Koch used ________ to culture bacterial cells in his laboratory
a. agar
b. gelatin
c. potatoes
d. agar, gelatin, and potatoes
Answer: D
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Amphibian eggs have large amounts of yolk at the ____ pole, and most metabolism takes place at the ____ pole
a. animal; vegetal b. animal; animal c. vegetal; vegetal d. vegetal; animal e. totipotent; telolecithal
Animals that have no circulatory system, such as flatworms, rely on _______to deliver nutrients and gases to their tissues.
A. diffusion B. osmosis C. hemolymph D. the lymphatic system E. the coelom
Which of the follow is false concerning the tetanospasmin toxin?
A) taken up by peripheral motor neurons and transported to the spinal cord B) leads to flaccid paralysis C) blocks the release of inhibitory neurotransmitters, preventing muscle relaxation D) causes intense muscle spasms, drooling, sweating, and irritability E) causes irreversible damage to neurons
Fats and carbohydrates serve as the primary fuels to produce energy.
a. true b. false