Download Biochemistry Test w/Answers

Unit 3 – Biochemistry Test
1. A student designs an experiment that determines the effectiveness of a particular enzyme. In
the design, four types of food products are used.
The experimenter uses 5ml, 10ml, 15ml, and 20ml of enzyme with each of the four food types.
In addition, the experimenter places the 5ml and 10ml containers in the freezer.
Which of the following statements BEST describes this experimental design? (9C)
A. His experimental design will be easily supported by other scientists.
B. This experimental design is flawed due to the lack of a control variable and the
presence of multiple experimental variables.
C. This experiment’s design will produce multiple trials of data.
D. This experimental design will show that an enzyme can work in any temperature
and any volume or concentration.
2. The enzymes that catalyze cellular reactions are macromolecules made of organic compounds
composed of carbon, hydrogen, oxygen, and nitrogen. These types of macromolecules are
known as: (9A, 9C)
A. Starches
B. Sugars
C. Proteins
D. Fats
3. Like complex carbohydrates, proteins are biomolecules that serve many functions and can be
chemically broken down and restructured. Both proteins and complex carbohydrates are which
of the following? (9D)
A. Polymers of smaller subunits
B. Sequences of sugars
C. Lipids of large molecules
D. Nucleotides of DNA
4. One function of the carbohydrate macromolecule is to store energy. Which other
macromolecule also functions in storing energy? (9A)
A. DNA
B. Protein
C. RNA
D. Lipid
5. Many land plants store energy in starch. When energy is needed, the starch molecules can be
broken down quickly. This chemical reaction produces which of the following? (9A, 9D)
A. Amino acids
B. Lipids
C. Monosaccharides
D. RNA chains
6. Which of the following macromolecules in a prominent part of the animal tissue that functions
in insulation, helping animals conserve heat? (9A)
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic Acids
7. Which is the MOST valid conclusion based on this graph? (9C)
A.
B.
C.
D.
Enzymes are not affected by temperature
Enzymes work most effectively at low temperatures
Raising the temperature always makes an enzyme work better
Enzyme function decreases after a certain favorable temperature
8. What simple molecule reacts with itself to form this disaccharide? (9A, 9D)
A.
B.
C.
D.
DNA
Amino acids
Glucose
Lipids
9. Which of the following is a function of a carbohydrate? (9A)
A. Forms the cell wall
B. Insulation
C. Gene expression
D. Regulates enzymes
10. Which of the following is a function of a protein? (9A)
A. Forms the cell wall
B. Insulation
C. Gene expression
D. Regulates enzymes
11. Enzymes are proteins that help increase the rate of chemical reactions inside cells. These
proteins are composed of many simpler molecules called amino acids. Which of the following
suggests that the shape of an enzyme determines the enzyme’s function? (9C)
A. Enzymes are specific to a substrate
B. Enzymes can operate in a wide range of conditions
C. Enzymes are activated by neighboring molecules
D. Enzymes can be found in all life forms
12. In the enzyme-substrate complex, what is represented by Y? (9C)
A.
B.
C.
D.
Enzyme
Substrate
Active site
Product
13. Using the picture from the previous question, what does step III illustrate? (9C)
A. Enzyme specificity
B. Changes in enzyme after reaction
C. Conversion of substrate into products
D. Release of activation energy
14. Large biological molecules are made up of smaller subunits. What are these smaller subunits
called? (9D)
A. Enzymes
B. Polymers
C. Monomers
D. Cells
15. Which statement best describes the function of nucleic acids? (9A)
A. Stores genetic information and helps to make proteins
B. Increases the rate of chemical reactions
C. Stimulates metabolism in all body cells
D. Activates secretion of the body’s hormones
16. A macromolecule is composed of glycerol and fatty acids and functions as a hormone. This
molecule is a: (9A)
A. Phosphate
B. Lipid
C. Polysaccharide
D. Carbohydrate
17. The subunits of protein are: (9A, 9D)
A. Polysaccharides
B. Carbohydrates
C. Amino acids
D. Lipids
18. Pepsin and trypsin are two of the digestive enzymes that break down protein. A group of
students studied the pH requirements of the enzymes. The graph below shows the results.
The student found that pepsin functions
best in an acidic environment and
trypsin functions best in a neutral
environment. Based on their
observations, pepsin most likely aids in
digestion in which part of the human
body? (9C)
A.
B.
C.
D.
Pancreas
Intestines
Mouth
Stomach
19. Which of the following biomolecules typically contains both nitrogen and phosphate? (9A)
A. Lipid
B. Protein
C. Nucleic Acid
D. Carbohydrate
20. Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis
lipids provide cells with more: (9A)
A. Nitrogen
B. Proteins
C. Structure
D. Energy