Question

An enzyme is a protein that A)transports nutrients across a membrane B) increases the rate of a chemical reaction C)receives and sends signals across a cell D)provides structure for the cell's organelles

Answer 1

An enzyme is a catalyst for chemical reactions. Catalyst means that it "speeds up" something. This means that the answer is:

B) Increases the rate of a chemical reaction

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Answer 2

An enzyme is a biological catalyst, making B the right answer.

I hope I helped!