Question

question 9
in cellular respiration, a two carbon molecule combines with a four - carbon molecule to form citric acid as part of
a. light reaction
b. glycolysis
c. etc
d. the calvin cycle
e. the krebs cycle

Explanation:

• Light reaction: Occurs in photosynthesis (not cellular respiration), involves converting light energy.
• Glycolysis: Breaks glucose (6 - carbon) into two 3 - carbon pyruvate molecules.
• ETC (Electron Transport Chain): Involved in ATP production from electron transfer, not the step described.
• Calvin Cycle: Part of photosynthesis (fixes \(CO_2\)).
• Kreb's Cycle (Citric Acid Cycle): Acetyl - CoA (2 - carbon) combines with oxaloacetate (4 - carbon) to form citric acid (6 - carbon).

Answer:

E. the Kreb's Cycle