Question

question 47 high concentrations of o2 and low concentrations of co2 in a leaf lead to ____, which undermines the calvin cycle. options: carbon fixation, cellular respiration, photorespiration, chemiosmosis. protons are able to move freely through the thylakoid membrane. true false

Explanation:

High O₂ and low CO₂ concentrations in a leaf lead to photorespiration. Photorespiration occurs when rubisco (the key enzyme in the Calvin - Cycle) binds to O₂ instead of CO₂ under such conditions, which undermines the efficiency of the Calvin Cycle. Protons cannot move freely through the thylakoid membrane; they require specific protein channels (ATP - synthase channels) to move down their electrochemical gradient.

Answer:

Question 47: B. photorespiration
Protons are able to move freely through the thylakoid membrane: False