MDCAT Biology MCQ #454

Under conditions of high temperature and low CO2, the enzyme Rubisco changes its behavior. This shift is characterized by:

MDCAT Biology MCQ #454

  1. Question 1

    Q1. Under conditions of high temperature and low CO2, the enzyme Rubisco changes its behavior. This shift is characterized by:

    • A) Rubisco only reacts with CO2 to produce glucose
    • B) Rubisco functions as a kinase during the light reaction
    • C) Rubisco is found in the cytoplasm of all plant cells
    • D) Rubisco can use oxygen as a substrate instead of CO2

    Answer: Rubisco can use oxygen as a substrate instead of CO2

    Explanation: Rubisco acts as a carboxylase when CO2 is high, but as an oxygenase when O2 is high, leading to photorespiration.