Question

Amoebas are single-celled eukaryotes found in ponds. Amoebas take in oxygen and release carbon dioxide by diffusion across the cell membrane. These gases are transported throughout the cell by the cytoplasm.

Based on the information above, which of the following best compares structures involved in gas exchange in frogs to structures involved in gas exchange in amoebas?
A.
The blood acts like the cell membrane, and the kidneys act like the cytoplasm.
B.
The lungs act like the cell membrane, and the blood acts like the cytoplasm.
C.
The mouth acts like the cell membrane, and the kidneys act like the cytoplasm.
D.
The lungs act like the cell membrane, and the mouth acts like the cytoplasm.

Answer 1

B.

The lungs are the respiratory surface where O2 and CO2 diffuse between frog and environment (like the amoeba's cell membrane), and the blood carries those gases throughout the frog's body (like the cytoplasm distributes gases within the amoeba).