Photosynthesis/Respiration

In the cells of the human body, oxygen molecules are used directly in a process that

• releases energy

• digests fats

• synthesizes carbohydrate molecules

• alters the genetic traits of the cell

The temporary storage of energy in ATP molecules is part of which process?

• cell division

• cellular respiration

• protein synthesis

• DNA replication

The diagram below represents a biochemical process.

Which molecule is represented by X?

• DNA

• Starch

• Protein

• ATP

Which part of a molecule provides energy for life processes?

• carbon atoms

• oxygen atoms

• chemical bonds

• inorganic nitrogen

The diagram illustrates a process by which energy is released in organisms.

The energy released in this process was originally present in

• sunlight and then transferred to sugar

• sunlight and then transferred to oxygen

• the oxygen and then transferred to sugar

• the sugar and then transferred to oxygen

Which molecule stores the energy produced by cells in the reaction above?

• glucose

• ATP

• oxygen

• enzymes

Which change in a sample of pond water could indicate that microscopic animals are active?

• increase in ozone level

• increase in glucose level

• decrease in oxygen level

• decrease in carbon dioxide level

The flow of energy through an ecosystem involves many energy transfers. The diagram below summarizes the transfer of energy that eventually powers muscle activity.

The process of cellular respiration is represented by

• A

• B

• C

• A,B,C

Base your answer on the diagrams below and on your knowledge of biology. The arrow below each lettered process indicates where the process takes place.

What is Process A called?

• photosynthesis

• fermentation

• dehydration synthesis

• aerobic respiration

What is the combined net gain of ATP molecules at the completion of reactions A and B?

• 36

• 2

• 34

• 4