1. Practice Questions: Day 4 Biomolecules, Enzymes, & Cell Energy1)
4B (R)
2) Cells can generate as many as 36 to 38 molecules of adenosine triphosphate (ATP) from the metabolism of one molecule of glucose. Which cellular process results in this amount of ATP production?
A. Anaerobic cellular respiration
B. Protein synthesis
C. Aerobic cellular respiration
D. Photosynthesis
4B (R)
3) The differences between two molecules include the type of sugar that forms a section of the molecules and the identity of one of the four nitrogenous bases that make up another section of the molecules. These two molecules are —
A. proteins
B. lipids
C. nucleic acids
D. complex carbohydrates
9A (R)
4) Proteins and polysaccharides are polymers. These polymers are formed by dehydration synthesis. Which statement correctly identifies a difference in the structure of proteins and polysaccharides?
A. Only polysaccharides are comprised of repeating units of cytosine, adenine, guanine, and thymine.
B. Only proteins are formed from amino acids joined by peptide bonds.
C. Only polysaccharides can be folded and twisted to very specific shapes.
D. Only proteins can be large molecules with thousands of subunits.
9A (R)
5) Diatoms are one of the most common types of phytoplankton in marine habitats. Like plants, diatoms contain chlorophyll and produce glucose from which of the following?
A. CO2 and H2O
B. CO2 and O2
C. O2 and ATP
D. ATP and H2O
9B (S)

2. 6) Most plant leaves take in more carbon dioxide as light increases
6) Most plant leaves take in more carbon dioxide as light increases. They give off carbon dioxide if light intensity is too low. The graph shows a plant’s carbon dioxide levels at different light intensities.
At point X, the rate of which process is equal to the rate of photosynthesis?
A. Cellular respiration
B. Transpiration
C. Growth
D. Reproduction
9B (S)
7) Fireflies emit light. The production of light by an organism is called bioluminescence. To generate visible light, cell in a firefly's tail produce thousands of luciferase enzymes. Luciferase binds to a chemical called luciferin. Once bound, the luciferase enzyme speeds up a chemical reaction that combines an oxygen molecule and luciferin to produce oxyluciferin. This reaction requires energy and releases light. Which of the following best describes how the luciferase enzyme speeds up the chemical reaction?
A Luciferase increases the amount of time light is visible.
B Luciferase decreases the temperature of the environment inside the body of the firefly.
C Luciferase increases the number of sites on luciferin that must bind to oxygen.
D Luciferase decreases the amount of energy required for the reaction to start.
9C (S)
8) Lactose is found in milk products. It is converted by the body into a usable form in a series of chemical reactions. The diagram shows the series of reactions that convert lactose into a usable form.
Enzyme Enzyme Enzyme Enzyme 4
Lactose galactose galactose glucose glucose-
1-phosphate phosphate phosphate
If enzyme 3 is denatured, the levels of which substance will increase?
A Luciferase increases the amount of time light is visible.
B Luciferase decreases the temperature of the environment inside the body of the firefly.
C Luciferase increases the number of sites on luciferin that must bind to oxygen.
D Luciferase decreases the amount of energy required for the reaction to start.
2G/
11A (S)