What is a characteristic of the all-or-none response?
a. If a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously.
b. A neuron will only produce an action potential if it has been depolarized to its threshold level.
c. All neurons of a nerve bundle discharge impulses at the same frequency.
d. A neuron can create an action potential of varying intensities.
e. Either all or none of the neurons of a brain region will fire impulses when stimulated.
b
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Like other members of their phylum, jellyfishes have specialized stinging cells called ____ as part of
their epidermis, which they use to paralyze small prey.
a. choanocytes b. polyps c. cnidocytes d. flame cells e. tentacles
Anaerobic respiration is most common in
A. animals. B. protozoans. C. fungi. D. plants. E. archaeans.
Acellular vaccines and subunit vaccines
A. are always genetically engineered. B. confer passive immunity. C. contain select antigenic components of a pathogen rather than whole cells or viruses. D. contain modified bacterial exotoxin molecules. E. utilize DNA strands that will produce the antigen.
Which of the following would not be a study of an organism in its natural environment?
a. a copperhead snake in an eastern deciduous forest b. a fruit fly at a picnic c. a child in a park d. a clown fish in an aquarium e. a lion on the African savanna.