Question

fill in the blank question
a
moves needed substances or waste materials through the plasma membrane and contributes to the selective permeability of the plasma membrane.
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Explanation:

The question is about the process or structure that moves substances across the plasma membrane. In cell biology (a subfield of Biology, which is part of Natural Science), the term "transport protein" or "membrane transport" - but more specifically, a "transport protein" (or "carrier protein" or "channel protein") is involved, but the common phrase here is "transport protein" or the process is "passive transport" or "active transport", but the blank structure - the correct term for a structure that moves substances through the plasma membrane is a "transport protein" (or "carrier protein", but the standard fill here is "transport protein" or more precisely, the answer is "transport protein" (or "carrier protein", but the most appropriate is "transport protein" or "membrane transport" - wait, the sentence structure: "A [blank] moves needed substances...". So the correct term is "transport protein" (or "carrier protein", but the standard answer for this cell biology concept is "transport protein" (or "carrier" or "channel", but the general term is "transport protein"). Wait, actually, the correct answer is "transport protein" (or more precisely, "carrier protein" or "channel protein", but the broader term is "transport protein"). Alternatively, the process is "active transport" or "passive transport", but the structure is a protein. Wait, the sentence: "A [blank] moves needed substances or waste materials through the plasma membrane...". So the correct term is "transport protein" (or "carrier protein", "channel protein"). But the most common fill here is "transport protein" (or "carrier protein"). Alternatively, the answer is "transport protein".

Answer:

transport protein