When collecting samples from a sulfur spring in Russia, you discover an organism with a single circular chromosome and lacking a nuclear membrane. What sort of organism are you certain that your organism CANNOT be?
a. Methanococcus, an archae
b. Pseudomonas aeruginosa, a bacteria
c. An amoeba
d. Desulfovibrio, a bacteria
e. The newly-discovered sample could not possibly be any of the above types of organisms.