WorksheetsUnit 1: Biochemistry
Total questions: 21
Worksheet time: 15mins
The main purpose/function of nucleic acids is _____.
storing energy
carrying genetic information
membrane structure
all of the above
What type of molecules repel water?
hydrophobic
hydrophilic
phospholipids
polar molecules
Which gives you quick energy?
lipids
carbohydrates
proteins
amino acids
Enzymes cause what type of reactions?
speed up reactions by lowering activation energy
slows down reactions by lowering activation energy
speeds up reactions by raising activation energy
slows down reactions by raising activation energy
Enzymes affect the reactions in living cells by changing the
products of the reaction
pH of the reaction
temperature of the reaction
speed of the reaction
Water makes up approximately 70% of the human body and plays a vital role in regulating body temperature. Which property of water
makes it good at regulating temperature?
Water exhibits strong adhesion.
Water has a high capacity for heat.
Water has an unusual crystalline structure.
Water is a good solvent.
Juan, after finding no cold sodas in the refrigerator, placed a can of soda in the freezer. He then proceeded to check his Snap Chat and
Instagram accounts and forgot about the soda. Later that evening his brother opened the freezer, and it was brown. Juan’s soda can
had split open!
What is the BEST explanation for what happened?
When the water froze in the soda, the space between water molecules expanded.
When the water froze in the soda, it weakened the molecular bonds in the aluminum can.
As the water cooled in the soda. It adhered to the can causing it to split.
As the water cooled in the soda, the surface tension of the water decreased and the can collapsed.
Pepsin and trypsin are two of the digestive enzymes that break down protein. A group of students studied the pH requirements of these
enzymes. The graph below shows the results.
Pepsin because it functions best in strongly basic pH.
Trypsin because it functions best when the pH is high.
Pepsin because it functions best in strongly acidic pH.
Trypsin because it functions best when the pH is low.
Meat tenderizer contains an enzyme that interacts with meat, but it works best at room temperature.
If meat is coated with tenderizer and then placed in a refrigerator for a short time, how would the enzyme be affected by the temperature
change?
Its shape would change.
The enzyme would speed up.
The enzyme would be used up.
Its activity would slow down.
There are many different enzymes located inside a single cell. Which of the following statements BEST describes how enzymes are
able to catalyze specific reactions?
After each enzyme works, it is used up and different enzymes catalyze the other reactions.
Most enzymes can catalyze many different reactions.
An enzyme binds to a specific substrate (reactant) for the reaction catalyzed.
Enzymes change their pH to fit the substrates (reactants) for different reactions.
Compare the two graphs below. At which temperature and pH will the enzyme be most active?
Temperature and pH have no effect on the action of this enzyme.
This enzyme works best at a temperature of 50°C and a pH of 12.
This enzyme works best at a temperature above 50°C and a pH above 12.
This enzyme works best at a temperature of 35°C and a pH of 8.
Some proteins catalyze biochemical reactions. If a genetic defect prevented a protein catalyst from being produced, which of the
following do you predict would happen in the cell?
The reverse reaction of the one that the protein catalyzes would begin to proceed.
The cell would find a different type of protein to catalyze the reaction.
The reaction the protein catalyzes would proceed very slowly or not at all.
The reaction the protein catalyzes would only occur in some places in the cell.
Jonathan and David are preparing for a sprinting race called the 100 meter dash. They are eating a meal before their race begins.
Which macromolecule is best to eat and why?
To speed up a reaction, nucleic acids would be the best source.
Carbohydrates as they are a quick source of energy for the body.
Lipids as they are available in both a liquid and solid state.
For long-term energy storage, proteins are a great choice.
The diagram below shows two amino acids joining together.
Carbohydrates
Lipids
Nucleic Acids
Proteins
Which of the following molecules is made by joining together many nucleotides?
The carbohydrate starch
The protein collagen
Deoxyribonucleic acid (DNA)
Cortisol (a lipid hormone)
A scientist analyzing an unknown substance has determined that it consists of carbon, hydrogen and oxygen. During experimentation,
she determines that the substance is soluble in oil but NOT in water. Which of the following macromolecules is the unknown substance
most likely to be?
Carbohydrate
Protein
Lipid
Nucleic Acid
Tristan is doing an experiment to see how many drops of water will fit on top of a penny. Although the area of the penny is only 9 times larger than the area of a water drop, Tristan fits 41 water drops on the surface of the penny.
What allows so many drops of water to form an unbroken bubble on top of the penny?
The water molecules absorb heat from the penny and condense down closer to the penny's surface.
The water molecules dissolve the penny and mix into its three-dimensional (3D) shape.
The water molecules are attracted to each other by hydrogen bonds, so the water's surface does not break.
The water molecules evaporate into the air immediately after being placed on the penny.
Tristan is doing an experiment to see how many drops of water will fit on top of a penny. Although the area of the penny is only 9 times
larger than the area of a water drop, Tristan fits 41 water drops on the surface of the penny.
Tristan expands the experiment to test how many drops of different liquids will fit on the penny. Tristan tests water five times and tests
rubbing alcohol five times. The average number of drops of water that fit on the penny was much higher than the average for rubbing
alcohol.
What is the independent variable in Tristan's experiment?
Five
The penny
The different types of liquid
The number of drops that fit on the penny
