From the following list of properties, indicate which one(s) can be used to distinguish between each of the following pairs of transport mechanisms.
Transport Mechanisms:
A. Simple diffusion; facilitated diffusion
B. Facilitated diffusion; active transport
C. Simple diffusion; active transport
D. Symport; antiport
E. Uniport; coupled transport
Properties:
1. Directions in which two transported solutes move
2. Direction the solute moves relative to its concentration gradient or its electrochemical potential
3. Kinetics of solute transport (rate and ability to move)
4. Requirement for energy
5. Requirement for simultaneous transport of two solutes
6. Intrinsic directionality
7. Competitive inhibition
Answer
Transport Mechanisms:
A. Simple diffusion; facilitated diffusion: Kinetics of solute transport (rate and ability to move) and Competitive inhibition. Thus, the correct options are (3) and (7).
B. Facilitated diffusion; active transport: Direction the solute moves relative to its concentration gradient or its electrochemical potential, Requirement for energy, and Intrinsic directionality. Thus, the correct options are (2), (4), and (6).
C. Simple diffusion; active transport: Direction the solute moves relative to its concentration gradient or its electrochemical potential, Kinetics of solute transport (rate and ability to move), Requirement for energy, Intrinsic directionality, and Competitive inhibition. Thus, the correct options are (2), (3), (4), (6), and (7).
D. Symport; antiport: Directions in which two transported solutes move. Thus, the correct answer is option (1).
E. Uniport; coupled transport: Requirement for simultaneous transport of two solutes. Thus, the correct answer is option (5).
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