailable.
Enzymes act as products to create new chemical reactions.
Enzymes bond with substrates to create the new reaction products.
Both lipids and carbohydrates are important in animal cells because both
store energy
contain nitrogen
form cell walls
provide insulation
Biochemical substances in the human body are maintained at about a neutral pH except for the
stomach fluids
blood
lymph
internal material of living cells
Chart A shows how changes in pH cause testing paper to change color. Chart B shows how testing papers reacted with several experimental substances. Which of these has a pH of about 3?
apples
beans
milk
shrimp
Ice floats on a lake. This characteristic of water is responsible for
preventing a lake from freezing solid
suffocation of aquatic organisms
mixing a lake's thermal layers
altering migration patterns of fish
Most cellular activities are processes regulated by the action of
enzymes
carbohydrates
lipids
polysaccharides
This graph shows that
pH effects the activity rate of enzymes
pepsin is less sensitive to pH than trypsin
pepsin is less effective at low pH than trypsin
more enzymes are present at a higher pH
Which term represents all of the chemical activities that happen inside of living cells?
metabolism
synthesis
anabolic reactions
catabolic reactions
Under conditions of high heat or change in pH, enzymes lose their ability to function because they lose their
shape
charge
cell wall
water
Proteins are among the most diverse group of macromolecules because of the
different amino acids that can be connected in many sequences
different types of bonds finking amino acids together
energy phosphate groups that the amino acids contain
link between each DNA base and an amino acid in a protein
