Biology Chapter 10 Latest Exam 2025-
2026 Questions with Complete
Solutions.
B and D - Answer Morgan has diabetes and must carefully monitor his food intake. He is
learning the calorie count of the different macromolecules—carbohydrates, proteins, and fats—
so that he can make choices to keep his blood sugar in the proper range. He notices that the
word calorie is sometimes spelled with a capital C. Which statements accurately describe
calories and Calories? Select all of the answers that apply.
A. A kilocalorie is equal to 1000 Calories.
B. A Calorie is equal to 1000 calories.
C. A calorie is equal to 1000 Calories.
D. A Calorie is equal to a kilocalorie.
B - Answer Mariana eats an orange. Which statement describes the ultimate source of the
energy that her body receives when she digests the orange?
A. Organic matter, rich soil in which the orange tree grows, and adequate water all work
together to generate the energy that can be obtained from the orange.
B. The light energy that originates from the sun provides the energy to grow oranges, which
contain macromolecules.
C. The orange tree obtains energy from the nitrogen and other compounds in fertilizer.
D. The orange contains the energy-rich nutrients that it draws from the soil.
D - Answer The molecules in the food we eat contain chemical energy stored in chemical
bonds. Which statement BEST explains how this energy is released?
A. Cells burn food molecules, releasing energy as heat that powers movement while keeping the
body at the correct temperature.
B. Chemical energy is released as eaten food is digested, giving off heat as a by-product.
C. Cells extract and capture the energy in food molecules all at once, then store it for later use.
D. Chemical bonds in food molecules are broken, releasing energy and allowing cells to use the
energy to make ATP.
C - Answer Natasha is making a model of cellular respiration. Her model shows the pathway
followed when there is enough oxygen available. What does Natasha's model show?
, D. an anaerobic pathway consisting of glycolysis, the Krebs cycle, and the electron transport
chain
B and C - Answer The process of combustion, or burning, is similar to the chemical processes
that release energy in cells. Wood burns at a very high temperature, about 600°C. Which two
statements explain how the human body is able to obtain energy without becoming too hot?
A. A large percentage of the cell is protein, which prevents rapid combustion.
B. The breakdown of glucose occurs in many small steps.
C. Low-temperature breakdown of glucose is enabled by enzymes that catalyze specific
reactions.
D. Both fuel and ample oxygen are required for fire; oxygen concentration is too low in the body
to allow combustion.
A and D - Answer The overall reactions for photosynthesis and cellular respiration are
opposite of each other. Select two statements that describe the two processes.
A. Photosynthesis uses carbon dioxide from the atmosphere and produces oxygen.
B. Cellular respiration uses carbon dioxide from the atmosphere and produces oxygen.
C. Photosynthesis uses oxygen to release energy from food and produces carbon dioxide as a
by-product.
D. Cellular respiration uses oxygen to release energy from food and produces carbon dioxide as
a by-product.
B - Answer Glycolysis is the first stage of cellular respiration and is an anaerobic process.
During glycolysis, glucose is converted to two molecules of pyruvic acid. How is glycolysis kept
functioning during cellular respiration?
A. Two high-energy electrons are passed to the carrier NADH, which transports electrons back
to glycolysis.
B. Two molecules of ATP from the cell are invested at the beginning of the process of glycolysis.
C. Pyruvic acid from glycolysis reacts to form acetyl-CoA, which then combines with a four-
carbon compound in the Krebs cycle and re-enters glycolysis.
D. Hydrogen ions pass back across the mitochondrial membrane through chemiosmosis and re-
enter glycolysis.
C - Answer Savannah is asked to explain the locations of the stages of cellular respiration.
What location should she give for the site of the Krebs cycle reactions?
A. the cell membrane, which surrounds the cell
2026 Questions with Complete
Solutions.
B and D - Answer Morgan has diabetes and must carefully monitor his food intake. He is
learning the calorie count of the different macromolecules—carbohydrates, proteins, and fats—
so that he can make choices to keep his blood sugar in the proper range. He notices that the
word calorie is sometimes spelled with a capital C. Which statements accurately describe
calories and Calories? Select all of the answers that apply.
A. A kilocalorie is equal to 1000 Calories.
B. A Calorie is equal to 1000 calories.
C. A calorie is equal to 1000 Calories.
D. A Calorie is equal to a kilocalorie.
B - Answer Mariana eats an orange. Which statement describes the ultimate source of the
energy that her body receives when she digests the orange?
A. Organic matter, rich soil in which the orange tree grows, and adequate water all work
together to generate the energy that can be obtained from the orange.
B. The light energy that originates from the sun provides the energy to grow oranges, which
contain macromolecules.
C. The orange tree obtains energy from the nitrogen and other compounds in fertilizer.
D. The orange contains the energy-rich nutrients that it draws from the soil.
D - Answer The molecules in the food we eat contain chemical energy stored in chemical
bonds. Which statement BEST explains how this energy is released?
A. Cells burn food molecules, releasing energy as heat that powers movement while keeping the
body at the correct temperature.
B. Chemical energy is released as eaten food is digested, giving off heat as a by-product.
C. Cells extract and capture the energy in food molecules all at once, then store it for later use.
D. Chemical bonds in food molecules are broken, releasing energy and allowing cells to use the
energy to make ATP.
C - Answer Natasha is making a model of cellular respiration. Her model shows the pathway
followed when there is enough oxygen available. What does Natasha's model show?
, D. an anaerobic pathway consisting of glycolysis, the Krebs cycle, and the electron transport
chain
B and C - Answer The process of combustion, or burning, is similar to the chemical processes
that release energy in cells. Wood burns at a very high temperature, about 600°C. Which two
statements explain how the human body is able to obtain energy without becoming too hot?
A. A large percentage of the cell is protein, which prevents rapid combustion.
B. The breakdown of glucose occurs in many small steps.
C. Low-temperature breakdown of glucose is enabled by enzymes that catalyze specific
reactions.
D. Both fuel and ample oxygen are required for fire; oxygen concentration is too low in the body
to allow combustion.
A and D - Answer The overall reactions for photosynthesis and cellular respiration are
opposite of each other. Select two statements that describe the two processes.
A. Photosynthesis uses carbon dioxide from the atmosphere and produces oxygen.
B. Cellular respiration uses carbon dioxide from the atmosphere and produces oxygen.
C. Photosynthesis uses oxygen to release energy from food and produces carbon dioxide as a
by-product.
D. Cellular respiration uses oxygen to release energy from food and produces carbon dioxide as
a by-product.
B - Answer Glycolysis is the first stage of cellular respiration and is an anaerobic process.
During glycolysis, glucose is converted to two molecules of pyruvic acid. How is glycolysis kept
functioning during cellular respiration?
A. Two high-energy electrons are passed to the carrier NADH, which transports electrons back
to glycolysis.
B. Two molecules of ATP from the cell are invested at the beginning of the process of glycolysis.
C. Pyruvic acid from glycolysis reacts to form acetyl-CoA, which then combines with a four-
carbon compound in the Krebs cycle and re-enters glycolysis.
D. Hydrogen ions pass back across the mitochondrial membrane through chemiosmosis and re-
enter glycolysis.
C - Answer Savannah is asked to explain the locations of the stages of cellular respiration.
What location should she give for the site of the Krebs cycle reactions?
A. the cell membrane, which surrounds the cell
