Methanogens often grow in association with
A. nitrifying bacteria.
B. lithotrophic bacteria.
C. photosynthetic bacteria.
D. fermentative bacteria.
D
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Which is an example of a monocot?
a. cactus b. onions c. oak tree d. pine tree e. tomato plant
You are a veterinarian working for the San Diego Zoo. Today, you are performing an autopsy on a 22.7-gram frog and a 21.2-gram lizard, both of which appear to have died of a respiratory infection
Why are you not surprised to find that the lungs of the lizard have a larger internal surface area than those of the frog? A) The lizard is larger than the frog. B) Lizards have a higher metabolic rate than frogs. C) Lizards lay shelled eggs on land, whereas frogs lay jelly-like eggs in water. D) Lizards have dry, scaly skin, whereas frogs have thin, moist skin. E) Lizards are more susceptible than frogs to atmospheric pollutants.
Exotoxins are
A) secreted and only made by Gram-positive bacteria. B) secreted and the targets of some childhood vaccines. C) secreted. D) only made by Gram-positive bacteria. E) the targets of some childhood vaccines.
An atom is made of protons and neutrons (in the nucleus) and electrons spinning around in orbital shells. The number of electrons always equals _____
the number of neutrons the number of protons and neutrons the number of protons none of the above