What are possible mechanisms of action for phagocytes? Select all correct choices
A. They can engulf and digest pathogens with
lysosome-enclosed enzymes.
B. They can destroy pathogens via the
production of reactive nitrogen species.
C. They can specifically target and kill virusinfected
cells.
D. They can form membrane attack
complexes (MACs).
A,B
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When we are able to recognize clearly defined families, orders, phyla, etc., it is due primarily to the
macroevolutionary factor of
a. extinction b. adaptation c. mutation d. natural selection e. continental drift
According to the fossil record, the oldest vascular plants are placed in the phylum:a
Rhyniophyta. b. Bryophyta. c. Anthocerophyta. d. Pteridophyta. e. Lycopodiphyta.
Which of the following organisms is a keystone species in a tropical rain forest?
a. gray wolf b. fruit-eating bats c. poison arrow frogs d. fig trees e. fruit-eating monkeys
At equilibrium, the free energy of a reaction is which of the following?
A.) at its lowest point B.) energetically unfavorable C.) at its highest point D.) energetically favorable E.) equal to delta Gc