You have discovered an organism that lives inside the gastrointestinal tract and does not contain a nucleus. Based on what you know of cellular respiration, how does it obtain its energy?
A) photosynthesis
B) glycolysis
C) glycolysis and the citric acid cycle
D) photosynthesis and the citric acid cycle
E) glycolysis, the citric acid cycle, and the electron transport chain

Question

Quizplus · Accepted Answer

Since the organism does not contain a nucleus, it is a prokaryote. Prokaryotes obtain their energy through the process of glycolysis, which takes place in the cytoplasm. Therefore, the best choice is B, glycolysis. Photosynthesis is used by organisms that contain chloroplasts, such as plants, but not by organisms living in the gastrointestinal tract. The citric acid cycle and the electron transport chain are metabolic pathways that take place in the mitochondria, but prokaryotes do not have mitochondria.

You Have Discovered an Organism That Lives Inside the Gastrointestinal