According to the theory of common descent, how should each species on Earth today compare?
A) They should look very similar to all other species.
B) They should not have ancestors in common with members of other species.
C) They should have a single ancestor in common.
D) They should have DNA that is mostly unique from other species.
C
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The F plasmid carries the information for
A. antibiotic resistance. B. recipient cell DNA replication. C. the Y chromosome. D. the sex pilus. E. antibiotic resistance AND the Y chromosome.
Scientist believe that the formation of organic polymers, like RNA and DNA, had to move from the watery environment of the seas to solid surfaces or evaporating tidal pools because
A. dehydration is necessary for the formation of large organic polymers, too much water competes with dehydration. B. hydrolysis is necessary for the formation of large organic polymers, dehydration competes with polymerization. C. tidal pools would provide a concentrated area where more small organic molecules could aggregate. D. Kusky discovered 1.43 billion year old fossils in shallow water and tidal pools. E. sugars dissolve in water, ribose is a sugar and is necessary for the polymerization of DNA and RNA therefore being out of the water would speed up the polymerization reactions.
Maintenance of the body's internal environment at relatively constant levels is called
a. feedback. b. homeostasis. c. physiology. d. natural selection. e. feedforward.
Why don't many successions reach the climax community status?
A. because the species within the system don't interact constantly B. because species go extinct C. because animals always die D. because the local climate keeps changing and human activities have an impact