Answer the following statements true (T) or false (F)
1. Sodium and potassium ions can easily diffuse through the lipid bilayer of plasma membranes.
2. Transport of salts against their concentration gradients is energetically expensive.
3. If you measured the urine concentration of a freshwater fish, you would find that it was more concentrated than its blood.
4. If you measured the urine concentration of a saltwater fish, you would find that it was more concentrated than its blood.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
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