What does the progressive hypothesis of virus evolution state?
a. Viruses originated from self-replicated entities similar to transposons.
b. Viruses originated from free-living cells or intracellular parasites.
c. Viruses originated from RNA and DNA molecules that escaped from a host cell.
d. Viruses originated from alien DNA that was carried to Earth by a meteor.
c. Viruses originated from RNA and DNA molecules that escaped from a host cell.
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What vulnerability is introduced by cell-surface signaling receptors?
a. They can cause a hole to form in the plasma membrane. b. They can introduce cells into the wrong areas of the body during development. c. They provide highly specific binding sites for viruses and other pathogens. d. They can result in non-specific binding foreign cells.
The domain Eukarya includes all of the following EXCEPT:a
protozoa. b. mushrooms. c. bears. d. mosses. e. bacteria.
Which of the following best explains why machines can never be 100% efficient?
a. the tendency of energy not to spread out b. the tendency of energy to spread out c. the tendency of energy to be kept d. the tendency of energy to be lost
Which could be a topic for a community-level study of a hydrothermal vent ecosystem?
A) the genetic relationships between crabs at the vent and other areas of the ocean B) the evolution of a certain species of bacteria in response to the changing composition of the water emitted by the hydrothermal vents C) the composition of the water emitted by hydrothermal vents D) the interactions between crabs and other species near hydrothermal vents