Question

multiple choice question
most primary active transport systems are ______.

○ symporters
○ antiporters
○ uniporters

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Explanation:

Primary active transport systems use energy (e.g., ATP) to move molecules. Uniporters transport a single type of molecule across the membrane, and most primary active transporters are uniporters. Symporters (cotransport, secondary active) and antiporters (exchange, some secondary active) are more associated with secondary active transport or specific exchange, while uniporters are common in primary active transport (e.g., ATP - driven pumps moving one ion/molecule).

Answer:

C. uniporters (assuming the options are labeled A: symporters, B: antiporters, C: uniporters; if original labels differ, adjust to match, but based on content, the correct option is the one with "uniporters")