Final answer:
The substances that can typically cross a semipermeable membrane are oxygen (O2), Carbon Dioxide (CO2), and steroid hormones. These molecules can move across the cell membrane through passive transport down their concentration gradient.
Step-by-step explanation:
The question is asking which substances can typically cross a semipermeable membrane such as the plasma membrane of a cell. A semipermeable membrane allows certain small molecules to pass through while blocking others. Oxygen (O2), Carbon Dioxide (CO2), and steroid hormones are all molecules that can diffuse through the plasma membrane by passive transport. The passive transport process allows these molecules to move across the membrane down their concentration gradient without the need for energy.
O2 and CO2 are small, uncharged molecules that readily diffuse across the lipid bilayer of the cell membrane. Steroid hormones, being lipophilic or hydrophobic, can also pass through the cell membrane because they can dissolve in the lipid bilayer.
Therefore, the answer to the question is option 5) A, B, and C, meaning oxygen, carbon dioxide, and steroid hormones can all typically cross a semipermeable membrane.